Robinson Helicopter Company RTR 660 User manual

SEP 2012 R66 Maintenance Manual Introduction Page i
Type Certificate Number R00015LA
Robinson Helicopter Company Phone: [phone]
2901 Airport Drive Fax: [phone]
Torrance, California 90505-6115 Web: www.robinsonheli.com
UNITED STATES
OFFICE HOURS
Monday through Friday, 7:30 a.m. to 4:30 p.m., Pacific Time.
Lunch hour is 11:30 a.m. to 12:30 p.m.
HOLIDAYS
Please visit www.robinsonheli.com, under the Customer Support tab,
for a complete list of holidays and company shutdowns.
CUSTOMER SUPPORT AND ORDERS
Please visit www.robinsonheli.com, under the Customer Support tab,
for a complete service directory.
Procure parts from any R66 Dealer or Service Center, or order directly
from assigned RHC Customer Service Representative via email, fax, or phone.
PUBLICATIONS
Please visit www.robinsonheli.com, under the Publications tab,
to view our publications electronically.

Page ii Introduction R66 Maintenance Manual SEP 2012
SUBSCRIPTION SERVICE FORM
Name: Phone:
Address: Fax:
Email:
I Own R22 Serial Number(s):
I Own R44/R44 II Serial Number(s):
I Own R66 Serial Number(s):
Covers updates during the subscription period only. Requests for revisions produced before the subscription period are subject
to an additional charge at the full subscription rate for each past year requested.
MODEL/CLASS DESCRIPTION PRICE/YR. QTY. TOTAL
R22
A Future updates to R22 Pilot’s Operating Handbook & Safety Notices $15.00
B Future updates to R22 Pilot’s Operating Handbook & Safety Notices, R22 Service
Bulletins & Service Letters $25.00
C Future updates to R22 Pilot’s Operating Handbook & Safety Notices, R22 Service
Bulletins, Service Letters, & R22 Maintenance Manual/Parts Catalog revisions $35.00
R44
Q Future updates to R44 Pilot’s Operating Handbook & Safety Notices $15.00
R Future updates to R44 Pilot’s Operating Handbook & Safety Notices, R44 Service
Bulletins & Service Letters $25.00
S Future updates to R44 Pilot’s Operating Handbook & Safety Notices, R44 Service
Bulletins, Service Letters, & R44 Maintenance Manual/Parts Catalog revisions $35.00
R44 II
V Future updates to R44 II Pilot’s Operating Handbook & Safety Notices $15.00
W Future updates to R44 II Pilot’s Operating Handbook & Safety Notices, R44 Service
Bulletins & Service Letters $25.00
X Future updates to R44 II Pilot’s Operating Handbook & Safety Notices, R44 Service
Bulletins, Service Letters, & R44 Maintenance Manual/Parts Catalog revisions $35.00
R66
J Future updates to R66 Pilot’s Operating Handbook & Safety Notices $15.00
K Future updates to R66 Pilot’s Operating Handbook & Safety Notices, R66 Service
Bulletins & Service Letters $25.00
L Future updates to R66 Pilot’s Operating Handbook & Safety Notices, R66 Service
Bulletins, Service Letters, & R66 Maintenance Manual/Parts Catalog revisions $35.00
Method of Payment: No cash or CODs. We cannot be responsible for cash sent by mail. For faster processing, order online.
U.S. Check, Money Order, payable to Robinson Helicopter Company
Wire Transfer (subscription will not take effect until wire transfer has been received)
VISA, MasterCard or American Express
Credit Card Number: Month / Year:
Cardholder Signature: Verification Code:
Billing Zip:
Return to: ROBINSON HELICOPTER COMPANY Attn: Subscriptions
2901 Airport Drive, Torrance, CA 90505 Fax: [phone]

SEP 2012 R66 Maintenance Manual Introduction Page iii
CHAPTER LIST
Introduction
Chapter 1 General
Chapter 4 Airworthiness Limitations
Chapter 5 Inspection Schedule
Chapter 6 Dimensions and Descriptions
Chapter 7 Jacking and Hoisting
Chapter 8 Weight and Balance
Chapter 9 Ground Handling
Chapter 10 Parking and Storage
Chapter 11 Placards and Markings
Chapter 12 Servicing
Chapter 18 Track and Balance
Chapter 20 Standard Practices
Chapter 21 Environment Control
Chapter 25 Furnishings
Chapter 28 Fuel System
Chapter 32 Landing Gear
Chapter 52 Doors and Windows
Chapter 53 Fuselage
Chapter 62 Main Rotor
Chapter 63 Main Rotor Drive System
Chapter 64 Tail Rotor
Chapter 65 Tail Rotor Drive System
Chapter 67 Flight Controls
Chapter 71 Powerplant
Chapter 75 Engine Air Systems
Chapter 76 Engine Controls
Chapter 79 Engine Oil System
Chapter 95 Instrument System
Chapter 96 Electrical System
Chapter 98 Wiring Diagrams
Chapter 99 Special Tools
Chapter 100 Revision Log

Page iv Introduction R66 Maintenance Manual SEP 2012
TECHNICAL PUBLICATIONS
RECOMMENDED CHANGE REPORT
Please direct recommended changes to RHC Technical Publications via the email address listed below, by phone,
or by submitting a duplicate of this completed form by fax or mail. Please include or have available the information
detailed by this form.
Recommended changes may include but are not limited to: general comments, corrections, omitted information,
or clarification of instructions.
Please send recommendations to:
Email: [email protected] Robinson Helicopter Company
Attention: Technical Publications
2901 Airport Drive
Torrance, CA 90505-6115
UNITED STATES
Phone: [phone]
Fax: [phone]
Date: Publication:
Name: Chapter:
Company: Section:
Helicopter Model: Page:
Serial Number: Revision:
Phone:
Email:
COMMENTS:

SEP 2012 R66 Maintenance Manual Introduction Page v
LIMITED AIRCRAFT WARRANTY
Effective R66 Serial Number 0003 & on
Robinson Helicopter Company, Inc. (hereafter referred to as RHC) warrants each new helicopter to be free
from defects in material and workmanship appearing within two years from the date of delivery from the RHC
factory or during the rst one thousand (1000) hours of operation, whichever event occurs rst; provided, the
aircraft has been subjected to normal use and service. This Warranty is limited to repair or replacement on an
exchange basis, as selected by RHC, of any part, which upon examination by RHC is deemed to have been
defective when the aircraft left the factory. A new warranty period is not established for parts replaced under
the terms of this Warranty. Such replacement parts are warranted only for the remainder of the original war-
ranty period. This Warranty shall not apply to any helicopter or part which has been repaired or altered out-
side the factory, and which, in RHC’s judgment, has affected the performance or reliability of the helicopter
or part. This Warranty shall not apply to any helicopter or part which has been subject to corrosion, misuse,
negligence or accident, nor to any parts normally replaced during routine maintenance, such as, air cleaners,
skid shoes, rod end or spherical bearings, light bulbs, etc. This Warranty shall not apply to any helicopter,
which has been crated for shipping unless such crating is performed by RHC. RHC is not responsible for the
cost of shipping parts under the terms of this Warranty. However, RHC will credit the RHC Dealership, which
sold and delivered the new helicopter to its original owner, with an allowance for labor performed by that
Dealership for removing and reinstalling the defective part. No credit will be issued for trouble-shooting.
RHC makes no Warranty with respect to batteries, instruments, avionics or other trade accessories since
they are usually warranted separately by their respective manufacturers. New aircraft are equipped with new
engines which have a separate Rolls Royce limited warranty.
ADDITIONAL WARRANTY FOR MAIN & TAIL GEARBOXES
In addition to the warranty specied above, an extended pro-rated warranty shall apply to the main and tail
gearboxes for the rst 2000 hours of service or three years from the date of manufacture, whichever event
occurs rst. During this period, if a gearbox must be overhauled due to failure of a part which was defective
when it left the factory, RHC will pro-rate the cost of the overhaul by dividing the hours in service by 2000
or the months in service by thirty-six (36), whichever fraction is greater.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS GIVEN AND ACCEPTED IN LIEU OF
ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS, EXPRESS, IMPLIED, OR
STATUTORY, WHETHER WRITTEN OR ORAL, INCLUDING WITHOUT LIMITATION ANY
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
TRADE USAGE, THE REMEDIES OF THE BUYER SHALL BE LIMITED TO THOSE PROVIDED
HEREIN. IN NO EVENT WILL THE MANUFACTURER BE LIABLE FOR LOSSES RESULTING
FROM LOSS OF USE OF THE HELICOPTER, COLLATERAL, CONSEQUENTIAL OR SPECIAL
DAMAGES, OR ANY OTHER COSTS.
Warranty adjustments with respect to any helicopter or parts manufactured by RHC will be made only upon
compliance with the following procedure:
(1) The defective part or assembly, together with a written Warranty Claim, must be returned to RHC not
later than thirty (30) days after discovery of the defect nor more than thirty (30) days after expiration
of the Warranty period.
(2) RHC will, after inspection, determine whether the material or part was defective when it left the
factory and will respond accordingly. Final determination of a Warranty adjustment rests with RHC.
ROBINSON HELICOPTER COMPANY, INC.
2901 Airport Drive
Effective 1 June 2010 Torrance, California 90505 U.S.A.

Intentionally Blank
Page vi Introduction R66 Maintenance Manual SEP 2012

CONTENTS
INTRODUCTION
Section Title Page
— Cover Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
— Subscription Service Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
— Chapter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
— Recommended Change Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
— Limited Aircraft Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
— Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
CHAPTER 1 — GENERAL
Section Title Page
1-10 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1
1-20 R66 Maintenance Manual Revisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1
1-30 R66 Maintenance Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1
1-40 R66 Component Overhaul Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1
1-50 Notations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2
1-60 Definitions and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2
1-70 Service Directory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4
1-80 Assembly Instructions for R66 Helicopter Crated for Export . . . . . . . . . . . . . . . 1.5
CHAPTER 4 — AIRWORTHINESS LIMITATIONS
Section Title Page
4-10 Airworthiness Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1
4-20 Type Certificate Data Sheet (TCDS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3
CHAPTER 5 — INSPECTION SCHEDULE
Section Title Page
5-10 Life-Limited Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1
5-11 Time In Service Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1
5-12 Retirement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1
5-20 Scheduled Maintenance and Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3
5-30 Standard Inspection Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5
5-31 Ball and Roller Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5
5-32 Push-Pull Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5
5-33 Rod Ends and Spherical Bearings . . . . . . . . . . . . . . . . . . . . . . . . 5.5
5-34 Elastomeric Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7
5-35 Telatemp Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7
5-40 Operation Checks for 100-hour / Annual Maintenance and Inspection . . . . . . . . 5.8
5-41 Ground Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.8
5-42 Run-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.10
5-43 Flight Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.11
5-45 100-Hour / Annual Maintenance and Inspection . . . . . . . . . . . . . . . . . . . . . . . . 5.13
5-50 2000-Hour Maintenance and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.36B
5-55 12-Year Maintenance and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.36D
5-60 Special Maintenance and Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.37
SEP 2012 R66 Maintenance Manual Introduction Page vii

CONTENTS
CHAPTER 5 — INSPECTION SCHEDULE (Continued)
Section Title Page
5-61 Tail Skid Strike . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.37
5-62 Tail Rotor Strike . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.38
5-63 Main Rotor Strike . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.39
5-64 Rotor/Engine Overspeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.40
5-65 Hard Landing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.41
5-66 Dye Penetrant Inspection of F020-1 Upper Frame . . . . . . . . . . . . . 5.42
5-67 Corrosion on F020-1 Upper Frame . . . . . . . . . . . . . . . . . . . . . . . . 5.42
5-68 Main Rotor Gearbox Overtemp Illumination . . . . . . . . . . . . . . . . . 5.42
5-69 Main Rotor Gearbox (MR) Chip Light Illumination . . . . . . . . . . . . . 5.43
5-70 Tail Rotor Gearbox (TR) Chip Light Illumination . . . . . . . . . . . . . . . 5.43
5-71 Main Rotor Gearbox Filter Bypass Indicator . . . . . . . . . . . . . . . . . 5.43
CHAPTER 6 — DIMENSIONS AND DESCRIPTIONS
Section Title Page
6-10 Version Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1
6-20 Datum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1
6-30 Method of Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1
6-40 External Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3
6-50 Baggage Compartment Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4
6-60 Station Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6
6-61 Fuselage Station (FS) Locations . . . . . . . . . . . . . . . . . . . . . . . . . 6.6
6-62 Tailcone Station (TS) Locations . . . . . . . . . . . . . . . . . . . . . . . . . 6.7
6-63 Water Line (WL) Station Locations . . . . . . . . . . . . . . . . . . . . . . . 6.8
6-64 Butt Line (BL) Station Locations . . . . . . . . . . . . . . . . . . . . . . . . . 6.9
6-70 Access and Inspection Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.11
6-80 Antenna Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.12
CHAPTER 7 — JACKING AND HOISTING
Section Title Page
7-10 Jacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1
7-20 Hoisting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5
CHAPTER 8 — WEIGHT AND BALANCE
Section Title Page
8-10 Leveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1
8-11 Leveling for Weight and Balance . . . . . . . . . . . . . . . . . . . . . . . . 8.1
8-12 Leveling for Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3
8-20 Weighing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5
8-21 Preparing Helicopter for Weighing . . . . . . . . . . . . . . . . . . . . . . . 8.5
8-22 Weighing Procedure and Calculations . . . . . . . . . . . . . . . . . . . . . 8.7
8-30 Fixed Ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.11
8-31 Nose Ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.11
8-32 Empennage Ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.13
Page viii Introduction R66 Maintenance Manual SEP 2012

CONTENTS
CHAPTER 9 — GROUND HANDLING
Section Title Page
9-10 Ground Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1
9-11 Ground Handling Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1
9-12 Moving Helicopter on Ground Handling Wheels . . . . . . . . . . . . . . 9.3
9-13 Ground Handling Carts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.3
9-14 Ground Power Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.3
9-20 Trailering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.4
CHAPTER 10 — PARKING AND STORAGE
Section Title Page
10-10 Parking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.1
10-11 Parking in High Wind or Turbulent Air . . . . . . . . . . . . . . . . . . . . . 10.1
10-12 Main Rotor Blade Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.3
10-13 Main Rotor Blade Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.5
10-20 Storage (Greater than 30 days) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.6
CHAPTER 11 — PLACARDS AND MARKINGS
Section Title Page
11-10 Placard Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1
11-20 Placard Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3
CHAPTER 12 — SERVICING
Section Title Page
12-10 Main Rotor Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1
12-11 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1
12-12 Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.3
12-13 Chip Detector and Sight Gage . . . . . . . . . . . . . . . . . . . . . . . . . . 12.3
12-20 Tail Rotor Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.7
12-21 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.7
12-22 Chip Detector and Sight Gage . . . . . . . . . . . . . . . . . . . . . . . . . . 12.8
12-23 Drain and Flush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.8
12-30 Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.9
12-31 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.9
12-32 Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.9
12-33 Drain and Flush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.11
12-34 Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.12
12-40 Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.13
12-41 Fueling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.13
12-42 Defueling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.13
12-50 Main Rotor Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.15
12-51 Filling Spindle Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.15
12-60 Engine Oil Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.16
12-70 (Engine) Compressor Rinse and Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.17
SEP 2012 R66 Maintenance Manual Introduction Page ix

CONTENTS
CHAPTER 12 — SERVICING (Continued)
Section Title Page
12-80 Air Conditioning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.18
12-81 Refrigerant Recovery and System Charging . . . . . . . . . . . . . . . . . 12.18
12-82 Desiccant Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.19
12-83 Leak Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.19
CHAPTER 18 — TRACK AND BALANCE
Section Title Page
18-10 Main Rotor Track and Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1
18-11 Preparing Helicopter for Main Rotor Track and Balance . . . . . . . . . 18.3
18-12 Flight Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.5
18-13 Track Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.7
18-14 Balance Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.10
18-15 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.11
18-16 Autorotational RPM Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 18.12
18-20 Tail Rotor Dynamic Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.17
18-21 Preparing Helicopter for Tail Rotor Dynamic Balance . . . . . . . . . . . 18.17
18-22 Ground Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.19
18-23 Balance Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.19
18-30 Main Rotor Flight Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.21
18-40 Main Rotor Blade Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.23
18-41 Cyclic Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.24
18-42 Collective Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.26
18-50 Tail Rotor Flight Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-51 Pedals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-52 Forward Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-53 Intermediate Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-60 Tail Rotor Blade Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.29
CHAPTER 20 — STANDARD PRACTICES
Section Title Page
20-10 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.1
20-20 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.2
20-30 Torque Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.3
20-31 Torque Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.5
20-32 Standard Torques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.6
20-33 Special Torques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.7
20-34 Push-Pull Tube Rod End Adjustment . . . . . . . . . . . . . . . . . . 20.11
20-40 Non-Destructive Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.12
20-41 Magnetic Particle Inspection . . . . . . . . . . . . . . . . . . . . . . . 20.12
20-42 Fluorescent Penetrant Inspection . . . . . . . . . . . . . . . . . . . . 20.13
20-50 Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.13
20-60 Priming and Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.13
20-70 Approved Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.16
20-71 Paint Strippers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.16
20-72 Solvents and Cleaners . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.16
20-73 Fillers and Putty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.17
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CHAPTER 20 — STANDARD PRACTICES (Continued)
Section Title Page
20-74 Torque Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.17
20-75 Primers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.17
20-76 Powder Coat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.18
20-77 Paints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.19
20-78 Lubricants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.22
20-79 Adhesives and Sealants . . . . . . . . . . . . . . . . . . . . . . . . . . 20.23
20-80 Storage Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.24
20-90 Miscellaneous Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.25
20-91 Part Interchangeability . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.25
20-92 Thermal Fitting Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.26
20-93 Replacement Component Identification (Data) Plates . . . . . . 20.26
CHAPTER 21 — ENVIRONMENT CONTROL
Section Title Page
21-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.1
21-10 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3
21-11 Nose Vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3
21-20 Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.5
21-21 Compressor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.5
21-22 Condenser and Fan Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . 21.7
21-23 Evaporator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.8
21-24 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.9
21-30 Cabin Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.11
21-31 Valve Assembly and Control Rigging . . . . . . . . . . . . . . . . . . . . . . 21.11
21-32 Muffler Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.12
21-33 Diffuser and Tee Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.12
CHAPTER 25 — FURNISHINGS
Section Title Page
25-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.1
25-10 Seat Harnesses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.3
25-11 Seat Harness Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.3
25-12 Seat Harness Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.4
25-20 Seat Assemblies and Back Rests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5
25-21 Seat Assembly Removal and Installation . . . . . . . . . . . . . . . . . . . 25.5
25-22 Back Rest Assembly Removal and Installation . . . . . . . . . . . . . . . 25.5
25-23 Back Rest Cushion Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 25.5
25-30 Carpet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.7
25-40 Insulation (Foam and Headliner) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.8
25-50 General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.8
25-51 Pilot's Operating Handbook (POH) Strap Replacement . . . . . . . . . . 25.8
25-52 License Holder Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.9
25-53 Map Pocket Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.9
25-60 Emergency Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.10
25-61 Emergency Locator Transmitter (ELT) . . . . . . . . . . . . . . . . . . . . . 25.10
25-62 Fire Extinguisher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.11
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CHAPTER 28 — FUEL SYSTEM
Section Title Page
28-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.1
28-10 Bladder Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.3
28-11 Roll-Over Vent Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.6
28-12 Sump Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.6
28-20 Fuel Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.7
28-21 Fuel Quantity Sender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.7
28-22 Low-Fuel Switch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.8
28-30 Fuel Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.11
28-31 Fuel Valve Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.11
28-40 Fuel Flow Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.12
CHAPTER 32 — LANDING GEAR
Section Title Page
32-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.1
32-10 Landing Gear Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.1
32-20 Cross Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.5
32-30 Skid Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.7
32-31 Skid Shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.8
32-32 Skid Extension Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.8
32-33 Ground Handling Wheel Support Replacement . . . . . . . . . . . . . . . 32.8
32-40 Fairing Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.9
32-50 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.9
32-60 Pop-Out Floats Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.11
32-61 Cylinder Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.11
32-62 Lever Rigging and Shear-Rivet Replacement . . . . . . . . . . . . . . . . . 32.17
32-63 Float Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.19
32-64 System Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.22
CHAPTER 52 — DOORS AND WINDOWS
Section Title Page
52-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.1
52-10 Door Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.1
52-11 Door Lock Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.4
52-12 Weather Seal (Door Assembly) Replacement . . . . . . . . . . . . . . . . 52.4
52-13 Gas Springs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.7
52-20 Door Vent Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.7
52-21 Weather Seal (Door Vent) Replacement . . . . . . . . . . . . . . . . . . . . 52.7
52-22 Door Vent Hinge Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 52.8
52-23 Pivot Friction Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.8
52-30 Windshield Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.11
CHAPTER 53 — FUSELAGE
Section Title Page
53-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.1
53-10 Cabin Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.1
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CHAPTER 53 — FUSELAGE (Continued)
Section Title Page
53-11 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.1
53-20 Fairing, Cowlings, and Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.3
53-21 Engine Cowling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.3
53-22 Mast Fairing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.3
53-23 Tailcone Cowling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.4
53-24 Access and Inspection Panels . . . . . . . . . . . . . . . . . . . . . . . . . . 53.4
53-30 Frame Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.5
53-31 Lower Frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.5
53-32 Hydraulic Servo Support Frame . . . . . . . . . . . . . . . . . . . . . . . . . 53.9
53-33 Upper Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.10
53-40 Tailcone Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.13
53-41 Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.15
53-50 Empennage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.17
53-51 Vertical Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.17
53-52 Horizontal Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.19
53-53 Tail Rotor Guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.21
53-54 Tail Skid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.22
CHAPTER 62 — MAIN ROTOR
Section Title Page
62-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.1
62-10 Main Rotor Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.1
62-11 Blade Boots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.6
62-20 Main Rotor Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.7
62-21 Bearing Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.9
62-30 Main Rotor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.11
62-31 Journal and Shim Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . 62.11
62-32 Adjusting Hinge Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.15
62-33 Drilling Nuts and Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.17
62-40 Inspection of Main Rotor Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.19
62-41 Scratches and Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.19
62-42 Dents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.21
62-43 Spar Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.23
62-44 Root Fitting Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.23
62-45 Nicks and Notches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.23
62-46 Voids and Debonds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.25
62-50 Repair of Main Rotor Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.27
62-51 Sealing, Filling, and Fairing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.27
62-52 Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.28
CHAPTER 63 — MAIN ROTOR DRIVE SYSTEM
Section Title Page
63-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.1
63-10 Engine Shaft Weldment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.1
63-11 (Engine Driveline) Forward Flex Plate Shimming . . . . . . . . . . . . . . 63.2
63-12 Clutch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.5
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CHAPTER 63 — MAIN ROTOR DRIVE SYSTEM (Continued)
Section Title Page
63-20 Main Rotor Gearbox Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.6
63-21 Yoke and Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.8
63-30 Rotor Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.11
63-31 Pad Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.12
63-40 Rotor RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.12
CHAPTER 64 — TAIL ROTOR
Section Title Page
64-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.1
64-10 Tail Rotor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.1
64-11 Static Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.5
64-20 Tail Rotor Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.8
64-30 Tail Rotor Blade Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.9
64-31 Scratches and Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.9
64-32 Dents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.9
64-33 Erosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.11
64-34 Root Fitting Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.11
64-35 Nicks and Notches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.11
64-36 Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.11
64-40 Tail Rotor Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.13
64-41 Bearing Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.13
64-42 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.13
CHAPTER 65 — TAIL ROTOR DRIVE SYSTEM
Section Title Page
65-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.1
65-10 Tail Rotor Drive Fan Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.1
65-20 Tail Rotor Drive Shaft Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.3
65-21 Runout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.5
65-22 Damper Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.7
65-30 (Tail Rotor Driveline) Intermediate Flex Plate Shimming . . . . . . . . . . . . . . . . . . . 65.8
65-40 Tail Rotor Gearbox Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.10
65-41 Output Shaft Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 65.11
65-42 Input Shaft Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 65.12
CHAPTER 67 — FLIGHT CONTROLS
Section Title Page
67-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.1
67-10 Cyclic Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.1
67-11 Cyclic Control Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.1
67-12 Cyclic Grip Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.4
67-13 Cyclic Friction Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.6
67-20 Collective Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.6
67-21 Collective Stick Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.6
67-22 Collective Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.8
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CONTENTS
CHAPTER 67 — FLIGHT CONTROLS (Continued)
Section Title Page
67-30 Jackshaft and Strut Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.8
67-31 Jackshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.8
67-40 Swashplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.9
67-41 Swashplate Tilting Friction Adjustment . . . . . . . . . . . . . . . . . . . . 67.11
67-42 Upper and Lower Scissor Assemblies . . . . . . . . . . . . . . . . . . . . . 67.11
67-50 Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.13
67-51 Hydraulic Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.13
67-52 Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.14
67-53 Hydraulic Servos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.15B
67-60 Tail Rotor Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.19
67-61 Pedals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.19
67-62 Pitch Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.20
67-70 Bellcranks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.21
67-71 C317-5 Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.21
67-72 C317-7 Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.22
67-73 F316-1 Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.22
67-74 A331-4 Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.23
67-75 A120-5 Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.24
CHAPTER 71 — POWERPLANT
Section Title Page
71-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.1
71-10 Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.3
71-11 Preparing Engine for Rolls-Royce Maintenance Facility . . . . . . . . . 71.6
71-12 Preparing Engine for Helicopter Installation . . . . . . . . . . . . . . . . . 71.7
71-20 Induction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.11
71-21 Air Filter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.11
71-22 Cage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.12
71-23 Engine Inlet Bellmouth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.12
71-30 Exhaust Weldment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.15
71-40 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.16
71-41 Starter-Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.16
71-42 Generator Control Unit (GCU) . . . . . . . . . . . . . . . . . . . . . . . . . . 71.16
71-43 Engine Monitoring Unit (EMU) . . . . . . . . . . . . . . . . . . . . . . . . . . 71.17
CHAPTER 75 — ENGINE AIR SYSTEMS
Section Title Page
75-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75.1
75-10 Engine Anti-Ice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75.1
CHAPTER 76 — ENGINE CONTROLS
Section Title Page
76-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.1
76-10 Fuel Control Unit (FCU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.1
76-11 FCU Throttle Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.3
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CONTENTS
CHAPTER 76 — ENGINE CONTROLS (Continued)
Section Title Page
76-12 FCU Fuel Cutoff Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . 76.3
76-20 Power Turbine Governor (PTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.5
76-21 PTG Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.5
76-22 PTG Rigging Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.7
CHAPTER 79 — ENGINE OIL SYSTEM
Section Title Page
79-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.1
79-10 Scroll and Fanwheel Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.3
79-11 Fanwheel-to-Inlet Gaps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.3
79-20 Oil Tank Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.5
79-21 Oil Temperature Sender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.6
79-22 Sight Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.7
79-30 Engine Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.7
79-40 Engine Oil Line Assemblies and Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.8
CHAPTER 95 — INSTRUMENT SYSTEM
Section Title Page
95-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1
95-10 Pitot-Static System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.3
95-20 Primary Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.5
95-21 Vertical Speed Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.5
95-22 Airspeed Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.5
95-23 Engine (N2) and Rotor Dual Tachometer . . . . . . . . . . . . . . . . . . . 95.5
95-24 Altimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.5
95-25 Torquemeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6
95-26 Magnetic Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6
95-30 Engine Gages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6
95-31 N1 Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6
95-32 Measured Gas (Turbine) Temperature (MGT) Gage . . . . . . . . . . . . 95.6
95-33 Engine Oil Pressure Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6
95-34 Engine Oil Temperature Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6
95-35 Fuel Quantity Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.6
95-40 Additional Standard Indicating Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.7
95-41 Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.7
95-42 Ammeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.7
95-43 Outside Air Temperature (OAT) Gage/Voltmeter . . . . . . . . . . . . . . 95.7
95-44 Hourmeters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.7
95-50 Instrument Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.7
95-60 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.7
CHAPTER 96 — ELECTRICAL SYSTEM
Section Title Page
96-00 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.1
96-10 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.2
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CONTENTS
CHAPTER 96 — ELECTRICAL SYSTEM (Continued)
Section Title Page
96-20 External Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.5
96-30 Starter and Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.5
96-40 Lighting System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.6
96-50 Annunciator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.6
96-60 Low Rotor RPM Warning Unit Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.7
96-70 Audio System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.7
96-80 Engine Monitoring Unit (EMU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.8
96-90 Emergency Locator Transmitter (ELT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.8
96-100 Electrical Load Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96.9
CHAPTER 98 — WIRING DIAGRAMS
Figure Title Page
98-1 R66 Electrical System (F024 Revision I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.1
98-2 R66 Electrical System (F024 Revision G) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.2
98-3 Air Conditioning Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.3
98-4 ADF Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.5
98-5 Standard Audio System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.7
98-6 Dual Audio Control Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.9
98-7 PA/Siren Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.11
CHAPTER 99 — SPECIAL TOOLS
Section Title Page
99-10 Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.1
99-20 Illustrations and Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.3
CHAPTER 100 — REVISION LOG
Section Title Page
— Revision Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100.1
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SEP 2012 R66 Maintenance Manual Chapter 1 General Page 1.i
CHAPTER 1
GENERAL
Section Title Page
1-10 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1
1-20 R66 Maintenance Manual Revisions . . . . . . . . . . . . . . . . . . . . . . . 1.1
1-30 R66 Maintenance Authorization . . . . . . . . . . . . . . . . . . . . . . . . . 1.1
1-40 R66 Component Overhaul Authorization . . . . . . . . . . . . . . . . . . . . 1.1
1-50 Notations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2
1-60 Definitions and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2
1-70 Service Directory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4
1-80 Assembly Instructions for R66 Helicopter Crated for Export . . . . . . 1.5

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