MD Helicopters MDHI MD900 User manual

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
P/N
Issued: 8 April 2002
MD Helicopters, Inc.
5000 East McDowell Road
Mesa, Arizona 85215–9797
Copyright E1999−2003 by MD Helicopters, Inc.
All rights reserved under the copyright laws.
Cover/Title
Instructions for Continued Airworthiness
Airframe Fuel Filter
P/N: 900P5663200
MAINTENANCE INSTRUCTIONS AND ILLUSTRATED PARTS LIST
FOR
MODEL MD900)HELICOPTER

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
P/N
MD Helicopters, Inc.
5000 East McDowell Road
Mesa, Arizona 85215–9797
Copyright E1999−2003 by MD Helicopters, Inc.
All rights reserved under the copyright laws.
PROPRIETARY RIGHTS NOTICE
The technical data and information contained in this publication is the property of
and proprietary to MD Helicopters, Inc. and is not to be disclosed or reproduced in
whole or in part without the written consent of MD Helicopters, Inc.
RESTRICTED USE
MDHI provides this manual for use by owners, operators and maintainers of MDHI
products and authorized parts. Use by STC or PMA applicants or holders as
documentation to support their certificates is not an authorized use of this manual and
is prohibited. MDHI takes no responsibility for customer’s use of parts manufactured
under an STC or PMA when this manual is used as documentation with the Federal
Aviation Administration to justify the STC or PMA. Use of unauthorized parts on
MDHI products will void the MDHI warranty offered to the customer on components
and may void the warranty on the helicopter.

Page CRi
MD HELICOPTERS, INC.
TECHNICAL MANUAL RECOMMENDED CHANGE REPORT
This manual has been prepared and distributed by the Technical Publications Department and is
intended for use by personnel responsible for the maintenance of MDHI Helicopters. Periodic revision
of this manual will be made to incorporate the latest information. If, in the opinion of the reader, any
information has been omitted or requires clarification, please direct your comments to this office via
this form (or a duplicate). An endeavor will be made to include such information in future revisions.
MD Helicopters, Inc.
Bldg 615 M/S G048
4555 East McDowell Road
Mesa, AZ 85215–9734
Telephone: [phone]
Technical Publications Changes: (480) 346–6212; FAX: [phone]
Technical Publications Order Desk: (480) 346–6372, FAX: [phone]
Date:
Originator:
Address:
E–Mail:
Manual Title:
Chapter Title:
ATA Section Number:
Issue Date:
Revision No. and Date:
Page Number(s):
Paragraph Number(s):
Step Number(s):
Figure Number(s):
Table Number(s):
Remarks / Instructions:

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
900P5663200
Page CRii
Original
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MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
900P5663200
LOEP Page A
Original
LIST OF EFFECTIVE PAGES
INSERT LATEST CHANGE PAGES, DESTROY SUPERSEDED PAGES
The highest revision number indicates pages changed, added or removed by the current change.
Date of original and change pages are:
Original (Issue No. 0) 8 April 2002. . . . . . . . . .
Cover/Title
Cover/Tile Original. . . . . . . . . . . . . . . . . . . . . .
Change Report
CRi thru CRii NA. . . . . . . . . . . . . . . . . . .
List of Effective Pages
A and B Original. . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
i thru iv Original. . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
1 thru 4 Original. . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices
201 thru 222 Original. . . . . . . . . . . . . . . . . . . .
Illustrated Parts List
1001 thru 1008 Original. . . . . . . . . . . . . . . . .

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
900P5663200
Page B
Original LOEP
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MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
900P5663200
Page i
Original
Table of Contents
Cover/Title F−i. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Manual Recommended Change Report CRi. . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Effective Pages A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Purpose and Content of this Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Applicability 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1. Installation Configuration 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Proprietary Rights 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Publications 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Publication Distribution 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Related Publications 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. List Of Applicable Publications (LOAP) 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2. List Of Applicable Publications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D. Subscription Service 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E. MDHI Publications Revision Control 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F. List of Effective Pages (LOEP) 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G. Revision 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H. Reissues 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Access Methods 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Torque Practices 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Application of Warnings, Cautions and Notes 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Assistance 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. MDHI Field Service 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. MDHI Publications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Abbreviations 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Acronyms 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. Units of Measure 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Description and Operation 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Airframe Fuel Filter Block Diagram 202. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 202. Airframe Fuel Filter Installation 203. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Airframe Fuel Filter Operational Test 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 203. Press−To−Test And Caution Light 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Fuel Supply Vapor Shroud Leak Check/Pressure Test 205. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 204. Fuel Supply Vapor Shroud Leak Check/Pressure Test 206. . . . . . . . . . . .
4. Troubleshooting 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 201. Troubleshooting 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Diagram 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Electrical Diagram 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
900P5663200
Page ii
Original Table of Contents
Figure 205. Fuel Filter L Or R Caution Light Electrical Diagram 208. . . . . . . . . . . .
B. Wire Harness Locator 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Special Handling Procedures 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Application of Protective Treatments 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Installation Limitations 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Weight and Balance 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Placards and Markings 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 206. Placards And Marking 209. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Servicing 209. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. Cleaning 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12. Continued Airworthiness 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Airworthiness Limitations 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Overhaul Period 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Operational Checks 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D. Inspection Requirements 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E. Periodic Inspections 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F. Special Inspection − Calendar (1 YEAR) 211. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G. Conditional Inspection 211. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H. Repairs 211. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13. Airframe Fuel Filter Element 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Element Replacement 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14. Airframe Fuel Filter Drain Control 213. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Drain Control Removal 213. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Drain Control Installation 213. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 207. Airframe Fuel Filter Element 214. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15. Airframe Fuel Filter 215. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Airframe Fuel Filter Removal 215. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Airframe Fuel Filter Installation 215. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16. Airframe Fuel Filter Enclosure 216. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Enclosure Removal 216. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Enclosure Installation 216. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 208. Airframe Fuel Filter Assembly 217. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17. Inlet/Outlet Shrouds, Tubes, and Hoses 218. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Inlet/Outlet Shrouds, Tubes, and Hoses Removal 218. . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Inlet/Outlet Shrouds, Tubes, and Hoses Installation 219. . . . . . . . . . . . . . . . . . . . . . . .
Figure 209. Inlet/Outlet Shrouds, Tubes, And Hoses 221. . . . . . . . . . . . . . . . . . . . . . . .
18. Repair 222. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19. Special Tools and Consumable Materials 222. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Special Tools 222. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
900P5663200
Page iii/(iv blank)
Original
Table of Contents
B. Consumable Materials 222. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20. Storage Limitations 222. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Illustrated Parts List 1001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Scope 1001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Figure and Item Number 1001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Illustrated 1001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Part Number 1001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D. Description 1001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E. Quantity Per Assembly 1001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F. Used On 1002. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G. Serial Number 1002. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H. Notes 1002. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Standard Abbreviation Definitions 1002. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Standard Phrase Definitions 1002. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Illustrated Parts List 1002. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1001. Airframe Fuel Filter (Sheet 1 of 2) 1003. . . . . . . . . . . . . . . . . . . . . . . . . . . .

MD Helicopters Inc.
Optional Equipment Manual
900P5663200
CSP–900–S4
Airframe Fuel Filter
Page 1
Original
AIRFRAME FUEL FILTER
INTRODUCTION
1. Purpose and Content of this Manual
This Optional Equipment Manual describes
the Airframe Fuel Filter (900P566 200) for
the model MD900r helicopter.
This manual contains system descriptive and
operation information with instructions for
maintaining, inspecting and testing on a
periodic maintenance cycle to assure continued
airworthiness.
2. Applicability
(Ref. Table 1)
The airframe fuel filter system is applicable for
use on any MD900 (902 Config.) helicopter
with Pratt & Whitney 207E engines.
Table 1. Installation Configuration
Model Helicopter Installation
Configuration
Principal Features
MD900 (902 Configuration,
S/N 00077 and subsequent)
900P5663200–101 Two airframe fuel filters
3. Proprietary Rights
MD Helicopters, Inc. (MDHI) proprietary
rights are included in the information dis
closed herein. Recipient, by accepting this
document, agrees that neither this document
nor any part thereof shall be reproduced or
transferred to other documents or used or
disclosed to others for manufacturing or any
other purpose, except as specifically authorized
in writing by MD Helicopters, Inc. All rights
are reserved under the copyright laws by MD
Helicopters, Inc.
4. Publications
DExcept as modified by this rotorcraft
maintenance manual supplement, oper-
ation in compliance with the basic
MD900 Rotorcraft Maintenance Manual
(RMM) is mandatory.
The information presented in this supplement
is in addition to the information found in the
basic Rotorcraft Maintenance Manual (RMM).
This maintenance manual supplement must
be used with the basic RMM to assure safe
operation of the aircraft.
A. Publication Distribution
This manual is distributed to the end users (or
their mechanics or maintenance departments),
Repair Stations and other companies by
request only. At system installation, this
manual becomes part of the helicopter
permanent maintenance record.
B. Related Publications
This manual supplements the individual user
and maintenance manuals of the MD900
helicopter and system components. The
aircraft maintenance personnel should be in
possession of and refer to the manuals listed in
the List Of Applicable Publications (LOAP)
when performing aircraft maintenance
activities.
Whenever the installation or operation of this
equipment affects the operation of the basic
helicopter, appropriate mention of the affected
procedure, limitation, operation, will be
described in this supplement.
CAUTION

MD Helicopters Inc.
Optional Equipment Manual
900P5663200
CSP–900–S4
Airframe Fuel Filter
Page 2
Original
C. List Of Applicable Publications (LOAP)
(Ref. Table 2)
The List of Applicable Publications contains all
of the publications required to operate, inspect,
and perform maintenance on the Explorert.
This list gives the technical manual title, the
manual number, and the manufacturer and
their address.
Table 2. List Of Applicable Publications
MANUAL TITLE MANUAL NUMBER MANUFACTURER (1)
Standard Practices Manual CSP–SPM MDHI
4555 East McDowell Road
Mesa, Arizona 85215–9734 USA
www.mdhelicopters.com
Rotorcraft Maintenance Manual
Servicing And Maintenance
CSP–900RMM–2 MDHI
4555 East McDowell Road
Mesa, Arizona 85215–9734 USA
www.mdhelicopters.com
Rotorcraft Maintenance Manual
Instruments/Electrical/Avionics
CSP–900RMM–3 MDHI
4555 East McDowell Road
Mesa, Arizona 85215–9734 USA
NOTES:
(1) Publication must be kept and treated as part of the primary information file for the MD900 helicopter.
(2) Related Applicable Publications should be obtained from the manufacturer indicated.
D. Subscription Service
MDHI will maintain a list of MDHI publica
tion subscribers for any future changes to this
manual. New and revised MDHI publications
are available through a Subscription Service
from MDHI Publications.
Contact the appropriate manufacturer
indicated in the LOAP for related applicable
documents and revision service.
E. MDHI Publications Revision Control
To ensure the manual is complete and accu
rate, compare the existing revision to the
manual against a current Publications Index
to verify all changes have been posted to the
manual. Comparing the List of Effective
Pages (LOEP) for the latest change to the
individual pages of the manual will ensure the
manual is up to date.
To continue to provide current manual
information for limitations, procedures,
performance, etc., changes to the content of
the manual must be distributed and incorpo
rated into the operator’s manual. Changes or
revised information to MDHI manuals are
supplied using Revisions and Reissues.
F. List of Effective Pages (LOEP)
The manual contains a List of Effective Pages
(LOEP) so the operator may be assured at any
time that the manual is current. The LOEP
identifies each page individually by chapter/
section and page number and gives the date or
revision number of each page.
G. Revision
Changes to parts of the manual by the
replacement, addition, and/or deletion of pages
is done by revision. Each revision has a change
Transmittal Letter and LOEP attached. The
Transmittal Letter advises all manual holders
of pages to be removed and added by that
revision.
H. Reissues
Occasionally the manual may be reissued and
is identified as Reissue #1, Reissue #2, etc.
The preceding issue of the manual then

MD Helicopters Inc.
Optional Equipment Manual
900P5663200
CSP–900–S4
Airframe Fuel Filter
Page 3
Original
becomes obsolete and must be discarded. The
reissue includes all prior revisions. All pages in
a reissue become Original" pages. The reissue
may also include new or changed data.
5. Access Methods
Doors, covers, panels, and fairings are located
throughout the airframe to provide access for
inspection, maintenance, and servicing. Refer
to CSP−RMM−2 Chapter 06 for helicopter
access panel information.
6. Torque Practices
For a detailed list of standard torque values,
Refer to CSP−SPM, Section 20−10−00. Special
torque values are identified in the task.
7. Application of Warnings, Cautions and
Notes
Throughout this manual, Warnings, Cautions
and Notes are used to emphasize instructions
or information considered to be unusual or
critical. Caution and Warning statements will
always precede the information or instructions
to which they apply. A note can appear in text
before or after instructions to which it applies.
The conditions that warrant use of Notes,
Cautions and Warnings are given by the
subsequent.
Warnings call attention to use of
materials, processes, methods,
procedures, or limits which must be followed
precisely to avoid injury to persons.
Cautions call attention to use of
methods and procedures which
if not strictly monitored, can cause damage
or destruction of equipment.
NOTE: Notes call attention to methods which
make the job easier.
8. Assistance
Points of Contact at:
MD Helicopters, Inc.
4555 East McDowell Road
Mesa, Arizona 85215−97 4
A. MDHI Field Service
For technical assistance contact;
Field Service Department
VOICE: (480) 46−6 87
VOICE: (800) 88− 78
FAX: (480) 46−681
After hours:
VOICE: (480) 46−6 7
VOICE: (800) 88− 78
B. MDHI Publications
For publications assistance, contact;
Publications Order Desk
4555 East McDowell Road, M615
Mesa, Arizona 85215−97 4
VOICE: (480) 46−6 9 or
VOICE: (800) 88− 78
FAX: (480) 46−6809
www.mdhelicopers.com
(Current Publication Index on website)
9. Abbreviations
For abbreviations and definitions used
throughout this publication, refer to CSP−
SPM, Chapter 1.
10. Acronyms
MDHI MD Helicopters, Inc.
LOAP List of Applicable Publications
LOEP List of Effective Pages
RMM Rotorcraft Maintenance Manual
11. Units of Measure
psi pounds per square inch
ft.−lbs foot pounds
in.−lbs inch pounds
C degrees Celsius
F degrees Fahrenheit
WARNING
CAUTION

MD Helicopters Inc.
Optional Equipment Manual
900P5663200
CSP–900–S4
Airframe Fuel Filter
Page 4
Original
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MD Helicopters Inc.
Optional Equipment Manual
900P5663200
CSP–900–S4
Airframe Fuel Filter
Page 201
Original
AIRFRAME FUEL FILTER
MAINTENANCE PRACTICES
1. Description and Operation
(Ref. Figure 201)
The airframe fuel filter is a 10 micron, 500
square inch disposable filter element that
strips the fuel of solid contaminates prior to
entering the engine fuel s stem.
The left and right airframe fuel filters are
installed in the baggage compartment.
The airframe fuel filter is mounted in series
between the aircraft fuel s stem and the
engine fuel s stem.
A differential pressure sensing switch is
contained in the airframe fuel filter. When the
switch in the filter bod detects an increase in
the filter differential pressure due to partial or
complete filter blockage, the switch ma
intermittentl or completel close. Switch
contacts complete an electrical circuit that
turns on the FUEL FILTER L or R caution
light on the instrument panel. When the filter
becomes full clogged, a b −pass valve
contained in the airframe fuel filter opens and
the fuel b passes the filter element.
A press−to−test button is located on top of the
filter bod . Pressing the button will illuminate
the FUEL FILTER L or R caution light on
the instrument panel.
A filter bowl drain valve plumbed into the
drain manifold provides for filter draining and
fuel sampling.

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
Page 202
Original
VIEW LOOKING AFT
ENGINE DECK
RH FUEL FEED
VAPOR SHROUD
RH FUEL FEED SYS
VENT OVBD
DRAIN (2 PL)
FUEL CELL
LH FUEL FEED
VAPOR SHROUD
LH FUEL
FEED SYS
RIGHT
ENGINE
LEFT
ENGINE
AIRFRAME
FUEL FILTER (2 PL)
FUEL FILTER
DRAIN (2PL)
PRESS−TO−TEST
BUTON (2 PL)
S4−001
Figure 201. Airframe Fuel Filter Block Diagram

MD Helicopters Inc.
Optional Equipment Manual
900P5663200
CSP–900–S4
Airframe Fuel Filter
Page 203
Original
ELECTRICAL
CONNECTOR
FUEL FILTER
ENCLOSURE
DRAIN HOSE
LH FUEL FILTER
DRAIN HOSE
INLET HOSE
OUTLET HOSE
OUTBOARD VIEW
AIRFRAME FUEL
FILTER
INLET
OUTLET
DRAIN VALVE
DRAIN VALVE
PRESS TO TEST
BUTTON
S4−006
Figure 202. Airframe Fuel Filter Installation

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
Page 204
Original
2. Airframe Fuel Filter Operational Test
(Ref. Figure 203)
(1). Appl external power to the helicopter.
Set batter switch to EXT PWR.
(2). Press and hold, for 5 seconds, the
press−to−test button on top of airframe
filter. Ensure the applicable caution
light either FUEL FILTER L or R
comes on.
(3). Release the press−to−test button. Reset
caution light.
(4). Ensure the FUEL FILTER L or R
caution light goes off.
(5). Inspect fuel s stem for leaks (Ref
CSP−900RMM−2, Chapter 28).
LDG
LT
ELECTRICAL
CONNECTOR
FILTER
FUEL
LR
FUEL
XFER
FLOAT
ARM
PITOT
#1
APU
FUEL FILTER HOIST
20FTTEMP
L R #2
PRESS TO TEST
BUTTON
S4−007
Figure 203. Press–To–Test And Caution Light

MD Helicopters Inc.
Optional Equipment Manual
900P5663200
CSP–900–S4
Airframe Fuel Filter
Page 205
Original
3. Fuel Supply Vapor Shroud Leak
Check/Pressure Test
(Ref. Figure 204)
Consumable Materials
(Ref. CSP–SPM)
Item Nomenclature
C702 Lockwire
C809 Leak Detector, Liquid
Special Tools
(Ref. CSP–SPM)
Item Nomenclature
T2014–4 Manometer
T2014–5 Adapter
T2014–6 Regulator, Air Pressure
NOTE: This operational test is t pical for LH or
RH Fuel Vapor Shroud S stem. Repeat test
for the opposite side fuel vapor shroud s s
tem.
(1). Open upper and lower transmission
access door assembl L210 or R210
(Ref. CSP−900RMM−2, Section
06−00−00).
(2). Remove and discard lockwire and
disconnect vapor shroud duct (1. 50 ID
hose) from top of FMU vapor shroud
box. Plug vapor shroud box opening.
Helicopter must be defueled be
fore both floor panels AL165
and AR165 are removed. Structural damage
can occur if both of these panels are re
moved with fuel in the helicopter. Panel
AL165 or AR165 ma be removed individu
all without defueling helicopter.
(3). Remove cabin and baggage compart
ment floor access panels; AL165,
AR165, A235, AL250, AR250 (Ref.
CSP−900RMM−2, Section 53−20−00).
(4). Disconnect the left or right vapor
shroud drain hose from the engine
drain hose tee fitting.
(5). Plug the vapor shroud drain hose and
fuel filter drain hose.
(6). Appl and maintain a constant
0. 2 +0. 7 psig (1. 38 kPa) or 6 +2. 0
inches of water regulated air pres
sure to the left or right fuel cell frangi
ble valve outlet shroud drain hose (0.
250 inch ID rubber hose). With the
air pressure applied, the manometer
(T2014−4) shall indicate 6 +2. 0
inches of water.
(7). With air pressure applied, check for an
external leakage of the shrouds and
drains with liquid leak detector (C809).
Repair or replace as necessar and
retest.
(8). If test is successful, remove air source
from fuel cell frangible valve outlet
shroud drain hose.
(9). Unplug and reconnect left or right
vapor shroud drain hose to the engine
drain hose tee fitting.
(10). Unplug the fuel filter drain hose.
(11). Install cabin and baggage compartment
floor access panels; AL165, AR165,
A235, AL250, AR250 (Ref.
CSP−900RMM−2, Section 53−20−00).
(12). Connect vapor shroud duct to top of
FMU vapor shroud box. Secure vapor
shroud duct with lockwire (C702).
(13). Close upper and lower transmission
access door assembl L210 or R210
(Ref. CSP−900RMM−2, Section
06−00−00).
CAUTION

MD Helicopters Inc.
Optional Equipment Manual
CSP–900–S4
Airframe Fuel Filter
Page 206
Original
CAP, PLUG OR
CLAMP SHUT
APPLY AIR
PRESSURE
APPLY AIR
PRESSURE S4−003
CAP, PLUG OR
CLAMP SHUT
Figure 204. Fuel Supply Vapor Shroud Leak Check/Pressure Test