AVSTAR LVC-3-3A Manual

AVStar Fuel Systems. All Rights Reserved.
Fuel System Operation &
Maintenance Manual
(Principal Manual)
Models LVC-3-3A, LVC-3-3PA, LVC-5-4PA, LVC-5-5BPA,
LVC-5-5PA, LHC-6-6BA and LHC-6-6BPA Carburetors
September 25, 2023
Part No. AFS-IOM-01

Fuel System Operation & Maintenance Manual
AVStar Part Number: AFS-IOM-01
Contact Us:
Mailing Address:
AVStar Fuel Systems
1365 Park Lane South
Jupiter, FL 33458 USA
Phone:
Factory
U.S. and Canada Toll Free:
Direct:
[phone]
[phone]
AVStar’s regular business hours are Monday through Friday from 8:00AM through 5:00PM
Eastern Time (-5 GMT).
Visit us Online: avstardirect.com

AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved Record of Revisions
September 25, 2023 Page i
RECORD OF REVISIONS
Revision
Revision
Date
Revised
By
Revision Description
Original
9/25/2023
CES
Original Release of Manual - Part No. AFS-IOM-01

AFS-IOM-01
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AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved Service Document List
September 25, 2023 Page iii
SERVICE DOCUMENT LIST
NOTICE: The following is a list of service documents referenced in, incorporated into, or
applicable to the information in this manual. Always refer to the latest revision of any
service document (including any supplements) for changes or additional information.
Document Number
Subject
AVStar AFS-IOM-01
Fuel System Operation & Maintenance Manual
(Principal Manual)
AVStar AFS-IPC-01
LVC-3-3 & LVC-5-4 Illustrated Parts Catalog
AVStar AFS-IPC-02
LVC-5-5 Illustrated Parts Catalog
AVStar AFS-IPC-03
LHC-6-6 Illustrated Parts Catalog
AVStar FSM LVC-S
LVC-3-3 & LVC-5-4 Overhaul Manual
AVStar FSM LVC-5-5
LVC-5-5 Overhaul Manual
AVStar FSM LHC-6-6
LHC-6-6 Overhaul Manual
AVStar AFS-SB7
Overhaul Periods for AVStar Carburetors
AVStar AFS-SB8
Carburetor Throttle Body to Bowl Retaining Screw
Inspection
AVStar AFS-SB14
New Fuel Nozzle for Guimbal Helicopters
AVStar AFS-SB15
LVC-5-5PA & LVC-5-5BPA AVStar Carburetors
Manufactured in 2011
Lycoming S.B. 398
Fuel, Recommendations Regarding Use of Incorrect
Lycoming S.I 1070
Specified Fuels for Spark Ignited Gasoline Aircraft
Engine Models
Lycoming S.I 1080
Maintenance Items for Special Attention
Lycoming S.I. 1002
Air Filters, Carburetor, Proper Maintenance
Lycoming S.I. 1009
Overhaul, Recommended Time Between (TBO)
Lycoming S.I. 1132
Magneto Drop-Off
Lycoming S.I. 1148
Carburetor Heat Control, Use of
Lycoming S.I. 1301
Primer and Fuel Injector Lines, Identification
Lycoming S.I. 1427
Engine Break-In and Oil Consumption Test Limits
Lycoming S.I. 1484
Carburetor or Fuel Injector Servo Unit Hold Down
Nuts, Installation Torque for Fuel Metering Device
Lycoming S.I. 1523
Carburetor Manufacturer’s Cross Referenced
Lycoming S.I. 1530
Engine Inspection in Particulate-Laden Environments
Lycoming S.L. L114
Engine and Accessory Maintenance Publications
Lycoming S.L. L247
Shelf Life Requirements
Lycoming S.L. L253
Warranty repair of AVStar Fuel System
Lycoming SSP-112-4
Service Bulletins Letters and Instructions
Lycoming SSP-1776-3
Service Table of Limits and Torque Value
Recommendations

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AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved Table of Contents
September 25, 2023 Page v
TABLE OF CONTENTS
Subject Page
Title Page _______________________________________________________________________
Record of Revisions.............................................................................................................................. i
Service Document List.......................................................................................................................iii
Table of Contents................................................................................................................................ v
List of Figures...................................................................................................................................viii
List of Tables ...................................................................................................................................... xi
Abbreviations and Acronyms .........................................................................................................xiii
Introduction....................................................................................................................................... xv
List of Applicable Part Numbers.................................................................................................... xvi
Airworthiness Limitations............................................................................................................. xxvi
Required Maintenance ................................................................................................. 05-00
—General..................................................................................................................................... 1
—Return to Service...................................................................................................................... 1
—Time Between Overhaul (TBO)............................................................................................... 1
—Safety Precautions - Before Maintenance................................................................................ 2
—Maintenance Practices.............................................................................................................. 2
Time Limits / Inspections............................................................................................. 05-10
—Carburetor Inspection Schedule............................................................................................... 4
Scheduled Maintenance Checks .................................................................................. 05-20
—Visual Inspection...................................................................................................................... 6
—10-Hour Initial Inspection........................................................................................................ 8
—25-Hour Initial Inspection......................................................................................................... 9
—50-Hour Inspection ................................................................................................................. 10
—100-Hour / Annual Inspection................................................................................................. 11
Cleaning ......................................................................................................................... 05-30
—Cleaning Guidelines................................................................................................................ 13
—Fuel Inlet Strainer.................................................................................................................... 13
Unscheduled Corrective Maintenance........................................................................ 05-50
—Incorrect Fuel or Fuel Contamination..................................................................................... 15
—Water Damage......................................................................................................................... 15

AFS-IOM-01
Table of Contents AVStar Fuel Systems. All Rights Reserved
Page vi September 25, 2023
—Engine or Carburetor on or Near a Fire .................................................................................. 15
—Volcanic Ash / Particulate Contamination.............................................................................. 16
—Hard Landing .......................................................................................................................... 16
Unscheduled Servicing.................................................................................................. 12-30
—Recommended Approach to Fault Isolation............................................................................ 18
—Fault Isolation Guide............................................................................................................... 18
Air Intake....................................................................................................................... 71-60
—Air Box and Carburetor Heat.................................................................................................. 23
Engine............................................................................................................................. 72-00
—Idle Speed & Mixture Adjustment.......................................................................................... 25
Engine Fuel System....................................................................................................... 73-10
—Carburetor Removal Prerequisites.......................................................................................... 27
—Carburetor Removal Procedure............................................................................................... 27
—Carburetor Installation Preparation Requirements & De-Preserving ..................................... 28
—Carburetor Installation ............................................................................................................ 28
—Carburetor Storage & Preservation......................................................................................... 29
Power Control ............................................................................................................... 76-10
—Throttle & Altitude Mixture Control ...................................................................................... 31
Appendix A....................................................................................................................
—Carburetor Fuel Pressure Limitations....................................................................................33
—Carburetor Model LVC-3-3PA & 5-4PA Features................................................................34
—Carburetor Model LVC-5-5BPA & 5PA Features ................................................................41
—Carburetor Model LHC-6-6BPA & BA Features..................................................................45

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AFS-IOM-01
List of Figures AVStar Fuel Systems. All Rights Reserved
Page viii September 25, 2023
LIST OF FIGURES
Fig. No.
Figure Title
Page
1
LVC-3-3A & LVC-3-3PA CARBURETORS
xvi
2
LVC-5-4PA CARBURETORS
xvii
3
LVC-5-5PA & LVC-5-5BPA CARBURETORS
xviii
4
LHC-6-6BPA & LHC-6-6BA CARBURETORS
xix
A-1
LVC-3-3PA FRONT VIEW
35
A-2
LVC-3-3PA TOP VIEW
35
A-3
LVC-3-3PA SECTION A-A
36
A-4
LVC-3-3PA SECTION B-B
36
A-5
LVC-3-3PA SECTION C-C
37
A-6
LVC-3-3PA VIEW D-D
37
A-7
LVC-5-4PA FRONT VIEW
38
A-8
LVC-5-4PA TOP VIEW
38
A-9
LVC-5-4PA SECTION E-E
39
A-10
LVC-5-4PA SECTION F-F
39
A-11
LVC-5-4PA VIEW G-G
40
A-12
LVC-5-5BPA FRONT VIEW
41
A-13
LVC-5-5BPA TOP VIEW
42
A-14
LVC-5-5BPA SIDE VIEW
42
A-15
LVC-5-5BPA SECTION H-H
43
A-16
LVC-5-5BPA SECTION J-J
43
A-17
LVC-5-5BPA VIEW K-K
44
A-18
LVC-5-5BPA SECTION L-L
44
A-19
LHC-6-6BPA TOP VIEW
45
A-20
LHC-6-6BPA SIDE VIEW
46
A-21
LHC-6-6BPA END VIEW
46
A-22
LHC-6-6BPA END VIEW
47
A-23
LHC-6-6BPA SECTION M-M
47
A-24
LHC-6-6BPA SECTION P-P
48
Continued on Next Page

AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved List of Figures
September 25, 2023 Page ix
Fig. No.
Figure Title
Page
A-25
LHC-6-6BPA SECTION R-R
48
A-26
LHC-6-6BPA SECTION T-T
49
A-27
LHC-6-6BPA SECTION U-U
49
A-28
LHC-6-6BPA SECTION V-V
50
A-29
LHC-6-6BPA SECTION W-W
50

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AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved List of Tables
September 25, 2023 Page xi
LIST OF TABLES
Table No.
Table Title
Page
1
Part Number Applicability
xvi
2
Fault Isolation Guide (Troubleshooting)
18
A-3
Carburetor Fuel Pressure Limitations
33

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AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved Abbreviations and Acronyms
September 25, 2023 Page xiii
ABBREVIATIONS AND ACRONYMS
C
CHT
Cylinder Head Temperature
F
FAA
Federal Aviation Administration
FAR
Federal Aviation (and Space) Regulation
FOD
Foreign Object Debris
G
GAMA
General Aviation Manufacturers Association
I
ICAs
Instructions for Continued Airworthiness
in-lbs.
Inch Pounds (torque)
IOM
Installation, Operation and Maintenance Manual
IPC
Illustrated Parts Catalog
L
lb.
Pound
M
MEK
Methyl-Ethyl-Ketone
O
OM
AFS-OM: AVStar Overhaul Manual
P
P/N
Part Number
psi
Pounds per square inch
S
SAE
Society of Automotive Engineers (oil viscosity)
SB
Service Bulletin
SI
Service Instruction
SL
Service Letter
T
TBO
Time Between Overhaul

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Abbreviations and Acronyms AVStar Fuel Systems. All Rights Reserved
Page xiv September 25, 2023
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AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved Introduction
September 25, 2023 Page xv
INTRODUCTION
The AVStar Carburetor Product Line consists of Models LVC-3-3A, LVC-3-3PA, LVC-5-4PA,
LHC-5-5BPA, LVC-5-5PA, LHC-6-6BA and LHC-6-6BPA. All carburetors are equipped with
Altitude Mixture Adjustment “A”, and those models designated with a “P” make use of an
accelerator pump. All are used on normally aspirated, horizontally opposed, air-cooled engines.
There are two LHC-6-6BA carburetors for use on turbocharged engines. Refer to the latest Revision
of Lycoming Service Instruction S.I. 1523 for a cross reference of applicable engines and Lycoming
Service Letter S.L. L114 for the applicable Parts Catalog, as well as any applicable data provided by
the Airframer.
To be used as a Reference Only, the table below identifies the applicable engine model(s) where
these carburetors are used. The table on the following page identifies the applicable Part Numbers
covered by this manual.
LYCOMING ENGINE MODELS
APPLICABLE
MODEL
O-235-C, -F, -H, -J, -K, -L, -M, -N, -P
LVC-3-3PA
O-235-K, -L
LVC-3-3A
O-320-A, -B, -D, -E. -H
O-360-J2A
LVC-5-4PA
O-360-A, -B, -C, -D
LVC-5-5BPA
O-540-A, -B, -E, -F, -G, -H, -J
LVC-5-5PA
O-320-D
O-360-A, -C, -F
O/LO-360-A
HO-360-C
O-540-J
LHC-6-6BPA
TO-360-C
TO/LTO-360-E
O-540-L
LHC-6-6BA

AFS-IOM-01
Introduction AVStar Fuel Systems. All Rights Reserved
Page xvi September 25, 2023
Table 1 - Part Number Applicability
APPLICABLE
P/N
APPLICABLE
MODEL
APPLICABLE
IPC
APPLICABLE
OVERHAUL MANUAL
AV10-5199
LVC-3-3A
AFS-IPC-01
FSM LVC-S
AV10-5050
LVC-3-3PA
AV10-5126
AV10-5142
AV10-5220
AV10-5257
AV10-5267
AV10-3678-32
LVC-5-4PA
AV10-4910-1
AV10-5009
AV10-5217
AV10-6110
AV10-6500
AV10-6500-1
AV10-3878
LVC-5-5BPA
AFS-IPC-02
FSM LVC-5-5
AV10-4164-1
AV10-5034
AV10-5193
AV10-5288
AV10-6054
AV10-6102
AV10-6108
AV10-4404
LVC-5-5PA
AV10-4404-1
AV10-5054
AV10-6035-11
AV10-5256-1
LHC-6-6BA
AFS-IPC-03
FSM LHC-6-6
AV10-5280-2
AV10-6001
AV10-5219
LHC-6-6BPA
AV10-5224
AV10-5230
AV10-5235
AV10-5253
AV10-5255
AV10-5283
AV10-6019
AV10-6019-1
AV10-6030-1

AFS-IOM-01
AVStar Fuel Systems. All Rights Reserved Introduction
September 25, 2023 Page xvii
Figure 1
LVC-3-3A & LVC-3-3PA Carburetors
Carburetor Model Nomenclature
The table below shows the definition of each letter and number.
Model Number
Meaning
L
Lycoming
V
Vertical/Bottom
C
FAA Certified
3
Flange Size
3
Bore Size
P
Accelerator Pump
A
Altitude Mixture

AFS-IOM-01
Introduction AVStar Fuel Systems. All Rights Reserved
Page xviii September 25, 2023
Figure 2
LVC-5-4PA Carburetors
Carburetor Model Nomenclature
The table below shows the definition of each letter and number.
Model Number
Meaning
L
Lycoming
V
Vertical/Bottom
C
FAA Certified
5
Flange Size
4
Bore Size
P
Accelerator Pump
A
Altitude Mixture