ENSTROM TH-28 Series Guide de configuration

Rev. 3

i Mar 21/16

ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL

SUPPLEMENT 2

EMERGENCY POP OUT FLOATS

The Airworthiness Limitations Section is FAA approved and specifies

inspections and other maintenance required under 14 CFR §§ 43.16 and

91.403 of the Federal Aviation Regulations unless an alternative program

has been FAA approved.

The Enstrom Helicopter Corporation

2209 22

Street

Menominee, Michigan 49858-3515

Telephone: 906-863-1200

Fax: 906-863-6821

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

ii Mar 21/16

INTENTIONALLY LEFT BLANK

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

iii Mar 21/16

RECOMMENDED CHANGE REPORT

This maintenance manual is prepared and distributed by The Enstrom Helicopter Corporation

and is intended for use by personnel responsible for maintaining Enstrom TH-28, 480, and 480B

helicopters. This manual is periodically revised. If, in the opinion of the user, any information has

been omitted or requires clarification, please direct your comments to Enstrom via this form

(duplicate) or other similar form. Send the recommended changes to:

The Enstrom Helicopter Corporation

2209 22nd Street

Menominee, MI 49858-3515

ATTN: Technical Publications

Manual Identification: Enstrom TH-28/480 Series Maintenance Manual Supplement 2

Manual Date: February 9, 2001

Revision Number and Date:

Aircraft Model:

Recommended Change:

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

iv Mar 21/16

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

v Mar 21/16

RECORD OF REVISIONS

REV

NO. ISSUE

DATE DATE

INSERTED BY REV NO. ISSUE

DATE DATE

INSERTED BY

3 Mar 21/16

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

vi Mar 21/16

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

vii Mar 21/16

TABLE OF CONTENTS

Paragraph Description Page

Cover Page ......................................................................................... i

Recommended Change Report..........................................................iii

Record of Revisions........................................................................... v

Table of Contents..............................................................................vii

Effective Page List..............................................................................ix

Section 1 Introduction

1-1. Aircraft Effectivity.............................................................................1-1

1-2. Supplemental Changes and Revisions ...........................................1-1

1-3. Application of Warnings, Cautions, and Notes................................1-1

Section 2 General Information

2-1. System Description .........................................................................2-1

2-2. Equipment and Consumables.........................................................2-2

2-3. Vendor Manuals..............................................................................2-3

Section 3 Airworthiness Limitations

3-1. Airworthiness Limitations.................................................................3-1

Section 4 Servicing, General Maintenance, Periodic Inspections, and

Recommended Overhaul Cycles

4-1. Servicing..........................................................................................4-1

4-2. Reservoir Cylinder...........................................................................4-1

4-3. General Maintenance......................................................................4-3

4-4. Testing.............................................................................................4-3

4-5. Testing Setup..................................................................................4-3

4-6. Float Pressure Test.........................................................................4-3

4-7. Topping-Off Valve Leakage Test.....................................................4-4

4-8. Pressure Relief Valve Test..............................................................4-5

4-9. Cleaning..........................................................................................4-5

4-10. Float Assembly...........................................................................4-5

4-11. Troubleshooting...............................................................................4-6

4-12. Periodic Inspections........................................................................4-6

4-13. Periodic Inspection Checklist ..........................................................4-7

4-14. Recommended Overhaul Cycles.....................................................4-8

Section 5 Component Maintenance

5-1. Float Assembly................................................................................5-1

5-2. Removal......................................................................................5-1

5-3. Inspection ...................................................................................5-1

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

viii Mar 21/16

TABLE OF CONTENTS

Paragraph Description Page

5-4. Repair.........................................................................................5-1

5-5. Valve Removal/Replacement .....................................................5-2

5-6. Cover Replacement....................................................................5-3

5-7. Installation...................................................................................5-5

5-8. Packing.......................................................................................5-5

5-9. Reservoir Cylinder...........................................................................5-6

5-10. Removal......................................................................................5-6

5-11. Inspection ...................................................................................5-6

5-12. Repair.........................................................................................5-6

5-13. Valve Overhaul...........................................................................5-7

5-14. Installation...................................................................................5-8

5-15. Activation Cable ............................................................................5-10

5-16. Removal....................................................................................5-10

5-17. Inspection .................................................................................5-10

5-18. Repair.......................................................................................5-10

5-19. Installation.................................................................................5-10

5-20. Hoses, Lines, and Fittings.............................................................5-12

5-21. Removal....................................................................................5-12

5-22. Inspection .................................................................................5-12

5-23. Repair.......................................................................................5-12

5-24. Installation.................................................................................5-12

5-25. Pylon Support Struts .....................................................................5-13

5-26. Removal....................................................................................5-13

5-27. Inspection .................................................................................5-13

5-28. Repair.......................................................................................5-14

5-29. Installation.................................................................................5-14

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

ix Mar 21/16

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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 2

Rev. 3

x Mar 21/16

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