ENSTROM TH-480 Series Supplement Manual
  1. Manuals
  2. Brands
  3. ENSTROM Manuals
  4. Toy
  5. TH-480 Series
  6. Supplement manual

ENSTROM TH-480 Series Supplement Manual

Hide thumbs Also See for TH-480 Series:
Table of Contents

Advertisement

Quick Links

ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL
ENSTROM 480/480B AIR CONDITIONING SYSTEM
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.
This manual supplement supersedes all previous editions of the TH-28/480 Maintenance
Manual Supplement 1 originally dated November 26, 1996.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED
Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
SUPPLEMENT 1
P/N 4220176-( )
Copyright 2011, 2017 by
The Enstrom Helicopter Corporation
nd
2209 22
Street
Menominee, Michigan 49858-3515
http://enstromhelicopter.com/
Telephone: 906-863-1200
Fax: 906-863-6821
i
Rev. 8
May 1/17

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the TH-480 Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for ENSTROM TH-480 Series

Summary of Contents for ENSTROM TH-480 Series

  • Page 1 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 ENSTROM 480/480B AIR CONDITIONING SYSTEM P/N 4220176-( ) 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.

  • Page 2: Enstrom Th-28/480 Series Maintenance Manual Supplement

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.

  • Page 3: 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.
  • Page 4 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.

  • Page 5: Table Of Contents

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 TABLE OF CONTENTS Paragraph Description Page Cover Page ..................... i Recommended Change Report ..............iii Table of Contents ................... v Effective Page List ..................vii Section 1 Introduction 1-1. Aircraft Effectivity ..................1-1 1-2.
  • Page 6 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 7 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 EFFECTIVE PAGE LIST Page Date Page Date May 1/17 May 1/17 May 1/17 May 1/17 May 1/17 May 1/17 May 1/17 viii May 1/17 May 1/17 May 1/17 Dec 3/10 Dec 3/10 May 1/17...
  • Page 8 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 viii May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.

  • Page 9: Introduction

    1-1. Aircraft Effectivity A. The data presented in this TH-28/480 Series Maintenance Manual Supplement is applicable to all Enstrom 480 and 480B model helicopters equipped with the optional air conditioning system, Part Numbers 4222176-1, 4220176-2, 4220176-3, 4220176-5, 4220176-6, or 4220176-7.

  • Page 10: Application Of Warnings, Cautions, And Notes

    Tech Publications section of the website. Enstrom distributes maintenance manual supplement reissues and revisions in hardcopy form via mail to owners and operators who are registered with Enstrom. Notice of recently released Service Information Letters and Service Directive Bulletins is provided via a postcard mailing.

  • Page 11: General Information

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 SECTION 2 GENERAL INFORMATION 2-1. System Description A. The air conditioning system, Part Number 4220176, is a vapor cycle type air conditioner consisting of a compressor, condenser, receiver/drier bottle, by-pass valve, two (4220176-1, -3, -5 or -7) or three (4220176-2 or -6) evaporator assemblies, plumbing, and electrical control equipment.

  • Page 12: Safety Precautions

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 G. The plumbing used in this air conditioning system consists of aluminum hard lines, medium pressure rubber flex lines, "B" nut pressure fittings, unions, and tees. Servicing ports are located on the left side of the aircraft above the aft crosstube. Plumbing schematic diagrams (A-1, A-2, and A-3) are located in the back of this supplement.

  • Page 13: Equipment And Consumables

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 C. It is important to keep the system tightly sealed because the refrigerant system is always under pressure. Heat applied to any part of the refrigerant system would cause the pressure to build up excessively.

  • Page 14: Suggested Spares List

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 NOTE Refer to the "Log Record Sheets" provided with the aircraft and/or the maintenance records for the aircraft to determine the brand/type of lubricating oil used to service the air conditioning system. 2) Lubricating Oil:...
  • Page 15 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Figure 2-1. Air Conditioning System – General Arrangement UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 16 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Part Number Component Quantity Code‡ Air Conditioning System Installation 4220176-1 (Two Forward Evaporators) Air Conditioning System Installation 4220176-2 (Two Forward Evaporators, One Aft Evaporator) Air Conditioning System Installation 4220176-3 (One Forward Evaporator, One Aft Evaporator)
  • Page 17 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Sheet 2 of 3 Figure 2-1. Air Conditioning System – General Arrangement UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 18 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Sheet 3 of 3 Figure 2-1. Air Conditioning System – General Arrangement UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 19 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Figure 2-2. Compressor Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 20 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Part Number Component Quantity Item 4130531-3 H-Strut Weldment 4220175-1 . Bracket NAS144DH-12 . . Bolt MS20002C4 . . Washer AN3-5 . . Bolt AN960-10L . . Washer S-3008EC-6 . Compressor M81934/1-C014 . . Bushing 4220175-23 .

  • Page 21: Airworthiness Limitations

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 SECTION 3 AIRWORTHINESS LIMITATIONS 3-1. Airworthiness Limitations A. 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.
  • Page 22 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.

  • Page 23: Lubrication, Servicing, Troubleshooting, And Periodic Inspections Lubrication

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 SECTION 4 LUBRICATION, SERVICING, TROUBLESHOOTING, AND PERIODIC INSPECTIONS 4-1. Lubrication WARNING This air conditioning system should only be serviced by qualified personnel. A. The total system oil charge is 7.4 ± .5 oz. (219 ± 15 ml). The compressor is charged at the factory with 3.4 oz.
  • Page 24 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 B. Turn on the vacuum pump and open both valves on the service manifold to evacuate the system. NOTE When the pressure drops to 29.40 in Hg. (-1 bar) moisture vaporizes and is drawn out of the system. Complete removal of moisture is important to prevent blockage of the expansion valves by ice.

  • Page 25: Troubleshooting

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 4-3. Troubleshooting A. Prior to troubleshooting a defective system, conduct a visual inspection for general condition. Inspect the condenser fins for damage, comb out bent fins. Check the system circuit breakers located in the center pedestal.
  • Page 26 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Table 4-2. System Troubleshooting Guide Problem Cause Solution Premature belt failure or a. Belt loose a. Install new belt/adjust belt slipping off the tension pulley b. System over charged b. Adjust system charge c.

  • Page 27: Periodic Inspections

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 4-4. Periodic Inspections A. The following inspection checklist is intended as a guide for 100 hour/annual inspections for aircraft operating under normal conditions. More frequent inspections may be required should adverse operating conditions be encountered.
  • Page 28 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.

  • Page 29: System Maintenance

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 SECTION 5 SYSTEM MAINTENANCE 5-1. Belt Replacement and Adjustment, Pulley Alignment A. Replace the compressor drive belt using the following procedure. NOTE Refer to the TH-28/480 Series Maintenance Manual for maintenance procedures related to the airframe and/or aircraft systems.
  • Page 30 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 NOTE Refer to the air conditioning supplement in the applicable Rotorcraft Flight Manual. B. Proper compressor drive belt tension is important to insure long belt service life. Use the following procedure to set the belt tension.
  • Page 31 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 2) If a gap is present between the compressor pulley and the tool, shim at locations A or B with AN960616L washers, as required. To add shims, remove the nuts on the lower compressor support rod. Remove rod and spacers and add shims. Ensure that the spacers are positioned properly when reassembling (longer spacer is forward and the shorter spacer is aft) (Refer to Figure 5-2).
  • Page 32 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 Figure 5-2. Pulley Alignment Tool Position, Shim Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 May 1/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.

  • Page 33: Refrigerant Fitting Installation

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 5-2. Refrigerant Fitting Installation A. Two types of refrigerant plumbing fittings are used in the air conditioning system. The first is an "Insert O-ring Fitting". The location of this type of fitting is marked by this symbol "●"...

  • Page 34: Leak Check

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 C. Install the "Face Seal O-ring Fitting" as follows: NOTE The O-rings used with the "Face Seal O-ring Fitting" are black in color. 1) Apply a light coat of refrigerant oil to the O-ring and install the O-ring into the female fitting.

  • Page 35: Uncontrolled Copy When Downloaded Or Printed Rev

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 A-1. Plumbing Schematic Diagram – Two Evaporator System (Two Forward), P/N 4220176-1 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 Jun 14/11 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 36 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 A-2. Plumbing Schematic Diagram – Three Evaporator System (Two Forward, One Aft), P/N 4220176-2 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 Jun 14/11 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 37 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 A-3. Plumbing Schematic Diagram – Two Evaporator, Litter Compatible System (One Forward, One Aft), P/N 4220176-3 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 Jun 14/11 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 38 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 3 Sep 12/08 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 39 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 B-1. Electrical Schematic Diagram – Two Evaporator System (Two Forward), P/N 4220176-1 or 4220176-5 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 Dec 3/10 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 40 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 B-2. Electrical Schematic Diagram – Three Evaporator System (Two Forward, One Aft), P/N 4220176-2 or 4220176-6 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 Dec 3/10 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 41 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 B-3. Electrical Schematic Diagram – Transient Suppression Circuitry UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 Dec 3/10 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
  • Page 42 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 1 B-4. Electrical Schematic Diagram – Two Evaporator, Litter Compatible System (One Forward, One Aft), P/N 4220176-3 or 4220176-7 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 Dec 3/10 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.

This manual is also suitable for:

Th-480bTh-28Th-28 series

Table of Contents