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ENSTROM TH-28/480 Series Maintenance Manual

Supplement 5 avionic systems
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ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL
Revision 18, dated Apr 30/2020, applies to the Enstrom TH-28/480 Series Maintenance Manual,
Supplement 5 Avionics Systems.
Remove and insert the pages listed below. Avoid unintentional removal of pages by following this
list carefully. Special instructions are denoted with asterisks where applicable.
Remove Pages
i through ii
v through viii *
xi through INTRO-2
1-1 through 1-2
2-1 through 2-2
3-1 through 3-2
5-1 through 5-2
6-1 through 6-2
6-5 through 6-8
None
7-1 through 7-2
8-1 through 8-2
9-13 through 9-14
11-1 through 11-8
11-15 through 11-26
*
Removal/Insertion of the Record of Revision page (page v) is unnecessary if Revision 18 date and
issue information is recorded.
..................................................... Continued on the Next Page .....................................................
SUPPLEMENT 5 AVIONIC SYSTEMS
Revision 18 Changed Pages
May 26, 2020
Insert Pages
i through ii
v through viii
xi through INTRO-2
1-1 through 1-2
2-1 through 2-2
3-1 through 3-2
5-1 through 5-2
6-1 through 6-2
6-5 through 6-8
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Summary of Contents for ENSTROM TH-28/480 Series

  • Page 1 SUPPLEMENT 5 AVIONIC SYSTEMS Revision 18 Changed Pages May 26, 2020 Revision 18, dated Apr 30/2020, applies to the Enstrom TH-28/480 Series Maintenance Manual, Supplement 5 Avionics Systems. Remove and insert the pages listed below. Avoid unintentional removal of pages by following this list carefully.
  • Page 2 ........... Continued from Previous Page ........... Remove Pages Insert Pages 11-33 through 12-2 11-33 through 12-2 13-1 through 13-2 13-1 through 13-2 14-1 through 14-2 14-1 through 14-2 15-1 through 15-2 15-1 through 15-2 16-7 through 16-10 16-7 through 16-10 17-5 through 17-6 17-5 through 17-6 17-11 through 17-12...
  • Page 3 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 AVIONIC SYSTEMS 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 4 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 INTENTIONALLY LEFT BLANK Rev. 8 Apr 27/12...
  • Page 5 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 RECORD OF REVISIONS ISSUE DATE REV NO. ISSUE DATE DATE INSERTED DATE INSERTED Nov 21/08 Nov 21/08 Mar 9/09 Mar 9/09 Jul 14/10 Jul 14/10 Nov 9/10 Nov 9/10 Jan 14/11 Jan 14/11...
  • Page 6 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 INTENTIONALLY LEFT BLANK Rev. 10 Jun 5/14...
  • Page 7 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 TABLE OF CONTENTS Chapter Description Page Cover Page ..................i Recommended Change Report ............iii Record of Revisions ................v Table of Contents ................vii Effective Page List ................ix Introduction Avionic System(s) Effectivity ..........INTRO-1 Aircraft Effectivity ..............

  • Page 8: Table Of Contents

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 TABLE OF CONTENTS Chapter Description Page Chapter 4 Mid-Continent Instruments MD200 Series CDI System Description ................. 4-1 Airworthiness Limitations ..............4-2 Servicing ..................4-3 Troubleshooting ................4-3 Periodic Inspections..............4-3 System Maintenance ............... 4-4 Electrical Diagram ................
  • Page 9 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 EFFECTIVE PAGE LIST Page Date Page Date Apr 30/2020 Aug 15/18 Apr 27/12 Aug 15/18 Aug 15/18 Aug 15/18 Jun 5/14 Aug 15/18 Apr 30/2020 Aug 15/18 Jun 5/14 May 7/19 Apr 30/2020...
  • Page 10 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 EFFECTIVE PAGE LIST Page Date Page Date May 1/13 11-15 Apr 30/2020 May 1/13 11-16 Apr 30/2020 May 1/13 11-17 Apr 30/2020 8-10 May 1/13 11-18 Apr 30/2020 8-11 May 1/13 11-19 Apr 30/2020...
  • Page 11 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 EFFECTIVE PAGE LIST Page Date Page Date 14-1 Dec 20/17 14-2 Apr 30/2020 14-3 Dec 20/17 14-4 Oct 20/15 14-5 Dec 20/17 14-6 Dec 20/17 14-7 Dec 20/17 14-8 Dec 20/17 14-9 Dec 20/17...
  • Page 12 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 INTENTIONALLY LEFT BLANK Rev. 14 Dec 20/17...
  • Page 13 SAE5-35 Altitude Data System 4220561-( ) 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. Supplemental Changes and Revisions A. Subsequent to the publication of the initial issue of this supplement, changes in the avionics equipment, support concepts and procedures, as well as information developed by experience may affect the contents of this supplement.
  • Page 14 Enstrom Helicopter website: www.enstromhelicopter.com (follow the applicable link under the Technical Publications section of the Technical Support page). Revision update notices are sent via email to owners and operators who are registered with Enstrom. Registration to receive publication mailing notifications can be coordinated through the Enstrom Technical Publications Administrator.
  • Page 15 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 1 TAS600 TRAFFIC ADVISORY SYSTEM SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The Avidyne Traffic Advisory System (TAS) is an Airborne Surveillance Radar system. The TAS600 uses transponder replies to compute bearing, relative altitude, and range from nearby Mode C- or Mode S-equipped aircraft.
  • Page 16 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 17 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 2 SL30 NAV COM SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The Garmin SL30 NAV/COM unit is a VHF Navigation/Communications Transceiver utilizing high performance Digital Signal Processing (DSP) filtering. It includes a 760-channel VHF Com transceiver and a 200-channel VOR/LOC/GS navigation receiver.
  • Page 18 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 19 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 3 SANDIA SAE5-35 ALTITUDE DATA SYSTEM SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The Sandia SAE5-35 is a solid state altitude data system (blind encoder) that converts pressure altitude into a digital output. The data output is referenced to 29.92 in Hg (1013 Millibars).
  • Page 20 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 21 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 5 POWERLINE DECTECTION SYSTEM SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The Powerline Detection System (PDS) was designed as an aid to helicopter pilots to alert them of their proximity to "live" power lines. The Safe Flight Powerline Detection System emits a pulsing, audible tone along with a visual alert.
  • Page 22 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 23 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 6 NAT AMS44 DUAL CHANNEL AUDIO CONTROLLER / NAT 247 AUDIO MIXING AMPLIFIER SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The NAT AMS44 Dual Channel Audio Controller provides one central controller for all aircraft audio, allowing selection of transmit and receive audio, LIVE, PTT (keyed), or VOX intercom, pilot isolation, and emergency operation.
  • Page 24 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 25 TH-28/480 Series Maintenance Manual, Section 6, Paragraphs 6-10 through 6-21. Refer to Diagram 6-1 for the NAT AMS44 electrical wiring interface. Refer to Diagram 6-2 for the NAT 247 electrical wiring interface.
  • Page 26 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Item Part Number Description Quantity AMS44 Dual Channel Audio Controller AMS44N Dual Channel Audio Controller - NVIS Dzus Fastener 7277-5-1 Circuit Breaker (1 Amp) Figure 5-1. NAT AMS44 Installation Rev. 5 Jan 14/11...
  • Page 27 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Item Part Number Description Quantity NAT 247 Audio Mixing Amplifier AN525-832R14 Screw 4220529-11 Spacer NAS1149FN816P Washer MS21044N08 D44SV-IKC Audio Mixing Amplifier Kit 7277-5-1 Circuit Breaker (1 Amp) Figure 5-2. NAT 247 Installation Rev. 18...
  • Page 28 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 INTENTIONALLY LEFT BLANK Rev. 5 Jan 14/11...
  • Page 29 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Diagram 6-3. AMS44 Audio Panel Wiring Schematic (4192524-7 Rev Q) Sheet 1 of 2 Apr 30/2020, Rev. 18 6-13/6-14 (Blank)
  • Page 31 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Diagram 6-3. AMS44 Audio Panel Wiring Schematic (4192524-7 Rev Q) Sheet 2 of 2 Apr 30/2020, Rev. 18 6-15/6-16 (Blank)
  • Page 33 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 7 ATTITUDE INDICATOR AND DIRECTIONAL GYRO SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The Attitude Indicator Installation, P/N 4220542-( ), provides an indication of the aircraft’s attitude relative to the earth by means of an electrically powered gyroscope. The unit is mounted in the instrument panel.
  • Page 34 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 35 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 8 GNS 430W/530W GPS/WAAS NAVIGATOR SECTION 1 SYSTEM DESCRIPTION 1-1. System Description The 430W/530W GPS/WAAS Navigator is a panel-mounted product that contains a GPS/WAAS receiver for GPS approved primary navigation under TSO C146a, and also VHF COM and VHF NAV radios in an integrated system unit with a moving map and color display.
  • Page 36 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. Airworthiness Limitations 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 37 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Diagram 9-2. GMA 350H (Standard) (Ref. 4192524-121 and 4192524-123 Rev. P) Apr 30/2020, Rev. 18 9-13/9-14 (Blank)

  • Page 39: System Description

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 11 GTN 650/750 GPS/NAV/COM SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The GTN 650 installation part numbers are 4220639-1, 4220639-3, and 4220639-5. The GTN 750 installation part number is 4220644-1. The differences are explained in the following...

  • Page 40: Airworthiness Limitations

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. Airworthiness Limitations A. For FAA approval, this 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 41: Servicing

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 3 SERVICING, TROUBLESHOOTING, AND PERIODIC INSPECTIONS 3-1. Servicing A. The GTN installation contains no user serviceable components or assemblies. Operations involving the removal of the GTN unit must be done by authorized maintenance technicians.

  • Page 42: System Maintenance

    (reference Enstrom TH-28/480 Series Maintenance Manual). 4-1. NOTE All work must be accomplished in accordance with the Enstrom TH-28/480 Series Maintenance Manual. 4-1-1. Cleaning A. The front bezel, keypad, and display can be cleaned with a microfiber cloth or with a soft cotton cloth dampened with clean water.
  • Page 43 21, Section 8.4. 4-2. Wiring Harnesses/Connectors A. Remove, inspect/repair, and install the airframe mounted wiring harnesses/ connectors in accordance with the TH-28/480 Series Maintenance Manual, Section 6, Paragraphs 6-10 through 6-21. 4-3. Figures and Diagrams A. Refer to Figures 11-1 and 11-2 and Table 11-3 GTN 650/750 for system installation information.
  • Page 44 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 DETAIL A Figure 11-1. GTN 650/750 Installation Rev. 18 11-6 Apr 30/2020...
  • Page 45 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 11-2. GTN 650/750 Installation – Aircraft on Ground Switch Table 11-3. GTN 650/750 Installation Item Part Number Description Quantity ▌ 4220639-1 GTN 650 Installation ▌ 4220639-3 GTN 650 Installation ▌ 4220639-5 GTN 650 Installation ▌...
  • Page 46 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Table 11-3. GTN 650/750 Installation Item Part Number Description Quantity 7277-5-5 (5 amp) . Circuit Breaker (NAV/GPS) ▌ 7277-5-5 (5 amp) . Circuit Breaker (GPS) (4220639-3 only) 7277-5-5 (5 amp) . Circuit Breaker (COM)
  • Page 47 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 11-5. GTN 650/750 Configuration Set-Up (P/N 4220639-1, P/N 4220639-5, or P/N 4220644-1; SW 6.41/SW 6.51) Sheet 1 of 3 (Ref. 4192539-9 Rev. H) Rev. 18, Apr 30/2020 11-15/11-16 (Blank)
  • Page 49 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 11-5. GTN 650/750 Configuration Set-Up (P/N 4220639-1, P/N 4220639-5, or P/N 4220644-1; SW 6.41/SW 6.51) Sheet 2 of 3 (Ref. 4192539-9 Rev. H) Rev. 18, Apr 30/2020 11-17/11-18 (Blank)
  • Page 51 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 11-5. GTN 650/750 Configuration Set-Up (P/N 4220639-1, P/N 4220639-5, or P/N 4220644-1; SW 6.41/SW 6.51) Sheet 3 of 3 (Ref. 4192539-9 Rev. H) Rev. 18, Apr 30/2020 11-19/11-20 (Blank)
  • Page 53 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 11-6. P/N 4220639-3 (Main SW 6.41/SW 6.51) Configuration Set-Up (Sheet 1 of 3) (Ref. 4192539-101 Rev. H) Rev. 18, Apr 30/2020 11-21/11-22 (Blank)
  • Page 55 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 11-6. P/N 4220639-3 (Main SW 6.41/SW 6.51) Configuration Set-Up (Sheet 2 of 3) (Ref. 4192539-101 Rev. H) Rev. 18, Apr 30/2020 11-23/11-24 (Blank)
  • Page 57 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 11-6. P/N 4220639-3 (Main SW 6.41/SW 6.51) Configuration Set-Up (Sheet 3 of 3) (Ref. 4192539-101 Rev. H) Rev. 18, Apr 30/2020 11-25/11-26 (Blank)
  • Page 59 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Diagram 11-4. GTN 650 (Main SW 6.41/SW 6.51) (Ref. 4192539-101 Rev. H) Rev. 18, Apr 30/2020 11-33/11-34 (Blank)
  • Page 61 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 12 GTX 327 TRANSPONDER SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The GTX 327 is a panel-mounted transponder with the addition of altitude reporting and timing functions. The transponder is a radio transmitter and receiver that operates on radar frequencies, receiving ground radar or TCAS interrogations at 1030 MHz and transmitting a coded response of pulses to ground-based radar on a frequency of 1090 MHz.
  • Page 62 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 63 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 12 SANDEL SN3500 EHSI SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The Sandel SN3500 is an enhanced electronic horizontal situation indicator (EHSI). It also functions as a secondary attitude indicator when the LED annunciator switch labeled ATTD IND is activated.
  • Page 64 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 65: System Description

    SYSTEM DESCRIPTION 1-1. System Description A. Enstrom P/N 4220517 provides for installation of the RA-4500 radar altimeter system. P/N 4220517-1, -3, and -5 installations consist of the radar altimeter receiver/transmitter, the RAD-40 radar altimeter display, and two antennas. P/N 4220517-3 and -5 installations include a tone generator to provide audio alerts via an interfaced audio panel.

  • Page 66: 2-1. Airworthiness Limitations

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 67: System Description

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 CHAPTER 15 APPAREO SYSTEMS VISION 1000 SECTION 1 SYSTEM DESCRIPTION 1-1. System Description A. The Vision 1000 is a data gathering system utilizing data from GPS, image capturing, flight attitude acquisition, and ambient and pilot headset audio recording with the intent to aid flight safety and analysis.

  • Page 68: Airworthiness Limitations

    ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 SECTION 2 AIRWORTHINESS LIMITATIONS 2-1. 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 69 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Item Part Number Component Quantity 4220645-5 GTX 345 Installation 010-01216-01 GTX 345 Kit 011-03302-00 . GTX 345 unit 7277-5-3 . Circuit Breaker 4220637-5 Antenna Installation AV-74-1 . Antenna . . Split Washer #8-32 .
  • Page 70 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 INTENTIONALLY LEFT BLANK Rev. 16 16-8 May 7/19...
  • Page 71 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Figure 16-2. GTX 345 Configuration (4192507-111J) Rev. 18, Apr 30/2020 16-9...
  • Page 72 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 INTENTIONALLY LEFT BLANK Rev. 16, May 7/19 16-10...
  • Page 73 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 4-2. Wiring Harnesses/Connectors A. Remove, inspect/repair, and install the airframe mounted wiring harnesses/ connectors in accordance with the TH-28/480 Series Maintenance Manual, Section 6, Paragraphs 6-10 through 6-21. 4-3. Figures and Diagrams A. GMA 350Hc installation parts list: Figure 17-1 and Figure 17-2.
  • Page 74 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Item Part Number Component Quantity 4220672-109 GMA 350Hc Audio Panel Installation with Marker Beacon Receiver 4220672-111 GMA 350Hc Audio Panel Installation without Marker Beacon Receiver 011-02385-50 . GMA 350Hc 011-02302-00 . Connector Kit (Included with GMA 350Hc) 7277-5-5 (5 amp) .
  • Page 75 ENSTROM TH-28/480 SERIES MAINTENANCE MANUAL SUPPLEMENT 5 Diagram 17-1. GMA 350Hc (Standard) (Ref. 4192524-121P and 4192524-123P) Apr 30/2020, Rev. 18 17-11/17-12 (Blank)

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