SERVICE BULLETIN M20--288
Mooney M20D Master · Service Bulletins
Overview
This Service Bulletin M20-288, dated June 20, 2005, addresses issues related to alternator wiring specifically for Mooney aircraft equipped with factory-installed optional air conditioning. The bulletin outlines necessary modifications to alleviate heat buildup at the circuit breaker panel interconnect. It is intended for maintenance personnel and owners of affected Mooney models, specifically the M20M and M20R. Compliance is required at the next scheduled annual inspection or within the next 100 flight hours. The document provides detailed instructions for safely performing the modifications, including the removal and re-routing of specific wires, installation of new components, and proper documentation of the work performed.
- Affected models include Mooney M20M (S/N 27-0318 and 27-0326 to 27-0334) and Mooney M20R (S/N 29-0333 to 29-0378).
- Modifications must be completed at the next scheduled annual inspection or within 100 flight hours.
- The procedure involves turning off the master switch, removing the circuit breaker panel, and re-routing specific wires.
- A parts kit (M20-288-000) is required, including a 40-inch harness assembly and nylon grommet.
- Labor for the modifications is warranted for approximately 3 hours by Mooney Airplane Company.
Document
Source
Originally published by www.mooney.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 2005
- Pages
- 3
- File size
- 296 KB
- Publisher
- www.mooney.com
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In this document
Introduction
The introduction explains the purpose of the bulletin, which is to modify the wiring in Mooney aircraft with factory-installed optional air conditioning to prevent heat buildup at the circuit breaker panel. It emphasizes the importance of reading the entire procedure before starting the work.
Instructions
The instructions detail the step-by-step process for modifying the alternator wiring. Key steps include turning off the master switch, removing the circuit breaker panel, disconnecting specific wires, and re-routing them as specified. The procedure also includes notes on potential additional disassembly required to access the components.
Parts List
The parts list outlines the components required for the modification, including a nylon grommet, adhesive, and a specific harness assembly. It specifies the part numbers and quantities needed for the task.
Compliance
Compliance with this bulletin is required at the next scheduled annual inspection or within 100 flight hours. This ensures that the modifications are completed in a timely manner to maintain safety and performance.
Warranty
Mooney Airplane Company, Inc. offers a warranty for labor performed in accordance with this Service Bulletin, estimated at approximately 3 hours.
Safety notes
- Ensure the master switch is off before beginning any work on the electrical system.
- Follow all instructions carefully to avoid damaging components or creating safety hazards.
Full document text
MOONEY AIRPLANE COMPANY, INC. SERVICE BULLETIN Louis Schreiner Field Kerrville, Texas 78028 MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com THIS BULLETIN IS FAA APPROVED FOR ENGINEERING DESIGN SERVICE BULLETIN M20--288 Date: June 20, 2005 SUBJECT: ALTERNATOR WIRING MODELS/ SN ONLY AIRCRAFT WITH FACTORY INSTALLED “OPTIONAL” AIR CONDITIONING AFFECTED: MOONEY M20M, S/N 27-0318 and UNIT 27-0326 THRU 27-0334 MOONEY M20R, S/N 29-0333 THRU 29-0378 TIME OF AT NEXT SCHEDULED ANNUAL INSPECTION, BUT WITHIN NEXT 100 FLIGHT HOURS. COMPLIANCE: INTRODUCTION: This Bulletin is to rework Only aircraft with factory installed “Optional Air Conditioning” to alleviate heat build up at circuit breaker panel interconnect. INSTRUCTIONS: Read entire procedure before beginning work. 1. Turn master switch - OFF. 2. Remove & slide out Circuit Breaker Panel: A. Remove screws attaching glareshield and cover plate, carefully lift glareshield to expose wire disconnects for glareshield lights. Disconnect wires and lift glareshield off. B. Remove two screws from face of circuit breaker panel at upper right and left edges. C. Remove two screws from underneath, near edge of panel face. D. Panel should now be free to slide aft approximately 4--5 inches. This will allow access to plumbing and electrical connections. NOTE: In some instances, components, other than the one to be removed, must be removed or at least some wiring or plumbing disconnected to gain access to the desired component. 3. Locate and remove wire number PA10D02 from alternator “Out” Circuit Breaker #BR90 (ref. Figure SB M20-288-1). 4. Locate and remove wire number PB11E06 (Ammeter Shunt) (ref. Figure SB M20-288-1). 5. Remove existing hardware at tray assembly, and discard (ref. Figure SB M20-288-1) 6. Locate and move jumper wire number PA12E02 and 20 AWG jumper wire [annotated “(REG SENSE BREAKER) JUMPER”] in figures SB M20--288--1 and SB M20--288--2 from bottom of circuit breaker #BR90 (ref. fig SB M20--288--2). 7. Route wire PA10D02 (from RF Filter) on top of 800407 Tray Assembly to Alternator “Out” circuit breaker #BR90 (ref. Figure SB M20-288-2). 8. Route wire #PB11D06 (from Firewall #3) through the .75 hole in 340306 bracket. Install nylon “caterpillar” grommet (Cut to fit), and secure with 3M 8001 adhesive (ref. Figure SB M20-288-2). NOTE: In some installations, the above wires may need re-routing to gain the required length for connections. If harness PA10D02 has insufficient length to reach circuit breaker, use harness PA10D02 supplied with kit. Route PA10D02 wire harness to the specified location. Use tie wraps TYB23M as required. 9. Install Circuit Breaker Panel back in reverse order as in #2 procedure above. 10. Turn master switch - ON. 11. Complete log book entry. 12. Return aircraft to service. WARRANTY: Mooney Airplane Company, Inc. will warrant labor (approximately 3 hours) when done in accordance with procedures of this Service Bulletin. REFERENCE Applicable MAC Service and Maintenance Manuals (Electrical Panels & Components) DATA: Chapter 39 MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com PARTS LIST: Mooney Airplane Company, Inc., Parts Kit M20-288-000 Item P/N Description Qty 1. MS21266-IN Nylon grommet material (Cut to fit) AR 2. 8001 3M 8001 super weather strip adhesive AR 3. PA10D02 Harness Assembly (40 inch length) 1 4. TYB23M Wrap, Tie AR FIGURES/TABLES: Remove and Discard Hardware LH RH Tray Assembly Ammeter Shunt “WAS” Schematic Diagram: MOVE JUMPER FROM BOTTOM TO TOP OF CIRCUIT BREAKER (FROM BAT BUS) PA12E02 (REG SENSE BREAKER) JUMPER PA10D02 (FROM RF FILTER) PB11D06 (FROM FIREWALL #3) REMOVE WIRE REMOVE HDW AT 800407 TRAY (RIGHT SIDE) REMOVE HDW AT 800407 TRAY (LEFT SIDE) REMOVE WIRE Figure SB M20-288-1 MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com Route Wire PB11D06 Through .75 Hole to (--) side of Ammeter Shunt “IS” Schematic Diagram: Add Nylon Grommet MS21266--IN and Secure with 3M 8001 Adhesive ROUTE WIRE ON TOP OF 800407 TRAY ASSY TO ALTERNATOR OUT CIRCUIT BREAKER. Note: If old PA10D02 has insufficient length to comply with this procedure, use the New harness PA10D02 (40 inch) supplied with the kit. MOVE JUMPER FROM BOTTOM TO TOP OF CIRCUIT BREAKER (REG SENSE BREAKER) JUMPER (FROM BAT BUS) PA12E02 PA10D02 (FROM RF FILTER) PB11D06 (FROM FIREWALL #3) ROUTE WIRE THROUGH .75 HOLE IN 340306 BRACKET. INSTALL CATERPILLAR GROMMET. SECURE WITH 3M 8001 ADHESIVE. Figure SB M20-288-2