SERVICE INSTRUCTION M20-89B
Mooney M20A · Specifications
Overview
This document is a service instruction for the Mooney M20 series aircraft, specifically addressing the inspection of the Dukes landing gear actuator's rubber coupling. It outlines the procedures for inspecting and replacing the coupling to prevent potential landing gear collapse due to deterioration. The instructions are applicable to various models including M20C, M20E, M20F, M20G, and M20J, providing detailed steps for mechanics to follow during maintenance. The document emphasizes the importance of regular inspections and compliance with maintenance schedules to ensure safe operation of the aircraft's landing gear system.
- Inspect the Dukes rubber coupling every 200 hours or within the next 100 hours if not previously done.
- Use part number B100-06 for replacement of the rubber coupling if deterioration is found.
- Ensure the aircraft is on jacks before performing the inspection to keep landing gear off the ground.
- Follow the specific sequence of disassembly and reassembly to avoid damage to the actuator components.
- Document compliance in the logbook after completing the inspection and maintenance.
Document
Source
Originally published by mooney.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Specifications
- Year
- 1993
- Pages
- 1
- File size
- 7.8 KB
- Publisher
- mooney.com
Common. Rarer than 1% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Mooney M20A.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
Free — save the M20A to your watchlist and track it in one place.
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In this document
Introduction
The introduction highlights a report linking landing gear collapse during rollout to the deterioration of the rubber/metal coupling in Dukes landing gear actuators. It notes that aging may cause the rubber to harden or deteriorate, necessitating regular inspections.
Inspection Instructions
The document provides a step-by-step guide for inspecting the rubber coupling. It includes placing the aircraft on jacks, removing belly panels, and checking the coupling for wear or damage. Specific part numbers and assembly instructions are detailed to ensure proper maintenance.
Compliance and Maintenance
It specifies that inspections should coincide with every 200-hour gear backlash inspection. If the actuator is removed, landing gear rigging must be checked according to the service manual.
Parts List
A parts list is provided, detailing the coupling part number (B100-06) and quantity needed for replacement.
Safety notes
- Failure to inspect the rubber coupling may lead to landing gear collapse during landing.
- Ensure all operations are smooth and satisfactory before returning the aircraft to service.
Full document text
SERVICE INSTRUCTION M20-89B REV. B - DATE: February 20, 1993 SUBJECT: LANDING GEAR ACTUATOR, DUKES, RUBBER COUPLING INSPECTION. Revision B is prepared to correct actuator application. Dukes, P/N 4196-00-1C and 1057-00-5, are actuators affected. [ALSO ITT LA11C2110 ACTUATOR] MODEL/ S/N AFFECTED: ALL M20C, M20E, M20F, M20G WITH DUKES ELECTRIC LANDING GEAR ACTUATOR AND M20J’s, S/N 24-0001 THRU 24-0377. TIME OF WITH IN NEXT 100 HOURS AND TO COINCIDE WITH EVERY 200 HOUR GEAR BACK- COMPLIANCE: LASH INSPECTION THERE AFTER. INTRODUCTION: A report has been received that contributes a landing gear collapse, on landing roll out, to the possible de- terioration of the rubber/metal coupling, P/N B100-06, that couples the motor/gearbox assembly to the jackshaft/gearbox assembly of Dukes, P/N 4196-00-1C or 1057-00-5 landing gear actuators. The report states that age possibly could cause the rubber compound to harden or deteriorate. INSTRUCTIONS: 1. Place the aircraft on jacks so landing gear is off the ground. 2. Remove the belly panels to gain access to the landing gear actuator/motor assembly. 3. If this inspection is being accomplished along with the 200 hour gear backlash inspection per AD 75-23-04, SBM20-190A or the applicable Service and Maintenance manual, the sequence of cou- pling inspection is at the preference of the mechanic. Disconnect the two nuts/washers/bolts from the brackets holding motor/gearbox assembly to the jackshaft/gearbox assembly. If the inspection is only for the coupling, the actuator does not need to be removed from the aircraft. 4. Separate the motor/gearbox assembly from the jackshaft/gearbox assembly, being careful not to damage the disengage or cable mechanism. 5. Remove P/N B100-066 rubber/metal coupling from which ever shaft it remains attached to and in- spect it for deterioration, wear or damage. Replace with a new coupling if necessary. 6. Insert either shaft firmly into two of the serviceable coupling slots. 7. Position the motor/gearbox portion into place; carefully inserting the other shaft, 90o opposite the first shaft, into the other slots in the coupling. Position and secure the two bolts/washers/nuts to the bracket (in reverse order of removal) to re-assemble the components. 8. After completion of the gear backlash inspection and that maintenance, as necessary (if inspec- tions are being done at same time), check operation of the landing gear actuator assembly through several cycles to ensure all operations are smooth and satisfactory. 9. If no rod end bearing or retract tubes have been disconnected it is not necessary to check landing gear rigging unless this SI is being done in conjunction with a 100 hour or annual inspection. If the actuator has been removed from the aircraft it will be necessary to check landing gear rigging and operation per the applicable Service and Maintenance manual. 10. When all operations are found to be satisfactory per S & M manual re-install the belly skins, enter compliance note into log book and return aircraft to service. WARRANTY: Replacement couplings may be ordered from the Mooney Service Center (MSC) in your area. REFERENCE DATA: [SEE SB M20-189A AND SB M20-190A FOR OTHER INSPECTIONS] PARTS LIST: KIT PART NUMBER - SIM20-89-1 ITEM . P/N . . . . . DESCRIPTION . . . . . . . . QTY 1. . . B100-06 . . . . COUPLING . . . . . . . . . 1 FIGURE/ TABLES: N/A