MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
19
2006
Rev Date
At Annual Inspection:
1. Remove SpeedBrake per SpeedBrake Removal
instructions provided in earlier text this page.
2. Remove cover plate from SpeedBrake cartridge.
3. Clean and inspect unit for damage, corrosion,
looseness and proper operation.
4. Lubricate worm and worm gear (Aeroshell No. 22).
-- CAUTION --
Do not spray lubricants on SpeedBrakes. Dam-
age to cartridges and SpeedBrake clutch may
result.
5. Connect electrical plugs and reinstall cartridges
into each wing. Install screws and apply Loctite 242; re--
torque to 8 in. lbs.
Every 1000 hours:
1. Remove the SpeedBrake cartridges in accor-
dance with SECTION 27--96--01.
A. Return SpeedBrake cartridges to Precise Flight
Inc. for Clutch Spring and Drive Spring replacement.
B. Reinstall cartridges, when returned from Pre-
cise Flight Inc., into wings in accordance with SEC-
TION 27--96--01.
Every 5000 hours:
1. Remove the SpeedBrake cartridges in accor-
dance with SECTION 27--96--01.
A. Return SpeedBrake cartridges to Precise Flight
Inc. for Clutch Spring and Drive Spring replacement.
B. Reinstall cartridges, when returned from Pre-
cise Flight Inc., into wings in accordance with SEC-
TION 27--96--01.
27--96--03 TROUBLESHOOTING GUIDE
TROUBLE
PROBABLE CAUSE
SpeedBrake 2000
Cartridge Fails to Open
Check circuit breaker.
Check cannon plugs for security.
If SpeedBrake doors open, check that doors stop
approximately 1/4inch before being fully vertical.
There should be no gap between SpeedBrake doors.
If doors open beyond this position, contact Precise
Flight, Inc.
27--97--00 -- S--TEC AUTOPILOT ADJUSTMENT
(OPTIONAL)
For aircraft equipped with the optional S--TEC System
55X Autopilot system, certain flight characteristics
identified (as “porpoising” or “pitch pump”) may be en-
countered. Aircraft experiencing these motion charac-
teristics, during S--TEC Autopilot use, may require
Pitch Cable Tension adjustment.
The cable adjustment turnbuckle is located in the tail-
cone beneath the avionics rack. The cable tension is
factory set at 15 In. Lbs. +/-- 2. During normal aircraft
operation, the tension of the cable may diminish do to
temperature variations and cable stretch. Verify cable
tension and adjust to high side (17 In. Lbs.) if neces-
sary.
In addition, verify all S--TEC electrical connections are
secure. Partially connected harnesses may damage
connector pins and provide erroneous data.
Upon completion of adjustments, and prior to first flight,
a ground check to ensure proper and predictable sys-
tem operation must be performed. After ground check
is complete and any discrepancies corrected, a test
flight should be flown and in--flight adjustments made.
Refer to S--TEC documentation for detailed ground
check and flight adjustment procedures.
The Garmin G1000 Maintenance Manual should also
be referred to for additional calibration instructions re-
lated to the S--TEC Autopilot system.
27--97--01 -- GFC 700 AUTOPILOT (OPTIONAL)
The GSA 8X servo actuator is an electromechanical
unit that provides automatic control of a single flight
axis (pitch, roll, or yaw), or their associated trims. The
GSA 8X contains a motor--control and monitor circuit
board, as well as a solenoid and a brushless DC motor,
all enclosed in an extruded aluminum housing. Refer to
Mooney M20TN Service & Maintenance Manual Chap-
ter 22 for more detailed information.
The GSA 8X receives serial RS--485 data packets from
two GIA 6X units, which contain data from the flight di-
rector, the GRS 77 AHRS, and the GDC 74 Air Data
Computer. The motor--control board processes this in-
coming data and drives the brushless motor as neces-
sary to obtain the desired aircraft response. The mo-
nitor board independently monitors the servo speed,
monitors the output torque, and controls the engage-
ment of the drive--clutch solenoid.
The GSM 85(A) servo mount is mounted to the aircraft
structure, via a custom mounting bracket, and is re-
sponsible for transferring the output torque of the GSA
8X servo actuator to the mechanical flightcontrol sur-
face linkage.
Install a Circuit Breaker Placard labeled Trim Adapter
as indicated in FAA Advisory Circular
AC 43.13--2A, paragraph 27c(4).
AUGUST 2010
27--96--03
Summary of Contents for M20TN
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