Gsm 85(A) Slip-Clutch Setting Procedure - Garmin GSA 8X Installation Manual

3.3

GSM 85(A) Slip-Clutch Setting Procedure

3.3.1 Introduction
This procedure gives the steps for setting the GSM 85(A) slip-clutch break-away torque values. This
procedure requires the use of the Garmin Slip-Clutch Fixture, P/N T10-00110-01, described in Section
2.3.3. This procedure may be performed using either a sprocket or pulley type servo gearbox, equipment
for both methods is provided with the Garmin Slip-Clutch Fixture. The GSM 85(A) Universal Hub (P/N
011-00894-09) unit uses a sprocket (P/N 380-00015-20) provided with the Garmin Slip-Clutch Fixture to
complete this procedure.
The installer must only use aircraft-specific slip-clutch adjustment values during this
procedure. This is a sample procedure provided to give an overview of the clutch setting
method recommended by Garmin. Always refer to aircraft-specific procedures that are
approved by the aircraft manufacturer or by Garmin.
Prior to performing the slip-clutch procedure, remove and discard the warning tag located
on the servo gearbox that indicates that the clutch has not been set.
3.3.2 Precautions
The following precautions must be observed when assembling, testing, or replacing the Garmin Slip-
Clutch Fixture.
3.3.2.1 Mechanical Hazards
The slip-clutch fixture contains mechanical components that represent a potential hazard to
service personnel. Keep fingers, hair, and clothing free of the mechanism to prevent injury or
entrapment.
3.3.2.2 Electrical Hazards
The slip-clutch fixture contains electrical circuitry. Always follow safe and accepted electrical
service practices when operating this equipment.
3.3.2.3 Torque Relief
To avoid damage to the torque wrench, always relieve the cable (or chain) tension before
turning off the solenoid. Failure to do so may subject the torque wrench to potentially
damaging large shock loads.
Relieve the cable (or chain) tension as follows:
1) Turn off motor, leaving solenoid on.
2) Turn motor on in opposite direction (of previous operation). Turn motor off after approx. ½
second, or when tension is relieved in cable (or chain). The tension is relieved when the
wrench becomes loose in its support. Also, the torque wrench reading should be zero or
close to zero.
3) Turn off solenoid once tension is relieved.
3.3.3 Environmental Conditions
It is recommended that clutches are set in room temperature conditions. 50°F to 120°F will yield the best
results.
Page 3-2
Revision R
NOTE
NOTE
GSA 8X/GSM 85(A) Installation Manual
190-00303-72