MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
11
Rev Date
MAR 2017
payoff angle equals or exceeds 3 deg. limit, adjust
bracket position to reduce payoff angle
.
I.
Install RH Tailcone access panels.
J. Turn master switch - ON.
K. Check and verify control system for free “non-
binding” movement.
22-10-04 SERVO CLUTCH ADJUSTMENT
A
. For instructions on checking the slip- clutch,
refer to the GSM Slip- Clutch Setting Procedure in
the GSA 8X/GSM 86 Installation Manual (Garmin
part number 190- 00303- 83 or later revision). To de-
termine the slip-clutch torque setting refer to Figure
22- 9. If a slip clutch is found to be out of spec, it
should be replaced with a new slip clutch. GSM 86
slip clutches are not settable once manufactured.
Manually override the slip clutch every 12 months
using an approved method in accordance with in-
structions for continued airworthiness (refer to the
example below).
Example Slip Clutch Override Procedure
1. On the ground, with the autopilot off, check for
freedom of control movement in all control axes
which have a servo actuator connected, including
trim.
2. Power up the aircraft avionics in configuration
mode.
3. Navigate to the second of t he GFC pages.
4. Engage one of the servo actuators (start with
pitch, for instance). Select t he “ENG CLCH” soft key
which turns on the internal engage clutch. Also se-
lect zero speed in the “DRIVE SERVO” area of
the screen and select the “DRV SRVO” soft key. This
ensures the servo actuator will hold zero
speed through this check.
-NOTE-
This procedure will only work correctly if both
are selected. False readings may be given
otherwise. During the next two steps, the soft
keys “DIS CLCH” and “STP SRVO” should
be showing – don’t select them yet.
5. Override the servo actuator slip clutch for the
engaged axis by moving the appropriate control
(move yoke or stick forward and back for pitch)
through its range of motion. The controls should
move, with some resistance, through their range of
motion.
-NOTE-
It is not necessary to move each trim control
through its full range of motion; it should be
moved sufficiently both directions to determ -
ine that the slip clutch of the servo actuator is
being overridden.
6. Ensure the servo motor does not turn by view-
ing the “SPEED” (speed of motor) in the “SERVO
DATA” area of the screen as you override the slip
clutch.
-NOTE-
The motor of the servo actuator should remain
stationary as the slip clutch slips.
7. Disengage the servo actuator by selecting
“DIS CLCH” and “STP SRVO”, and check for free-
dom
of movement of controls. The resistance to move-
ment from the autopilot actuator slip clutch
should not be present.
8. Repeat for each manual flight control t hat has
a servo actuator connected to it, including trim.
No scheduled maintenance of the GSM 86 seals is
required. However, if during installation or replace-
ment of the GSM 86 it is determined that an o- ring
seal in the unit back plate is missing or damaged, the
seal must be replaced with the appropriate Garmin
part number as identified in the Note below.
-NOTE-
There are two o- ring seals pressed into
grooves in the back plate of GSM 86 units (ex-
cept for GSM 86 part numbers 011- 01904- 03
and 011-01904-04, in which there are no o- ring
seals in the back plate). If it is found during
installation, removal, or re-installation of a
GSM 86 that either of the o- rings has become
detached from the rear plate, carefully inspect
the o- ring and ensure there are no cuts or any
other damage. If no damage is found, reinstall
the o- ring(s) in the rear plate, being careful not
to stretch or compress it along its length while
installing into the groove i n the rear plate. If
either o- ring is missing or damaged, replace
with Garmin part number 251-20031-00.
22-10-04
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