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--291A
Date: August 18, 2006
SUBJECT: S--TEC Autopilot/Full Flap Condition
MODELS/ SN
AFFECTED: M20M -- All aircraft equipped with Garmin G1000 Integrated Avionics and S--TEC Autopilot
M20R -- Aircraft equipped with Garmin G1000 Integrated Avionics and S--TEC Autopilot, S/N
29--0455 and prior
TIME OF
COMPLIANCE: Do not use full flaps with autopilot engaged until this service bulletin has been complied with.
INTRODUCTION: Aircraft equipped with Garmin G1000 and S--TEC autopilot will experience a hard nose down
pitch condition with the flaps in full down position and the autopilot engaged. This condition is
corrected by reversing position of two wires in the Flap Compensation Cable Assembly supplying
the Pitch Pot and Trim Pot. By reversing the wires, the Trim Pot and Pitch Pot functions are re-
versed.
INSTRUCTIONS: Read entire procedure before beginning work.
1. Turn master switch -- OFF.
2. Locate and remove two screws securing baggage compartment left side interior panels (Ref.
Figure M20--291--001). Carefully, so as not to permanently crease the panel, pull the panel away
from fuselage structure enough to allow the pushing/sliding of the panel forward to expose the
harness where the Flap Compensation Cable Assembly connector is located.
3. Disconnect the connector.
4. On the male side of the connector, locate pins 1 and 3 (Ref. Figure M20--291--002). Depress
the tabs on the pins to allow their removal from the connector housing. Relocate pin 1 (GRN--
GRA) into pin 3 location. Relocate pin 3 (GRN--BLU) into pin 1 location.
5. Verify that the pins are resecured into the male connector housing so they will not back out
when the connector is mated to the female half.
6. Return harness to its original position. Return the interior panel to its original position. Reinstall
the two screws removed in Step 2 above.
Ground test per the following:
7. Turn autopilot ON, select HDG and ALT.
8. Pull back on control yokes sufficiently to relieve load such that autopilot controls are not trim-
ming in either UP or DN direction.
9. Lower flaps to TO. The electric trim should immediately trim nose up. When flaps stop moving,
the electric trim should stop.
10. Lower flaps to DN. The electric trim should immediately trim nose up. When flaps stop mov-
ing, the electric trim should stop.
11. Raise flaps to TO. The electric trim should immediately trim nose down. When flaps stop mov-
ing, the electric trim should stop.
12. Raise flaps to UP. The electric trim should immediately trim nose down. When flaps stop mov-
ing, the electric trim should stop.
13. Test fly aircraft to confirm correct response to control commands with flaps in full down posi-
tion and autopilot engaged.
14. Complete log book entry.
15. Return aircraft to service.
16. Procedure complete.
WARRANTY: Mooney Airplane Company, Inc. will warrant labor:
Approximately 1.0 hours
when done in accordance with procedures of this Service Bulletin.
MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com
REFERENCE
DATA: MAC Service & Maintenance Manuals (applicable A/C)
PARTS LIST: No parts required
BAGGAGE COMPARTMENT
INTERIOR PANEL
SCREW
SCREW
FLAP COMPENSATION
CABLE ASSY
Figure SB M20-291-1
MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com
AIRCRAFT
919026--35/20
PITCH POT
TRIM POT
919026--35/20
LR
C
POT SHAFT
“ALT COLOR”
ORANGE
BLUE
WHITE
GRN--GRA
GRN--VIO
GRN--BLU
(55”)
919026--59/20/SH
1
2
3
4
FLAP
FLAP COMPENSATION
CABLE ASSY
NOTE:
POSITION OF TRIM/PITCH
POTS REVERSED
NOTE:
REVERSED PINS 1 AND 3
CR
L
GRN--GRA
GRN--VIO
GRN--BLU
SH DRAIN
GROUND
“ALT COLOR”
ORANGE
BLUE
WHITE
AIRCRAFT
919026--35/20
PITCH POT
TRIM POT
919026--35/20
LR
C
POT SHAFT
“ALT COLOR”
ORANGE
BLUE
WHITE
GRN--GRA
GRN--VIO
GRN--BLU
(55”)
919026--59/20/SH
1
2
3
4
FLAP
FLAP COMPENSATION
CABLE ASSY
CR
L
GRN--BLU
GRN--VIO
GRN--GRA
SH DRAIN
GROUND
“ALT COLOR”
WHITE
BLUE
ORANGE
“WAS”
“IS”
Figure SB M20-291-2
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1
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2
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3
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