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detailed in the Trouble column read across to the Possible Cause column. Then do the repair in the
Repair column.
Complaint Possible Cause Repair
Flaps do not operate. Circuit breaker not set.
Airplane electrical system
voltage low.
Flap selector switch defective.
Set the flap circuit breaker.
Do a test of the aircraft
electrical system voltage.
Replace the flap electronic
control unit.
Flap circuit-breaker will not stay
closed.
Short to ground in the wires to
the electrical control unit or the
micro-switches.
Short to ground in the electrical
control unit.
Short to ground in a microswitch.
Short to ground in a wire
between a closed micro-switch
and the control unit.
Do an insulation test between
each wire and ground. Repair
or replace defective wires.
Replace the electrical control
unit.
Replace the micro-switch.
Do an insulation test between
each wire and ground. Repair
or replace defective wires.
Flap circuit-breaker opens when
flap selector switch moved to
any down position.
Short to ground in a motor
supply wire.
Do an insulation test between
each wire and ground. Repair
or replace defective wires.
Flap circuit-breaker opens when
flap selector switch moved to
any up position.
Short to ground in a motor
supply wire.
Do an insulation test between
each wire and ground. Repair
or replace defective wires.
Flap circuit-breaker opens when
the flaps stop at the chosen
position.
Short to ground in the wires to
the electrical control unit from
the related indication microswitch.
Do an insulation test between
each wire and ground. Repair
or replace defective wires.
Flight Controls
DA20-C1 AMM
Page 102
19 Dec 1997 27-50-00 Doc # DA201-C1
Rev. 0
Complaint Possible Cause Repair
Flap circuit-breaker opens when
the flaps have moved only a
short distance from the CRUISE
setting.
Short to ground in the wires to
the electrical control unit from
micro-switch 1.
Do an insulation test between
each wire and ground. Repair
or replace defective wires.
Flap circuit-breaker opens when
the flaps have moved only a
short distance from the LDG
setting.
Short to ground in the wires to
the electrical control unit from
micro-switch 4.
Do an insulation test between
each wire and ground. Repair
or replace defective wires.
Flaps move slowly. Airplane electrical system
voltage low.
Flap motor defective.
Flap actuator.
Do a test of the aircraft
electrical system voltage.
Do a test for 12V at the motor
with flaps selected. If there is
12V at the motor. Replace
the actuator.
Examine the actuator. If you
find damage, then replace the
flap actuator.
Flaps do no not align with the
wing trailing edge.
Flaps extended at too high
airspeed.
Examine the flap system.
Replace damaged parts.
Adjust the system.
Flaps will not move to LDG
position. Flaps move to T/O
and CRUISE correctly.
Micro-switch 4 defective.
Open circuit in the micro-switch
4 wiring.
Replace the micro-switch.
Do a continuity test of the
wiring. Repair or replace the
defective wire.
Flaps will not move to CRUISE
position. Flaps move to T/O
and LDG correctly.
Micro-switch 1 defective.
Open circuit in the micro-switch
1 wiring.
Replace the micro-switch.
Do a continuity test of the
wiring. Repair or replace the
defective wire.
No LDG indication when the
flaps are in the LDG position.
Flaps will not move from LDG to
T/O. Flaps move from LDG to
CRUISE correctly.
Micro-switch 5 defective.
Open circuit in the micro-switch
5 wiring.
Replace the micro-switch.
Do a continuity test of the
wiring. Repair or replace the
defective wire.
No CRUISE indication when the
flaps are in the CRUISE
position. Flaps will not move
from CRUISE to T/O. Flaps
move from CRUISE to LDG
correctly.
Micro-switch 2 defective.
Open circuit in the micro-switch
2 wiring.
Replace the micro-switch.
Do a continuity test of the
wiring. Repair or replace the
defective wire.
DA20-C1 AMM
Flight Controls
Doc # DA201-C1
Rev. 0 27-50-00 Page 103
19 Dec 1997
Complaint Possible Cause Repair
No T/O indication when the
flaps are in the T/O position.
Flaps move to all positions
　
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