Doc # 6.02.01 Page 101
Rev. 4 09 Jan 2003
27-50-00
AMM
DA 40 Series
Trouble Possible Cause Repair
Flap circuit-breaker opens when the flaps have moved only a short distance from the UP 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 defective. Do a test of the airplane electrical system voltage. Do a test for 14 V at the motor with flaps selected. If there is 14 V 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 Micro-switch 4 defective. Replace the micro-switch.
LDG position. Flaps move Open circuit in the micro-switch 4 Do a continuity test of the
to T/O and UP correctly. wiring. wiring. Repair or replace the defective wire.
Flaps will not move to UP Micro-switch 1 defective. Replace the micro-switch.
position. Flaps move to Open circuit in the micro-switch 1 Do a continuity test of the
T/O and LDG correctly. wiring. wiring. Repair or replace the defective wire.
27-50-00
Flight Controls
AMM
DA 40 Series
Trouble Possible Cause Repair
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 UP 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 UP indication when the flaps are in the UP position. Flaps will not move from UP to T/O. Flaps move from UP 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.
No T/O indication when the flaps are in the T/O position. Flaps move to all positions correctly. Micro-switch 3 defective. Open circuit in the micro-switch 3 wiring. Replace the micro-switch. Do a continuity test of the wiring. Repair or replace the defective wire.
Flap circuit-breaker opens at the end of down movement. Micro-switch 4 defective. Replace the micro-switch.
Flap circuit-breaker opens at the end of up movement. Micro-switch 1 defective. Replace the micro-switch.
LDG LED stays on when the flaps are not in the LDG position. The other indications operate correctly. Micro-switch 5 defective. Replace the micro-switch.
UP LED stays on when the flaps are not in the UP position. The other indications operate correctly. Micro-switch 2 defective. Replace the micro-switch.
27-50-00
AMM
Trouble Possible Cause Repair
T/O LED stays on when the flaps are not in the T/O position. The other indications operate correctly. Micro-switch 3 defective. Replace the micro-switch.
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