Service difficulty report · Power Unit · Bombdr DHC8402

Difficulty date
April 16, 2017
Submitted
April 17, 2017
Operation
Air carrier
Aircraft
N426QX
Make and model
Bombdr DHC8402
Aircraft serial
4154
Aircraft time
24,537 hours, 26,252 cycles
Part
Power Unit
Part number
C1486562
Part serial
1206
Condition
Malfunctioned
Location
Te Flaps
Part time
22,162 hours, 23,734 cycles
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FLAP POWER CAUTION ILLUMINATED IN CRUISE FLIGHT WITH NO ABNORMAL INDICATIONS. EMERGENCY DECLARED. LANDING UNEVENTFUL. THE FLAP CONTROL CIRCUIT BREAKER DID NOT TRIP. RESETTING VIA THE E/A CHECKLIST CAUSED A MOMENTARY EXTINGUISH OF THE FLAP POWER CAUTION LIGHT, IT ILLUMINATED AGAIN IN 5-8 SECONDS LATER. FOUND FAULT ASYMMETRY IN CDS. DUE TO HISTORY, REMOVED AND REPLACED FLAP POWER UNIT IAW 27-52-01-000/400-801, FUNCTIONAL TEST GOOD. ALSO RENAMED AND CLEANED CONNECTORS AT FLAP POSITION TRANSDUCERS FUNCTION CHECKED GOOD. PERFORMED GVI OF RT AND LT FLAP DRIVE SHAFTS , NO DEFECTS NOTED. CYCLED FLAPS SEVERAL TIMES WITH NO FAULTS IN CDS. NO LEAKS NOTED.