Service difficulty report · Controller · Bombdr DHC8402

Difficulty date
December 12, 2009
Submitted
December 16, 2009
Operation
Air carrier
Aircraft
N427QX
Make and model
Bombdr DHC8402
Aircraft serial
4156
Aircraft time
6,768 hours, 7,325 cycles
Engine
Pwc PW150A
Propeller
Dowty R4086123F17
Part
Controller
Condition
Out Of Adjust
Location
Prop Feathering
Stage of operation
TX
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

AFTER PUSHBACK NR 1 PROP TOOK OVER A MINUTE TO UNFEATHER AFTER THE CONDITION LEVER WAS BROUGHT TO MAX. IT THEN TOOK ANOTHER 30 SECONDS TO FULLY UNFEATHER. PERFORMED FUNCTIONAL TEST OF THE PROP ELECTRONIC CONTROLLER - CALIBRATION PROCEDURE IAW AMM TASK 61-20-36-720-801, AND ADJUSTMENT OF THE PROP ELECTRONIC CONTROLLER SYNCHROPHASE TRIM IAW AMM TASK 61-20-36-820-801. ALL CHECKS GOOD. C/W FUNCTIONAL TEST OF THE PROP TIME TO UNFEATHER IAW AMM TASK 61-20-00-720-801. BROUGHT C/L FROM START/ FEATHER TO MIN AND MAX MULITIPLE TIMES. TIME TO UNFEATHER WAS WITHIN LIMITS OF LESS THAN 30 SECONDS. NO FURTHER DEFECTS NOTED. NO FAULTS LOGGED IN CDS. TIME FROM UNFEATHER (MIN) TO FEATHER (START/ FEATHER) IDENTICAL BETWEEN NR 1 AND NR 2 ENG. RETURNED TO SERVICE.