Service difficulty report · Control Unit · Bombdr DHC8402

Difficulty date
August 25, 2020
Submitted
August 27, 2020
Operation
Air carrier
Aircraft
N421QX
Make and model
Bombdr DHC8402
Aircraft serial
4149
Aircraft time
31,491 hours, 33,794 cycles
Part
Control Unit
Part number
3985001009
Part serial
00636
Condition
Malfunctioned
Location
Pitch Trim
Part time
16,822 hours, 18,236 cycles
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

PITCH TRIM MASTER CAUTION AND AUTO TRIM FAIL ON FMA DURING CLIMBOUT . ELEVATOR TRIM INDICATOR SHOWED FULL NOSE UP. NO CIRCUIT BREAKERS POPPED. REMOVED FROM SERVICE. FOUND FAULTS ON CDS IFC FAILURE X2, FCECU FAILURE 67, 63, E7, AND E3 REF Q400 FIM 27-30-00-810-803. REPLACED THE FCECU Q400 AMM 27-00-01-000-802 AND 27-00-01-400-802 OPS TEST GOOD. PITCH TRIM MASTER CAUTION REMAINS EXTINGUISHED. NO FAULTS IN CDS. NO FURTHER DEFECTS NOTED. AUTO TRIM FAIL NO LONGER DISPLAYED. RETURNED TO SERVICE.