Service difficulty report · Control Unit · Boeing 737890

Difficulty date
December 3, 2021
Submitted
December 10, 2021
Operation
Air carrier
Aircraft
N535AS
Make and model
Boeing 737890
Aircraft serial
35200
Aircraft time
39,834 hours, 11,420 cycles
Part
Control Unit
Part number
1853M33P06
Part serial
LMDN7912
Condition
Faulty
Location
#1 Engine
Part time
55,769 hours, 18,293 cycles
Stage of operation
IN
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

#1 ENGINE SHORT TIME FAULT. MSG 73-10341. THE FMV POSITION SIGNAL IS OUT OF RANGE. DEFERRED PER T/C 78273000. GROUNDED - YES. C/W B737-800 FIM 73-25 TASK 803 UP TO STEP F6A NO DEFECTS & RESISTANCE GOOD. REPLACED #1 ENG EEC REF B737-800 AMM 73-21-60-400-801-F00 & ACTUATORS TEST OK. OPS OK REF AMM 71-00-00-700-807-F00. EEC #1 TEST OK AFTER ENG RUN REF AMM 73-21-60-000-801-F00 NO FAULTS. #1 ENG RUN OK. ETOPS GROUND VERIFICATION COMPLETE.