SDR ASAA2020122533758

Service difficulty report · Exciter · Boeing 737890

Difficulty date: December 25, 2020
Submitted: December 29, 2020
Operation: Air carrier
Aircraft: N535AS
Make and model: Boeing 737890
Aircraft serial: 35200
Aircraft time: 36,710 hours, 10,581 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Exciter
Part number: 38880585
Part serial: J17510392
Condition: Faulty
Location: Apu
Part time: 2,708 hours, 4,641 cycles
Stage of operation: NR
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

ON APU STARTUP, APU FAULT LIGHT ILLUMINATED. GROUNDED-YES. REF B737-800 FIM 49-40 TASK 802, FOUND NO NOISE COMING FROM IGNITER PLUG DURING START. R & R IGNITER PLUG, REF B737-800 AMM 49-41-51. R & R IGNITER UNIT, REF AMM 49-41-39. R & R IGNITER LEAD, REF AMM 49-41-52. STARTED APU, WITH NO DEFECTS NOTED. NO CURRENT FAULTS IN CURRENT STATUS. GROUND VERIFICATION SUCCESSFUL.