What was found
APU FAILED START (THREE ATTEMPTS) AT FL380. FAULT LIGHT ILLUMINATED DURING EACH START ATTEMPT. GROUNDED - YES. REPLACED APU SGU, REF B737-900 AMM 49-44-21. PERFORMED APU START AND OPERATION, PER AMM TASK 49-11-00-806-801. OPS NORMAL.
- Difficulty date
- August 22, 2020
- Submitted
- August 25, 2020
- Operation
- Air carrier
- Aircraft
- N469AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41702
- Aircraft time
- 23,288 hours, 7,509 cycles
- System (JASC)
- 2421 · AC Generator-Alternator
- Part
- Generator
- Part number
- 28B5459STYLEA
- Part serial
- 64F1034
- Condition
- Failed
- Location
- Apu
- Part time
- 6,993 hours, 13,109 cycles
- Stage of operation
- CR
- How discovered
- 9
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.