What was found
APU WILL NOT START, 2 ATTEMPTS. GROUNDED - YES. REMOVED & REPLACED APU SGU, REF B737-900 AMM 49-41-21. OPS/LEAK CHECKS GOOD. APU BITE SHOWS NO CURRENT FAULTS. GROUND VERIFICATION TEST GOOD.
- Difficulty date
- February 20, 2021
- Submitted
- February 23, 2021
- Operation
- Air carrier
- Aircraft
- N431AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 43255
- Aircraft time
- 27,642 hours, 8,912 cycles
- System (JASC)
- 2421 · AC Generator-Alternator
- Part
- Generator
- Part number
- 28B5459STYLEA
- Part serial
- 125F1895
- Condition
- Faulted
- Location
- Apu
- Part time
- 5,317 hours, 9,841 cycles
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.