What was found
APU FAULT LIGHT ILLUMINATED UPON UNSUCCESSFUL APU START. GROUNDED - YES. REMOVED AND REPLACED AIR INLET DOOR POSITION SWITCH REF B737-800 AMM 49-15-41 APU STARTS AND OPERATES NORMALLY. GROUND VERIFICATION SUCCESSFUL.
- Difficulty date
- June 18, 2021
- Submitted
- June 21, 2021
- Operation
- Air carrier
- Aircraft
- N512AS
- Make and model
- Boeing 737890
- Aircraft serial
- 39043
- Aircraft time
- 46,163 hours, 13,669 cycles
- System (JASC)
- 4900 · Airborne Auxiliary Power Unit (APU) System
- Part
- Switch
- Part number
- 2EN19RB
- Condition
- Faulted
- Location
- Air Inlet Door
- 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.