- Difficulty date
- July 29, 2019
- Submitted
- July 31, 2019
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41189
- Aircraft time
- 26,663 hours, 8,704 cycles
- Part
- Detector
- Part number
- 90202001
- Condition
- Failed
- Location
- Apu
- Stage of operation
- CR
- How discovered
- O
- Nature of condition
- N
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DET INOP LIGHT ILLUMINATED IN CRUISE FLIGHT LEVEL 360, 3 HOURS INTO FLIGHT. ACCOMPLISHED "APU DETECTION INOPERATIVE" QRH. APU WAS NOT RUNNING. GROUNDED - YES. COMPLIED WITH FIM 26-10 TASK 801. APU TAIL PIPE DETECTOR INOP. REMOVED AND REPLACED APU OVERHEAT DETECTOR ASSY PER AMM 26-15-01.