- Difficulty date
- October 28, 2019
- Submitted
- October 30, 2019
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41734
- Aircraft time
- 26,268 hours, 8,519 cycles
- Part
- Module
- Condition
- Faulted
- Location
- Apu
- Stage of operation
- CR
- 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
APU CSS FAILED FL350, FL350 AND FL310. APU FAULT LIGHT ILLUMINATED. APU OPERATES NORMALLY ON THE GROUND. GROUNDED - YES. PREFORMED APU BITE FOUND FAULT MSG 49-72104 DMM MODULE FAULT, PREFORMED APU START ON GND PER B737-900 AMM 49-11-00 APU START NORMAL, NO FAULT NOTED OK FOR SERVICE.