What was found
APU TREND DATA SHOWS CT5ATP TEMP HAS A SUDDEN SHIFT ABOVE THE 593 DEGREE THRESHOLD. GROUNDED - YES. REMOVED AND REPLACED APU REF B737-900 AMM 49-11-00-803, T/C 78349010 . LEAK CHECK GOOD. OPS CHECK GOOD.
- Difficulty date
- October 23, 2019
- Submitted
- October 23, 2019
- Operation
- Air carrier
- Aircraft
- N491AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44109
- Aircraft time
- 15,873 hours, 5,152 cycles
- System (JASC)
- 4920 · APU Core Engine
- Part
- Control Valve
- Part number
- 38007021
- Part serial
- P11085
- Condition
- Malfunctioned
- Location
- Apu
- Part time
- 4,920 hours, 9,134 cycles
- Stage of operation
- NR
- How discovered
- O
- Nature of condition
- M, J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.