What was found
APU DUCT PRESSURE LOW AT ENGINE START, APU INOP. *S/D* SURGE CONTROL VALVE REPLACEMENT, DID NOT HELP. REPLACED PNUEMATIC FLOW SENSING MODULE, AND OPERATION OF APU BACK TO NORMAL.
- Difficulty date
- September 10, 1997
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N544UA
- Make and model
- Boeing 757222
- Aircraft serial
- 25322
- Engine
- Pwa PW2037
- System (JASC)
- 4950 · APU Bleed Air System
- Part
- Sense Module
- Part number
- 36144001
- Condition
- Malfunctioned
- Location
- Apu
- Stage of operation
- NR
- Nature of condition
- O
- Precautionary procedure
- H
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.