What was found
DUCT PRESS DROPS WHEN USING APU BLEED AIR FOR ENGINE START OR PACK OPERATION. DUCT PRESSURE DROPS TO. DUCT PRESS DROPS 11-15 PSI DURING ENGINE START. NO LOAD DUCT PRESS 25 PSI. REPLACED SURGE VALVE & BLEED VALVE.
- Difficulty date
- April 4, 2009
- Submitted
- April 6, 2009
- Operation
- Air carrier
- Aircraft
- N670UA
- Make and model
- Boeing 767322
- Aircraft serial
- 29240
- Aircraft time
- 34,503 hours, 9,228 cycles
- Engine
- Pwa PW4056
- System (JASC)
- 4950 · APU Bleed Air System
- Part
- Valve
- Part number
- 97980612
- Part serial
- 99
- Condition
- Faulty
- Location
- Apu
- Stage of operation
- IN
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.