What was found
DURING DESCENT LEFT DUCT PRESSURE OSCILLATED BETWEEN 5PSI & 30PSI. RIGHT PRESSURE WAS STEADY. REPLACED HIGH STAGE PILOT VALVE AND PRSOV REGULATOR VALVE. RAN ENGINE AT IDLE, NO FLUCTUATION VISIBLE.
- Difficulty date
- October 20, 2011
- Submitted
- October 21, 2011
- Operation
- Air carrier
- Aircraft
- N551UA
- Make and model
- Boeing 757222
- Aircraft serial
- 25399
- Aircraft time
- 75,831 hours, 21,957 cycles
- Engine
- Pwa PW2037
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Shutoff Valve
- Condition
- Malfunctioned
- Location
- Bleed Air Sys
- Stage of operation
- DE
- 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.