What was found
DURING RT ENGINE START, APU DUCT PRESSURE AT 10 PSI, CYCLED LT ENGINE BLEED, PRESSURE RECOVERED BUT AT RT ENGINE START GETTING MAX 15% N2 WITH APU PNEU PRESSURE. REPLACED ISOLATION VALVE IAW MM, ACP TWO NORMAL STARTS.
- Difficulty date
- November 13, 2013
- Submitted
- December 20, 2013
- Operation
- Air carrier
- Aircraft
- N550UA
- Make and model
- Boeing 757222
- Aircraft serial
- 25398
- Aircraft time
- 82,806 hours, 23,900 cycles
- Engine
- Pwa PW2037
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Isolation Valve
- Part number
- 2790598103
- Part serial
- 5006
- Condition
- Failed
- Location
- Lt Engine
- Stage of operation
- TX
- 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.