SDR UALA2008111406508

Service difficulty report · Regulator Valve · Boeing 757222

Difficulty date: November 13, 2008
Submitted: December 11, 2008
Operation: Air carrier
Aircraft: N598UA
Make and model: Boeing 757222
Aircraft serial: 28751
Aircraft time: 39,058 hours, 10,817 cycles
Engine: Pwa PW2037
System (JASC): 3610 · Pneumatic Distribution System
Part: Regulator Valve
Condition: Failed
Location: Bleed Air Sys
Stage of operation: IN
How discovered: O
Nature of condition: W
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

WHILE RE-ACTIVATING NR 2 ENG HS-PILOT FOUND OVERPRESSURE INDICATOR POPPED. RESET, RAN ENG AT IDLE. PRESSURE INDICATING 18 PSI. REF MEL 3611D BY- 118169: ACP'D PNEUMATIC HEALTH CK ON NR 2 ENG ON H-S PILOT, HPSOV, PRC, AND PRSOV. PRSOV CONTROLLER FAILED REF PRESSURE, PRESS EXCEEDED LIMIT. REPLACED PRSOV REGULATOR AND HIGH STAGE PILOT. OPS CHECKS NORMAL.