SDR UALA2012081404501

Service difficulty report · Bleed Valve · Boeing 757222

Difficulty date: August 12, 2012
Submitted: August 17, 2012
Operation: Air carrier
Aircraft: N551UA
Make and model: Boeing 757222
Aircraft serial: 25399
Aircraft time: 78,675 hours, 22,802 cycles
Engine: Pwa PW2037
System (JASC): 7532 · Compressor Bleed Valve
Part: Bleed Valve
Part number: 32144882
Condition: Faulty
Location: Lt Engine
Stage of operation: DE
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.

What was found

LEFT ENGINE BLEED VALVE OFF LIGHT ILLUMINATED ON DESCENT STAYED ON THROUGH LANDING AND TAXI IN. SUPPLEMENTAL DATA, REPLACED NR 1 PRSOV VALVE PER MM. DURING ENG RUN LEFT BLEED INTERMITTENT, BLEED WOULD FLUCTUATE UNTIL DEMAND PLACED ON SYSTEM THEN BLEED STABILIZED FOR A FEW SECONDS, THEN BLEED WOULD SHUTOFF, WITH BLEED OFF LIGHT ILLUMINATED. ACCOMPLISHED BLEED HEALTH CHECK, FOUND PRSOV REGULATOR INOPERATOVE. REPLACED REGULATOR, OPS OK.