Service difficulty report · Regulator · Boeing 757222

Difficulty date
July 16, 2012
Submitted
August 1, 2012
Operation
Air carrier
Aircraft
N544UA
Make and model
Boeing 757222
Aircraft serial
25322
Aircraft time
77,771 hours, 22,419 cycles
Engine
Pwa PW2037
Part
Regulator
Part number
S212N1023
Part serial
252
Condition
Faulty
Location
Posit 1
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

TROUBLESHOT WIRE RUN FOR LEFT ENG BLEED PRSOV VALVE AND LT INDICATION. CHECK WIRES AT PIN 2 AND 3 AT D5138J FOR SHORTS TO D1098P NO SHORTS FOUND. PIN 2 TO GRD AT D1098J OK. PIN 1 TO GRD AT D1098J NO SHORTS FOUND. RAN LEFT ENG PRSOV VALVE INDICATED OPEN WITH LFT DUCT PRESS AT 18PSI BUT LT REMAIN ON WHICH SHOULD HAVE INDICATED OFF WITH VALVE OPEN. REPLACED PRSOV REGULATOR AND THE HIGH PRESSURE SHUTOFF VALVE PER AMM. LEAK AND OPS CHECKED PER JRH 2-5-16, OPS NORMAL