SDR 2006UALA01770

Service difficulty report · Compressor · Boeing 757222

Difficulty date: September 9, 2006
Submitted: September 19, 2006
Operation: Air carrier
Aircraft: N523UA
Make and model: Boeing 757222
Aircraft serial: 24932
Aircraft time: 53,182 hours, 19,605 cycles
Engine: Pwa PW2037
System (JASC): 7230 · Turbine Engine Compressor Section
Part: Compressor
Condition: Stalled
Location: Nr 1 Engine
Stage of operation: NR
How discovered: 9
Nature of condition: O
Precautionary procedure: O

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

What was found

AFTER FCU CHANGE NR 1 ENG HAD COMPRESSOR STALL ON DECEL AT APPROX 1.12 EPR, THEN 3 MORE STALLS AT IDLE THEN AUTO SHUTDOWN. NR 1 ENG RESTART FAILED, ENG HUNG STARTED AT 40% N2 WITH N1 ROTATION, EGT AT 225 DEG, FUEL FLOW NORMAL AT .6, DUCT PRESS WAS 30 PSI. FOUND VSV ACTUATOR LOWER ATTACH POINT BROKEN OFF. ENGINE WAS REPLACED.