SDR 2003UALA00382

Service difficulty report · Compressor · Boeing 767322

Difficulty date: April 15, 2003
Submitted: April 22, 2003
Operation: Air carrier
Aircraft: N643UA
Make and model: Boeing 767322
Aircraft serial: 25093
Aircraft time: 52,501 hours, 8,406 cycles
Engine: Pwa PW4060
System (JASC): 7230 · Turbine Engine Compressor Section
Part: Compressor
Condition: Stalled
Location: Nr 1 Engine
Stage of operation: DE
How discovered: O
Nature of condition: R, J
Precautionary procedure: O

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

What was found

COMPRESSOR STALL ON NR 1 ENGINE. ENGINE SURGED ON CLIMB AND RECOVERED. BOROSCOPE FOUND CRACK ON 14TH STAGE STATOR AND BENT 14TH AND 15TH STAGE BLADES. ENGINE WAS REMOVED AND THE HPC WILL BE OVERHAULED. UPON DISASSEMBLY OF THE HPC NO STATORS WERE CRACKED AND THERE WERE NO BENT BLADES. INSPECTION OF THE REAR HOOK WEAR IN THE COMPRESSOR SHOWED NO UNUSUAL DISTRESS. ROOT CAUSE: INCREASED TIP CLEARANCE IN THE HPC.