SDR 2003UALA00600

Service difficulty report · Blade · Boeing 757222

Difficulty date: July 30, 2003
Submitted: August 6, 2003
Operation: Air carrier
Aircraft: N528UA
Make and model: Boeing 757222
Aircraft serial: 25018
Aircraft time: 42,069 hours, 15,548 cycles
Engine: Pwa PW2037
System (JASC): 7230 · Turbine Engine Compressor Section
Part: Blade
Condition: Failed
Location: Rt Engine
Stage of operation: TO
How discovered: O
Nature of condition: R, J
Precautionary procedure: C

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

What was found

RIGHT ENGINE COMPRESSOR STALL, EGT OVERTEMP. OIL PRESSURE DROPPED TO ZERO. ENGINE TEARDOWN VERIFIED THAT THE HPT T1 BLADE FAILED. PRATT & WHITNEY HAS BEEN INVESTIGATING THIS FAILURE FOR ROOT CAUSE AND DETERMINED THAT THE SYMPTOMS AND PART CONDITION ARE UNIQUE IN THIS EVENT. THE HPT T1 BLADE FAILED FROM A STRESS CORROSION CRACK ABOVE THE PLATFORM. AS AN ADDED NOTE, THIS TURBINE BLADE DID NOT HAVE PWA 545 PROTECTIVE COATING IN THE DAMPER POCKET.