SDR 2006UALA01510

Service difficulty report · Engine · Boeing 777222

Difficulty date: August 3, 2006
Submitted: August 8, 2006
Operation: Air carrier
Aircraft: N793UA
Make and model: Boeing 777222
Aircraft serial: 26946
Aircraft time: 39,425 hours, 6,071 cycles
Engine: Pwa PW4090
Engine time: 20,318 hours, 3,053 cycles
System (JASC): 7200 · Engine (Turbine/Turboprop)
Part: Engine
Condition: Seized
Location: Right
Stage of operation: NR
How discovered: O
Nature of condition: Y, J
Precautionary procedure: A

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

What was found

RT ENGINE SEIZED AT 14000 FT. AMBER ALERT DECLARED. ENGINE REPLACED AT IAD. SHOP TEARDOWN FOUND ONE HPT STAGE-2 BLADE FAILED UNDER THE THE PLATFORM DUE TO STRESS CORROSION CRACKING. SIX (6) ADJACENT BLADES WERE FRACTURED, AS A RESULT, APPROXIMATELY 1/4" ABOVE THE PLATFORM, THEREBY CAUSING HEAVY VIBRATION. SEVENTEEN (17) OTHER STAGE-2 BLADES WERE SIMILARILY FRACTURED 1/4" ABOVE THE PLATFORM. ALL MAINLINE BEARINGS SUFFERED HEAVY RESULTANT DAMAGE, ANF THE N1 & N2 ROTORS WERE FROZEN.THIS WAS A FIRST RUN ENGINE.