SDR 2008UALA00619

Service difficulty report · Engine · Boeing 777222

Difficulty date: February 3, 2008
Submitted: February 5, 2008
Operation: Air carrier
Aircraft: N793UA
Make and model: Boeing 777222
Aircraft serial: 26946
Aircraft time: 45,914 hours, 6,932 cycles
Engine: Pwa PW4090
Engine time: 36,816 hours, 5,412 cycles
System (JASC): 7200 · Engine (Turbine/Turboprop)
Part: Engine
Condition: Damaged
Location: Nr 1
Stage of operation: IN
How discovered: O
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

SILENT SURGES DETECTED IN NR 1 ENGINE. ENGINE REPLACED AT SFO DUE TO HEAVY HP COMPRESSOR BLADE DAMAGE FOUND BY BORESCOPE INSPECTION. ONE BLADE WAS FOUND BROKEN IN THE AIRFOIL. SUSPECT DAMAGE TO BE THE RESULT OF VSV INNER TRUNNION BUTTON LIBERATION. THIS IS A FIRST RUN HP COMPRESSOR. FINDINGS TO BE UPDATED FOLLOWING HP COMPRESSOR TEARDOWN. ESTIMATE 03/31/08.