SDR Q2SA789001

Service difficulty report · Compressor · Boeing 747341

Difficulty date
October 10, 2008
Submitted
October 10, 2008
Operation
Air carrier
Aircraft
N789SA
Make and model
Boeing 747341
Aircraft serial
23394
Aircraft time
63,355 hours, 12,288 cycles
Engine
Ge CF650E2
Engine time
95,546 hours, 16,366 cycles
Part
Compressor
Condition
Stalled
Location
Nr 2 Engine
Stage of operation
CR
How discovered
O
Nature of condition
J, R
Precautionary procedure
E, B

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

What was found

EN ROUTE FROM SPIM TO KMIA DURING CLIMB AND CRUISE, NR 2 ENGINE EXPERIENCED HIGHER EGT READING (70 DEG) THAN OTHER ENGINES. REDUCED THRUST SETTINGS ON NR 2 ENGINE LOWERED HIGHER EGT READING TO 30 DEG ABOVE OTHER ENGINES, WITH NO ROUGHNESS OR APPARENT ENGINE INSTABILITY. APPROXIMATELY 2 HOURS, 44 MINUTES INTO CRUISE FLIGHT, ENGINE NR 2 EXPERIENCED SEVERAL RAPID COMPRESSOR STALLS WITH AUDIBLE BANGS, ALSO RESULTING IN RAPID DROP OF N1. ENGINE IMMEDIATELY CUTOFF, AND PILOT PERFORMED DESCENT FROM FL320 TO FL300, WITH SUBSEQUENT CONTINUATION OF FLIGHT TO KMIA. NO FUEL WAS DUMPED. SUBSEQUENT BORESCOPE INSPECTION PERFORMED. ENGINE CHANGE REQUIRED.