SDR 9500726739

Service difficulty report · Compressor · Boeing 747251F

Difficulty date
January 14, 1995
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N639US
Make and model
Boeing 747251F
Aircraft serial
23887
Engine
Pwa JT9D7R4G2
Part
Compressor
Condition
Stalled
Location
Nr 3 Engine
Stage of operation
CL
Nature of condition
R
Precautionary procedure
O

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

What was found

DURING CLIMB PASSING THROUGH FL 360, THE NR 3 ENGINE EXPERIENCED SEVERAL COMPRESSOR STALLS AND RECOVERED. ENGINE OPERATION WAS NORMAL THE REMAINDER OF THE FLIGHT. AN ENGINE INSPECTION AND BOROSCOPE CHECKED OK. THE LOWER 3.5 BLEED VALVE AND EVBC WERE REPLACED. THE ENGINE WAS PRECISION TRIMMED AND OPERATION CHECKED OK.