SDR EIAA9509

Service difficulty report · Compressor · Boeing 747131

Difficulty date
April 3, 1995
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N472EV
Make and model
Boeing 747131
Aircraft serial
20320
Engine
Pwa JT9D7F
Part
Compressor
Condition
Stalled
Location
Nr 1 Eng
Stage of operation
DE
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

NR 1 ENG COMPRESSOR STALLS DURING INITIAL DESCENT, DOES NOT RESPOND TO THROTTLE MOVEMENT. ENG SHUTDOWN. EGT AROUND 810 DEGREES WITH THROTTLE AT IDLE. ATTEMPTED ENG START ABOVE FL 200 STALL DID NOT CLEAR. BELOW FL 200 ENG STARTED. ALL PARAMETERS WERE NORM. INSPECTED INLET, EXHAUST AND 3.5 BLEEDS FOR METAL PARTICLES NOTHING ABNORM NOTED. PERFORMED PWR RUN PER MM 71-00-00, CHECKING HI-STAGE, TANDEM BLEED AND AIR GROUND LOGIC BLEED OPERATION. ALL NORM. PERFORMED EVC TRACK CHKS AND PT2 LEAK CHK AND FOUND OK. CHK'D EVC UNISON RING, PT3 AND PS3 SENSE LINE FOR SECURITY AND FOUND OK. REPLACED EVC PH FILTER AND PRBC VALVE AS PRECAUTIONARY. PERFORMED PWR RUN PER 71-00-00, ENG T/S, ENG OPERATION WAS NORM. (M)