SDR 9809726624

Service difficulty report · Compressor · Boeing 747251B

Difficulty date: June 27, 1998
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N624US
Make and model: Boeing 747251B
Aircraft serial: 21706
Engine: Pwa JT9D7Q
System (JASC): 7230 · Turbine Engine Compressor Section
Part: Compressor
Condition: Stalled
Location: Nr 4 Engine
Stage of operation: CL
Nature of condition: Y
Precautionary procedure: A, E, J

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

What was found

WHILE CLIMBING THROUGH 1400 FEET AGL, THE NR 4 ENGINE AUDIBLY COMPRESSOR STALLED AND FLAMED OUT. THE CREW SECURED THE ENGINE, DUMPED FUEL, RETURNED TO MSP, AND LANDED WITHOUT INCIDENT. THE NR 4 ENGINE WAS CHANGED. EXACT PART CAUSING PROBLEM TO BE DETERMINED.