Service difficulty report · Engine · Boeing 747212B

Difficulty date
August 6, 2012
Submitted
August 9, 2012
Operation
Air carrier
Aircraft
N708CK
Make and model
Boeing 747212B
Aircraft serial
21937
Aircraft time
102,169 hours, 19,367 cycles
Engine
Pwa JT9D7Q
Engine time
51,556 hours, 10,794 cycles
Part
Engine
Condition
Malfunctioned
Location
Nr 3
Stage of operation
CL
How discovered
O
Nature of condition
E
Precautionary procedure
E, A

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

What was found

CLIMBING THRU FL 26.0 NR 3 ENGINE EXPERIENCED A LOUD BANG FOLLOWED BY VIBRATION. ENGINE WAS SHUTDOWN IAW QRH PROCEDURES, NO FIRE LIGHT ILLUMINATED. AFTER SHUTDOWN, OIL PRESSURE READS 6 PSI AND N2 RPM 21%. TOTAL FLIGHT TIME ENGINE WINDMILLED 58 MINUTES. TIME OFF FAILURE 2205Z. MAX EGT OBSERVED WAS 818°C FOR A 25 SECOND DURATION. UPON PERFORMING QRH PROCEDURE IN SHUTTING DOWN ENGINE, EGT RETURNED BACK TO NORMAL LIMITS.

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