SDR 96ZZZX21

Service difficulty report · Case · Boeing 727172C

Difficulty date
November 14, 1995
Submitted
March 26, 2000
Operation
General aviation
Aircraft
N527PC
Make and model
Boeing 727172C
Aircraft serial
19665
Engine
Pwa JT8D7B
Part
Case
Part number
766933
Condition
Fractured
Location
Lp Compressor
Part time
45,420 hours
Stage of operation
IN
Nature of condition
O
Precautionary procedure
K

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

What was found

ON DISASSEMBLY OF ENGINE, FOUND THE LP COMPRESOR HAD SUFFERED A 360 DEGREE FRACTURE OF FORWARD FLANGE OF INTERMEDIATE CASE (WHERE IT IS BOLTED TO THE REAR OF THE 3-4 STATOR). ON EXAMINATION OF CASE. IT WAS EVIDENT IT HAD BEEN PARTIALLY CRACKED FOR SOME TIME BEFORE FINALLY FAILING AND FRACTURING COMPLETELY THROUGH 360 DEGREES. THIS TOTAL FAILURE OF THE FRONT FLANGE CAUSED THE LP COMPRESSOR ASSY LOSS OF LOCATION, THE LP COMPRESSOR MOVING FORWARD CAUSNG HEAVY RUBS TO ALL STAGES OF LP COMPRESSOR BLADE TIPS, STAGE 3 THROUGH STAGE 6. CYCLES, 35,247.