SDR AU960111

Service difficulty report · Coupling

Difficulty date
January 30, 1996
Submitted
March 26, 2000
Operation
General aviation
Engine
Ge CF680A
Part
Coupling
Condition
Failed
Location
T Eng Turbine Se
Component
9272M76G02
Stage of operation
CL
Nature of condition
K
Precautionary procedure
K

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

What was found

(AUS) NO2 ENGINE CONTAINED A MASSIVE OIL LEAK IN THE INTAKE AREA - INSPECTION OF THE OIL SCAVENGE PUMP FOUND THE PUMP CONTAMINATEDWITH BRAIDED SEAL MATERIAL - HP TURBINE COUPLING NUT PRESSURE TUBE RUPTURED AT THE TUBE TO AFT FLANGE WELDED JOINT - A CIRCUMFERENTIAL CRACK OF APPROXIMATELY 228.6MM (9IN) WAS FOUND WITH TWO PIECES OF THE TUBE APPROXIMATELY 19.05MM BY 19.05MM (0.75IN BY 0.75IN) AND 63.5MM BY 12.7MM (2.5IN BY 0.5IN) MISSING - THIS ALLOWED HIGH TEMPERATURE AND PRESSURE COMPRESSOR DISCHARGEAIR TO ESCAPE INTO THE COOLING AIR CAVITY OF THE HPC AND HPT ROTORS AND THEN CHANNELED FORWARD TO THE NO3 AIR/OIL SEAL CAUSINGTHE SEAL TO FAIL