Service difficulty report · Compressor · Boeing 767322

Difficulty date
June 24, 2008
Submitted
July 2, 2008
Operation
Air carrier
Aircraft
N648UA
Make and model
Boeing 767322
Aircraft serial
25285
Aircraft time
67,375 hours, 10,989 cycles
Engine
Pwa PW4060
Engine time
56,317 hours, 6,951 cycles
Part
Compressor
Condition
Stalled
Location
Lt Engine
Stage of operation
DE
How discovered
O
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

LEFT ENGINE COMPRESSOR STALL WHEN THROTTLES ADVANCED. ALSO OCCURRED DURING REVERSER OPERATION. UNABLE TO FIND ANY DAMAGE TO ACCOUNT FOR THE REPORTED STALL. ADDITIONALLY, NO SURGE FLAG WAS SET. BECAUSE OF REPEATED POWERPLANT INTERFACE MANAGEMENT UNIT (PIMU) FAULTS THE EEC WAS REPLACED. SUBSEQUENT HIGH POWER RUNS, AND ACCEL-DECEL CHECKS WERE OK WITH NO STALL OR SURGE. THE AIRCRAFT RETURNED TO SERVICE WITH NO FURTHER PROBLEMS.