Service difficulty report · Compressor · Boeing 747422

Difficulty date
July 23, 1996
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N190UA
Make and model
Boeing 747422
Aircraft serial
26879
Engine
Pwa PW4056
Part
Compressor
Condition
Stalled
Location
Engine
Stage of operation
CL
Nature of condition
J, M
Precautionary procedure
E, A

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

What was found

45 SECONDS AFTER TAKEOFF, POWER APPLIED, EXPERIENCED 2 RAPID COMPRESSOR STALLS WITH MAX EPR. IDLED ENGINE FOR ONE MINUTE AND THEN SHUT IT DOWN. RETURNED TO FIELD. ENGINE WAS REPLACED. CAUSE OF COMPRESSOR STALLS WAS GENERAL DETERIORATION OF THE HIGH PRESSURE COMPRESSOR WHICH IN TURN CAUSED LOSS OF SURGE MARGIN.