Service difficulty report · Compressor · Boeing 737522

Difficulty date
March 5, 2007
Submitted
March 13, 2007
Operation
Air carrier
Aircraft
N932UA
Make and model
Boeing 737522
Aircraft serial
26658
Aircraft time
41,124 hours, 30,077 cycles
Engine
Cfmint CFM563C1
Engine time
42,473 hours, 25,626 cycles
Part
Compressor
Condition
Stalled
Location
Nr 1 Engine
Stage of operation
DE
How discovered
O
Nature of condition
R, E, J
Precautionary procedure
O

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

What was found

ON DESCENT NR 1 ENG COMPRESSOR STALLED WITH AUDIBLE BANGS. TWO BANGS WHEN THROTTLE RETARDED AT FL370, ENG BANGED LIGHTLY DOWN TO FL 150 AND BETWEEN FL 150-100 VIBRATION AND NOISE INCREASED. [07-03-07] FOUND MINOR DAMAGE TO THE 3RD STAGE BLADES AND VANES, WITH HEAVY DAMAGE ON THE 4TH STAGE BLADES AND VANES. MINOR DAMAGE ON THE 5TH THROUGH 9TH STAGE BLADES AND VANES. REPLACED ENGINE. REPLACED BLADES ON REMOVED ENGINE.