SDR PNSA101101

Service difficulty report · Line · Saab 340B

Difficulty date
November 19, 2010
Submitted
November 23, 2010
Operation
Air carrier
Aircraft
N404XJ
Make and model
Saab 340B
Aircraft serial
404
Aircraft time
29,864 hours, 32,578 cycles
Engine
Ge CT79B
Engine time
27,319 hours, 30,025 cycles
Part
Line
Condition
Cracked
Location
Nr 1 Engine
Stage of operation
CL
How discovered
O
Nature of condition
R
Precautionary procedure
E

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

What was found

WHILE ON CLIMBOUT AT 1000FT AGL, THE NR 1 ENGINE EXPERIENCED A COMPRESSOR STALL IMMEDIATELY FOLLOWING A POWER REDUCTION FOR CLIMB POWER. THERE WAS 2 "BANGS" AND THE ENGINE WENT INTO AUTO COARSENING AND THE ENGINE WAS SHUT DOWN BY THE FLIGHT CREW AND NO TEMPERATURE, TORQUE OR SPEED WAS EXCEEDED, AN EMERGENCY WAS DECLARED. THE CLIMB CONTINUED AND AT 8000FT A RESTART WAS ACCOMPLISHED AND ALL ENGINE PARAMETERS WERE NORMAL. THE FLIGHT CONTINUED TO THE INTENDED DESTINATION AND THE EMERGENCY WAS CANCELLED WITH ATC. MAINTENANCE CONDUCTED A INSPECTION IAW GE SEI- 576, A BORESCOPE AND A GROUND POWER ASSURANCE RUN WAS CONDUCTED. A CRACKED HP BLEED LINE WAS FOUND DURING THE INSPECTION. THE CAUSE OF THE COMPRESSOR STALL IS BELIEVED TO BE THE POWER REDUCTION FROM A HIGH POWER SETTING AND A CRACKED BLEED LINE WHICH INDUCED A COMPRESSOR STALL. AIRCRAFT WAS RELEASED FOR SERVICE. NO COMPONENT WAS CHANGED AND NO ADJUSTMENTS WERE MADE TO THE ENGINE.

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