SDR UIEA2011031100149

Service difficulty report · Check Valve · Boeing 7472D7B

Difficulty date: March 11, 2011
Submitted: March 13, 2011
Operation: Air carrier
Aircraft: N524MC
Make and model: Boeing 7472D7B
Aircraft serial: 21784
Aircraft time: 104,582 hours, 21,739 cycles
Engine: Ge CF650*
System (JASC): 7200 · Engine (Turbine/Turboprop)
Part: Check Valve
Part number: 77385619
Part serial: 890829
Condition: Failed
Location: Nr 4 Engine
Stage of operation: TO
How discovered: 9
Nature of condition: O
Precautionary procedure: C

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

What was found

BLOCK TURN BACK DUE NR 4 ENGINE FAILED TO ACCELERATE PAST 40 PERCENT N1, WITH HIGH EGT AND 4 COMPRESSOR STALLS WERE EXPERIENCED. (REPLACED 8TH STAGE CHECK VALVE AND PERFORMED ENGINE RUNUP. ALL OPERATES NORMAL. DUE TO COMPRESSOR STALL, BOROSCOPE INSPECTION ACCOMPLISHED, OK.)

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