SDR CA010201006

Service difficulty report · Shaft · Boeing 767275

Difficulty date: September 25, 2000
Submitted: February 12, 2001
Operation: General aviation
Make and model: Boeing 767275
Aircraft time: 54,016 hours
Engine: Pwa JT9D7R4D
System (JASC): 7530 · Compressor Bleed Control
Part: Shaft
Part number: 77655557
Condition: Failed
Location: Bleed Controller
Stage of operation: DE
How discovered: O
Nature of condition: Y, J
Precautionary procedure: O

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

What was found

(CAN) STARTING DESCENT FROM 33,000 FEET, LEFT HAND ENGINE COMPRESSOR STALL, AS SOON AS ENGINE WENT TO IDLE EXHAUST GAS TEMPERATURE WENT CLOSE TO MAXIMUM RED. ENGINE WAS SHUT DOWN. ON PRELIMINARY BORESCOPE INSPECTION FOUND 5TH STAGE BLADES BENT.AFTER INVESTIGATION, THE COMPRESSOR STALL WAS DUE TO THE FAILURE OF THE EVBC (ENGINE VANE-BLEED CONTROLLER) WHICH HAD A BROKEN SHAFT. THIS CAUSE THE VANES TO CLOSE AND THE NR 3 BLEED TO OPEN.THE DAMAGE WAS LIMIT TO SOME C5 BLADES BENT.ENGINE CHANGED.