SDR CA101130002

Service difficulty report · Bleed Valve · Aerosp ATR72

Difficulty date: November 16, 2010
Submitted: March 15, 2011
Operation: Air carrier
Make and model: Aerosp ATR72
Engine: Pwc PW610FA
System (JASC): 7532 · Compressor Bleed Valve
Part: Bleed Valve
Condition: Damaged
Stage of operation: TO
How discovered: O
Nature of condition: J
Precautionary procedure: C

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

What was found

ABORTED TAKEOFF THE PILOT ABORTED TAKEOFF AS HE SAW THE ENGINE TEMPERATURE RISE TO 810C. THE AIRCRAFT RETURNED TO THE RAMP WHERE TROUBLESHOOTING ISOLATED THE PROBLEM TO A FAULTY HANDLING BLEED VALVE SERVO IN WHICH A PIECE OF METAL WAS OBSTRUCTING THE ORIFICE, AND PREVENTING THE VALVE FROM CLOSING. THE SERVO WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.