SDR CA091210011

Service difficulty report · Control Valve · Boeing 737*

Difficulty date: December 8, 2009
Submitted: January 19, 2010
Operation: General aviation
Make and model: Boeing 737*
Aircraft time: 7,847 hours
Engine: Cfmint CFM567B22
System (JASC): 7500 · Engine Bleed Air System
Part: Control Valve
Part number: 1296662
Condition: Failed
Location: Precooler
Part time: 8,720 hours
Component: Precooler
Component part number: 32895625
Stage of operation: DE
How discovered: O
Nature of condition: 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) ON DESCENT, THE PILOTS REPORTED A DUAL BLEED TRIP. BOTH BLEED TRIPS WERE SUCCESSFULLY RESET IN FLIGHT BY THE CREW. MX CARRIED OUT A CHECK OF BLEED SYS AND REPLACED NR1 PRECOOLER CONTROL VALVE, NR 1 PRECOOLER CONTROL VALVE SENSOR AND NR2 PRECOOLER CONTROL VALVE SENSOR. OTHER PART INFORMATION: ENG 1 PRE COOLER CONTROL VALVE SENSOR PN 129666-2, TSI 8823, CSI 7117, SN 11445 ENG 2 PRE COOLER CONTROL VALVE SENSOR PN 129666-2, TSI 10833, CSI 8656, SN 11066.