SDR ASAA1159758

Service difficulty report · Valve · Boeing 737890

Difficulty date: June 2, 2011
Submitted: June 6, 2011
Operation: Air carrier
Aircraft: N517AS
Make and model: Boeing 737890
Aircraft serial: 35197
Aircraft time: 9,051 hours, 2,789 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Valve
Part number: 32895625
Part serial: 6177
Condition: Failed
Location: Nr 1 Precooler
Part time: 35,546 hours, 16,965 cycles
Stage of operation: CL
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

NR 1 BLEED TRIP OFF LIGHT ILLUMINATED WHEN POWER BROUGHT UP FOR CLIMB FROM FL370 TO FL 390. COMPLIED WITH QRH AND LIGHT WENT OUT AND STAYED OUT WITH TRIP RESET. DUCT PRESSURE SPLIT AT CRUISE : L=38 R=28. TASK 36-12-00-700-801 ACCOMPLISHED PRECOOLER CONTROL VALVE SYS HEALTH CHECK. VALVE FAILED STEP 13. REPLACED PCCV PER 36-12-02-400-801. ACCOMP BLEED AIR SYS HEALTH CHECK 36-11-00-700-801 FOUND HSV TO FAIL STEP 11 C 3 J. REPLACED NR 1 ENG HIGH STAGE VALVE PER MM 36-11-06. VALVE NOW PASSES TEST REF MM 36-11-00-700-801.