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SDR ASAA2013063095359

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Service difficulty report · Valve · Boeing 737890

FAA SDR system

Difficulty date
June 30, 2013
Submitted
July 2, 2013
Operation
Air carrier
Aircraft
N534AS
Make and model
Boeing 737890
Aircraft serial
35202
Aircraft time
9,936 hours, 2,955 cycles
System (JASC)
3610 · Pneumatic Distribution System
Part
Valve
Part number
32895625
Part serial
4361
Condition
Failed
Location
Nr 1 Engine
Part time
54,999 hours, 22,767 cycles
Stage of operation
CR
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

PRESSURIZATION SPLIT IN THE PANEL. RT READS 42 AND LT READS 20 AT CRUISE. PARAMETERS FLIGHT LEVEL 370, RT N1 92.7, LT N1 92.8. RIGHT N2 95.6, LT N2 95.4. CABIN DIFFERENTIAL PRESSURE 7.9, CABIN ALTITUDE 8000. ACFT GROUNDED. PERFORMED NR 1 ENGINE BLEED AIR HEALTH CHECK IAW T/C NG-36WC-00001. PRECOOLER CONTROL VALVE FAILED. ACCOMPLISHED ENGINE BLEED AIR CROSSOVER, OPS TEST IAW AMM 36-11-00, OPS CHECKED GOOD.