SDR ASAA1159023

Service difficulty report · Unknown · Boeing 737890

Difficulty date: February 11, 2011
Submitted: February 16, 2011
Operation: Air carrier
Aircraft: N559AS
Make and model: Boeing 737890
Aircraft serial: 35178
Aircraft time: 16,622 hours, 5,003 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Unknown
Condition: Unknown
Location: Bleed Air Sys
Stage of operation: CL
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

DURING CLIMBOUT AT FL360 N1 99.0-99.0 SAT 60 L DUCT PRESSURE STAYED AT 43 PSI RT DUCT PRESSURE DROPPED TO 23 PSI. STAYED AT 23 PSI UNTIL CRUISE THEN CAME UP TO 34 PSI. COMPLIED WITH FIM 36-10-00-810-804. FOUND NR 1 AND NR 2 ENGINE PRECOOLER CONTROL VALVES AND HIGH STAGE VALVES FAILED ENGINE BLEED AIR SYSTEM HEALTH CHECK PER T/C N4000001. REPLACED NR 1 AND NR 2 ENGINE PCVS AND HIGH STAGE VALVES. ACCOMP REPAIR CONFIRMATION PER FIM 36-10-00-810-804 STEP G. SYSTEM CHECKED GOOD.