SDR ASAA0956149

Service difficulty report · Controller · Boeing 737890

Difficulty date: July 5, 2009
Submitted: July 9, 2009
Operation: Air carrier
Aircraft: N517AS
Make and model: Boeing 737890
Aircraft serial: 35197
Aircraft time: 1,854 hours, 556 cycles
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Part number: 2193301AC
Part serial: 0896245
Condition: Faulty
Location: Cabin Pressure
Part time: 1,854 hours, 556 cycles
Stage of operation: DE
How discovered: O
Nature of condition: J
Precautionary procedure: K

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

What was found

DURING DESCENT WHEN THRUST WAS BROUGHT TO IDLE PRESS. "AUTO FAIL" LIGHT AND "ALTN" LIGHT CAME ON. RAN QRH AND SWITCHED PRESS CONTROL TO ALTERNATE AND "AUTO FAIL" LIGHT EXTINGUISHED. PRESS REMAINED UNDER CONTROL (DESCENDING CABIN) AT ALL TIMES. PERFORMED FIM TASK 21 31 00 810 801. FOUND FAULT ON NR 1 PRESSURE CONTROLLER LEG 00 OFV LRU FAIL FAULT CODE 078. RAN SYSTEM TEST, SYSTEM OK AND RESET. NO HISTORY 30 DAYS. SEAMC NOTIFIED, GROUND VERIFICATION TEST OK.