SDR ASAA2016070217211

Service difficulty report · Controller · Boeing 737990ER

Difficulty date: July 2, 2016
Submitted: July 5, 2016
Operation: Air carrier
Aircraft: N471AS
Make and model: Boeing 737990ER
Aircraft serial: 41703
Aircraft time: 6,860 hours, 2,246 cycles
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Condition: Faulted
Location: Cabin Pressure
Stage of operation: IN
How discovered: V
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

FOLLOW-UP TO ACMS REPORTS SHOWING CABIN PRESSURE CONTROLLER FAULTS AT TAKE OFF WITH NO FLIGHT DECK INDICATIONS. ACFT GROUNDED. ACCOMPLISHED FIM 21-31 TASK 801 BITE FOR CPC1 AND CPC2 CONTROLLERS. FAULT HISTORY SHOWED FAULT CODES: 28 LDG/GEAR DISAGREE, 23 DADC NR 2 INVALID, 22 DADC NR 1 INVALID, 17 CABIN ALT 10000 FT, 30 LOW INFL/HI LEAKS, 58 MANUAL SWITCH, 42 CONTROL LRU FAIL, AND 31 ACFT RATE HI. ACCOMPLISHED FIM 21-31 TASK 822 NO MAINTENANCE MESSAGES OR FAULTS FOUND.