SDR ASAA2018080125608

Service difficulty report · Warning System · Boeing 737890

Difficulty date: July 30, 2018
Submitted: August 1, 2018
Operation: Air carrier
Aircraft: N590AS
Make and model: Boeing 737890
Aircraft serial: 35687
Aircraft time: 40,090 hours, 12,148 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: AP
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

PRESSURIZATION CONTROL PANEL "AUTO FAIL" LIGHT ILLUMINATED ON SHORT FINAL APPROACH. GROUNDED - YES. VERIFIED DISCREPANCY. FOUND NR 1 CONTROLLER FAULTING LRU CODE 57. PERFORMED FIM 21-31 TASK 801 (DCPC) BITE PROCEDURE. NO ACTIVE FAULTS FOUND. SYS RESET. FAULT CLEARED. PERFORMED FIM 21-31 TASK 824 CABIN PRESSURE CONTROLLER FAIL - FAULT ISOLATION . NO NEW FAULTS LOGGED. PERFORMED AMM TASK 21-31-00-700-802 PRESSURIZATION SYSTEM GROUND TEST ON NR 1 CONTROLLER. ALL TESTS PASSED.