SDR ASAA2020102533404

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: October 25, 2020
Submitted: October 26, 2020
Operation: Air carrier
Aircraft: N494AS
Make and model: Boeing 737990ER
Aircraft serial: 41729
Aircraft time: 17,652 hours, 5,515 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Warning Light
Condition: False Activation
Location: Cabin Pressure
Stage of operation: LD
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

PRESSURIZATION AUTO FAIL LAMP ILLUMINATED AFTER LANDING. GROUNDED-YES. VERIFIED FAULT, NR 1 PRESSURE CONTROLLER SHOWS FAULT, MESSAGE OFV LRU FAIL, CLEARED FAULT. ACCOMPLISHED PRESSURE SYSTEM GROUND TEST ON BOTH PRESSURE CONTROLLERS BOTH PASS TEST, NO FAULTS. AUTO FAIL LIGHT EXTINGISHED, REF B737-900 AMM 21-31-00-700-802.