SDR ASAA2020032332490

Service difficulty report · Warning System · Boeing 737890

Difficulty date: March 18, 2020
Submitted: March 24, 2020
Operation: Air carrier
Aircraft: N564AS
Make and model: Boeing 737890
Aircraft serial: 35103
Aircraft time: 51,181 hours, 15,378 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: DE
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

LEFT PACK ILLUMINATED DURING "MASTER CAUTION RECALL" DURING DESCENT CHECK. GROUNDED - YES. REF B737-800 FIM 21-53 TASK 807, #1 PZTC PREV FLT BITE LOGGED "RAM ACT" FAULT. BITE VERIFY TESTED GOOD W/O FAULT. GVI, NO OBSTRUCTIONS IN RAM AIR INLET DUCT. VERIFIED LEFT PACK OPS CHECKED NORMAL ON GND W/O FAULT LIGHTS.