SDR ASAA2021041234571

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: April 12, 2021
Submitted: April 15, 2021
Operation: Air carrier
Aircraft: N581AS
Make and model: Boeing 737890
Aircraft serial: 35188
Aircraft time: 49,270 hours, 14,684 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Warning Light
Condition: False Activation
Location: Lt A/C Pack
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

AFTER ENGINE START, LEFT PACK LIGHT ILLUMINATED AFTER MASTER RECALL, EXTINGUISHES AFTER RESET. GROUNDED - YES. REF B737-800 FIM 21-53 TASK 821, #1 PZTC BITE PREV FLT LOGGED THIS PACK TCV FAULT. RESET FAULT, VERIFIED LEFT PACK OPS CHECKED NORMAL ON GND IN ALL TEMPERATURES RANGE. BOTH PZTC'S BITE VERIFY TESTED GOOD W/O FAULTS.