SDR ASAA2020072752932

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: July 25, 2020
Submitted: July 27, 2020
Operation: Air carrier
Aircraft: N462AS
Make and model: Boeing 737990ER
Aircraft serial: 36362
Aircraft time: 23,607 hours, 7,635 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning Light
Condition: False Activation
Location: Left A/C Pack
Stage of operation: TX
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

ON RECALL AFTER START CHECK, LT PACK ILLUMINATED. RESET W/MASTER CAUTION PRESS. GROUNDED - YES. PZTC NR 1 BITE FAULTED "THIS PACK TCV" FIM 21-62 TASK 801, FAULT RESET PER FIM 21-62 TASK 831, OPS BOTH PACKS FOR 30 MINUTES, FULL COOL & FULL WARM, RECALL TEST & PZTC BITE TEST PASSED NO FAULT ACTIVE AMM 21-00-00, CLEARS MEL 21-32B.