SDR ASAA2018052124743

Service difficulty report · Warning System · Boeing 737990ER

Difficulty date: May 21, 2018
Submitted: May 23, 2018
Operation: Air carrier
Aircraft: N492AS
Make and model: Boeing 737990ER
Aircraft serial: 44110
Aircraft time: 9,895 hours, 3,387 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: DE
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

ON DESCENT CHECK, RECALL ILLUMINATED CONT ZONE TEMP CAUTION LIGHT, LIGHT EXTINGUISHED WITH MASTER CAUTION RESET. GROUNDED - YES. RELEASED PER MEL 21-21F, CONT CABIN ZONE TEMP INOP. ACCOMPLISHED PACK FLOW TEMP CONTROLLER BITE TEST PER AMM TASK 21-61-00 AND TCV FAULT CLEARED, SUBSEQUENT BITE TEST, NO FAULT, OPS CK GOOD.