SDR ASAA2017121422899

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: December 14, 2017
Submitted: December 15, 2017
Operation: Air carrier
Aircraft: N518AS
Make and model: Boeing 737890
Aircraft serial: 35693
Aircraft time: 34,030 hours, 10,146 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Warning Light
Condition: False Activation
Location: Cabin Temp
Stage of operation: NR
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

CONTROL CABIN ZONE TEMP ILLUMINATES W/MASTER CAUTION LIGHT WHEN RECALL IS DEPRESSED, LIGHT EXTINGUISHES WHEN RESET. GROUNDED - YES. RELEASED PER MEL 21-21F, CONTROL CABIN PRIMARY CONTROL INOP. PERFORMED PACK ZONE TEMP CONTROLLER BITE PER B737-800 AMM 21-61-00-700-806-002, BITE TEST IS GOOD ON BOTH CONTROLLERS, SYSTEM OP'S CHECK GOOD, NO HISTORY IN 30 DAYS.