SDR ASAA2014101809404

Service difficulty report · Controller · Boeing 737990ER

Difficulty date: October 18, 2014
Submitted: October 23, 2014
Operation: Air carrier
Aircraft: N423AS
Make and model: Boeing 737990ER
Aircraft serial: 35206
Aircraft time: 5,906 hours, 1,872 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Controller
Part number: 3989084
Part serial: 21067
Condition: Malfunctioned
Location: Cabin Temp
Part time: 5,906 hours, 1,872 cycles
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

CABIN ZONE TEMP CONTROLLER LIGHT ON RECALL, LIGHT GOES OUT ON MASTER CAUTION RESET. ACFT GROUNDED. ACCOMPLISHED BITE ZONE TEMP CONTROLLER BITES, TEST 1, NO FAULTS. CONTROLLER 2 SHOWS FLT FAULT TRIM AIR MODIFIED VALVE, V143, REF MM 21-61-00-700-806-002 REPLACED THE CONTROLLER. CABIN TRIM AIR MODIFIED VALVE ASSY REF MM 21-61-21.