SDR ASAA2016040716299

Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date: April 7, 2016
Submitted: April 11, 2016
Operation: Air carrier
Aircraft: N409AS
Make and model: Boeing 737990ER
Aircraft serial: 41733
Aircraft time: 12,820 hours, 4,185 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Control Valve
Part number: 3989083
Part serial: 18782
Condition: Failed
Location: Temperature
Part time: 12,828 hours, 4,188 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

UPON RECALL, LT PACK LIGHT ILLUMINATED, FOLLOWED QRH PRESSED MASTER CAUTION TO RESET, PACK LIGHT EXTINGUISHED. ACFT GROUNDED. LT PACK/ZONE TEMP CONTROLLER, M1442 FAULTED, THIS PACK TCV. REPLACED LT PACK TEMP CONTROL VALVE, V139 ZONE TEMP BITE PASSES. INSTALLATION TEST PASSES, REF AMM 21-51-00/401.