SDR ASAA2015110313617

Service difficulty report · Control Valve · Boeing 737890

Difficulty date: November 3, 2015
Submitted: November 5, 2015
Operation: Air carrier
Aircraft: N518AS
Make and model: Boeing 737890
Aircraft serial: 35693
Aircraft time: 26,057 hours, 7,787 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Control Valve
Part number: 3989083
Part serial: 1458
Condition: Failed
Location: Lt A/C Pack
Part time: 74,377 hours, 36,330 cycles
Stage of operation: NR
How discovered: 9
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

LEFT PACK LIGHT ILLUMINATES AFTER MASTER CAUTION RECALL. EXTINGUSHES WITH MASTER CAUTION RESET, ACFT GROUNDED. BITE CHECK OF NR 1 PACK/ZONE TEMP CONTROLLER, M 1442, FAULTS TCV THIS PACK. REPLACED LT PACK TCV, V 139. INSTALLATION TEST PASSES. NO LEAKS NOTED, REF AMM 21-51-10/401.