SDR ASAA2015111113732

Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date: November 11, 2015
Submitted: November 13, 2015
Operation: Air carrier
Aircraft: N457AS
Make and model: Boeing 737990ER
Aircraft serial: 36355
Aircraft time: 6,961 hours, 2,269 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Control Valve
Part number: 3989084
Part serial: 2144
Condition: Failed
Location: Lt A/C Pack
Part time: 6,961 hours, 2,269 cycles
Stage of operation: LD
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

ON LANDING RECALL, LT PACK ILLUMINATED. ACFT GROUNDED. PERFORMED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST, REF AMM 21-61-00-700-806-002, TCV FAILED AFTER BITE TEST ON NR 1 CONTROLLER. REPLACED LT TCV, REF AMM 21-51-10, OPS CHECK GOOD AND PASSED SUBSEQUENT BITE TEST.