SDR ASAA2016120618956

Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date: December 6, 2016
Submitted: December 12, 2016
Operation: Air carrier
Aircraft: N435AS
Make and model: Boeing 737990ER
Aircraft serial: 43292
Aircraft time: 12,532 hours, 4,103 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Control Valve
Part number: 3989084
Part serial: 9879
Condition: Failed
Location: Rt A/C Pack
Part time: 25,197 hours, 13,677 cycles
Stage of operation: TX
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

AFTER ENGINE START ON RECALL CHECK, RIGHT PACK LIGHT ILLUMINATED, RESETS WITH MASTER CAUTION. ACFT GROUNDED. CONFIRMED FAULT, NR 2 PACK/ ZONE TEMP CONTROLLER BITE, IAW AMM TASK 21-61-00, SHOWS V141 NR 2 TCV FAULT. REMOVED AND REPLACED THE NR 2 TCV IAW AMM TASK 21-51-10, LEAK & OPS CHECKED NORMAL.