SDR ASAA2015122014348

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: December 20, 2015
Submitted: December 22, 2015
Operation: Air carrier
Aircraft: N431AS
Make and model: Boeing 737990ER
Aircraft serial: 43255
Aircraft time: 8,465 hours, 2,784 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning Light
Condition: False Activation
Location: Lt A/C Pack
Stage of operation: CL
How discovered: O
Nature of condition: N
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 ILLUMINATED ON CLIMBOUT AT ALMOST 8000 FT, TRIP RESET PROCEDURE RESET PACK LIGHT. LEFT PACK LIGHT CAME ON AGAIN AT 16,000 FT. ACFT GROUNDED. PACK RESET. PERFORMED FIM 21-53, TASK 817, LT PACK LIGHT ON. PERFORMED PACK CONTROL BITE CHECK WITH REF TO FIM 21-62, TASK 801, TCV FAULTED. RESET CONTROL AND PERFORMED BITE OF CONTROLLER REF FIM 21-62, TASK 801. PERFORMED GENERAL VISUAL OF LEFT PACK FOR LEAKS AND OPS CHECK. NO DEFECTS NOTED LT PACK, OPS NORMAL.