SDR ASAA2014042007547

Service difficulty report · Warning Message · Boeing 737890

Difficulty date: April 20, 2014
Submitted: April 22, 2014
Operation: Air carrier
Aircraft: N560AS
Make and model: Boeing 737890
Aircraft serial: 35179
Aircraft time: 29,336 hours, 8,933 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning Message
Condition: False Activation
Location: Lt A/C Pack
Stage of operation: TX
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 DURING RECALL. RESETS WITH MASTER CAUTION. ACFT GROUNDED. GROUND VERIFICATION CONFIRMS FAULT. ACCOMPLISHED PACK/ZONE TEMPERATURE CONTROLLER BITE BITE SHOWS LT PACK (TCV). CLEARED FAULT. ACCOMPLISHED BITE AND VERIFIED NO FAULT. RAN LT PACK & RT PACK FOR 1 HOUR COMPARED TEMP READINGS, READINGS SHOW SAME. AFTER 1 HOUR REMOVED POWER FROM BOTH PACKS. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE, BITE SHOWS NO FAULTS, IAW MM 21-00-00-800-803, & 21-61-00-700-806-002.