SDR ASAA2017071121335

Service difficulty report · Warning Message · Boeing 737890

Difficulty date: July 11, 2017
Submitted: July 13, 2017
Operation: Air carrier
Aircraft: N563AS
Make and model: Boeing 737890
Aircraft serial: 35180
Aircraft time: 40,624 hours, 12,184 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Warning Message
Condition: Intermittent
Location: Lt A/C Pack
Stage of operation: NR
How discovered: V
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 ILLUMINATED ON RECALL, RESETS WITH MASTER CAUTION RESET. ACFT GROUNDED. LEFT PACK/ZONE TEMP CONTROLLER BITE SHOWED NO CURRENT FAULTS, BUT PREV FLT SHOWED FAULT FOR LEFT PACK RAM AIR TEMP SENSOR. VERIFY TEST DID NOT CONFIRM FAULT. DUE TO HISTORY, REMOVED AND REPLACED LEFT PACK RAM AIR TEMP SENSOR T481 IAW AMM 21-51-50-000-801, AND AMM 21-51-50-400-801. OPERATED PACK FOR 15 MINUTES AND PERFORMED BITE OF LEFT PACK/ZONE TEMP CONTROLLER IAW AMM 21-61-00-700-806-002 - ALL TESTS PASS.