SDR ASAA2019052729470

Service difficulty report · Warning System · Boeing 737890

Difficulty date: May 27, 2019
Submitted: May 28, 2019
Operation: Air carrier
Aircraft: N512AS
Make and model: Boeing 737890
Aircraft serial: 39043
Aircraft time: 41,416 hours, 12,409 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: DE
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 UPON DESCENT, IT EXTINGUISHED UPON RECALL. GROUNDED - YES. RESET BOTH #1 AND #2 PACK/ZONE TEMPERATURE CONTROLLERS, RAN BITE CHECKS ON BOTH CONTROLLERS, OPS CHECK GOOD IAW AMM 21-61-00-700-806-002, THEN RAN BOTH PACKS (LT AND RT) FOR 30 MINUTES, NO ISSUES, NO PROBLEMS. RAN BITE TEST AGAIN ON #1 AND #2 PACK/ZONE TEMPERATURE CONTROLLERS, OPS CHECK GOOD AGAIN.