SDR ASAA2020012171890

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: January 17, 2020
Submitted: January 22, 2020
Operation: Air carrier
Aircraft: N559AS
Make and model: Boeing 737890
Aircraft serial: 35178
Aircraft time: 49,617 hours, 14,697 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning Light
Condition: False Activation
Location: Lt A/C Pack
Stage of operation: DE
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

AT TOP OF DESCENT, LEFT PACK LIGHT ILLUMINATED ON MASTER CAUTION RECALL PACK LIGHT EXTINGUISHED WHEN MASTER CAUTION WAS RESET. GROUNDED - YES. ACCOMPLISHED PACK ZONE TEMP CONTROLLER BITE IAW FIM 21-61 TASK 801, FOUND FAULT HISTORY FOR RAM AIR ACT. FAULT CLEARS AFTER RESET. NO OTHER DEFECTS NOTED.