SDR ASAA2013112896569

Service difficulty report · Controller · Boeing 737890

Difficulty date: November 28, 2013
Submitted: December 2, 2013
Operation: Air carrier
Aircraft: N517AS
Make and model: Boeing 737890
Aircraft serial: 35197
Aircraft time: 18,986 hours, 5,732 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Controller
Condition: Malfunctioned
Location: Nr 2 Temp
Stage of operation: AP
How discovered: O
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

DURING FINAL APPROACH, PUSHED RECALL AND RECEIVED A RT PACK LIGHT. RAN CHECKLIST, LIGHT STAYED ILLUMINATED. ACFT GROUNDED. PERFORMED BIT TEST OF BOTH PACK ZONE TEMP CONTROLLERS, NR 2 CONTROLLER SHOWED RAM AIR ACTUATOR FAULT ON BIT TEST. PREVIOUS FLT WAS GO, FULL BIT TEST GO. RESET NR 2 CONTROLLER AND RAN 2 ADDITIONAL BIT TESTS, BOTH GO. SUCCESSFUL GROUND VERIFICATION.