SDR ASAA2019022628301

Service difficulty report · Wire · Boeing 737890

Difficulty date: February 22, 2019
Submitted: March 1, 2019
Operation: Air carrier
Aircraft: N519AS
Make and model: Boeing 737890
Aircraft serial: 36482
Aircraft time: 38,120 hours, 11,375 cycles
System (JASC): 2197 · Air Conditioning System Wiring
Part: Wire
Condition: Disconnected
Location: Sensor Fan
Stage of operation: NR
How discovered: 9
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FWD CAB TEMP CONTROL WILL NOT MANAGE CABIN TEMP. CABIN TEMP SPIKES HOT/COLD WITH SMALL INPUTS TO THE KNOB. PLACED IN THE OFF POSITION CABIN TEMP IS ACCEPTABLE. GROUNDED - YES. CONFIRMED FAULT, FWD PASS CABIN TEMP SENSOR FAN INOP. REMOVED CEILING PANEL, FOUND PLASTIC ZIP-TIE AT GD3858-AC PULLING A WIRE OUT. REMOVED ZIP-TIE & SECURED WIRE AT GD3858-AC REF B737-800 WDM 21-61-13, FAN NOW WORKS.