SDR CALA2014071591464

Service difficulty report · Relay · Boeing 747422

Difficulty date: July 11, 2014
Submitted: July 15, 2014
Operation: Air carrier
Aircraft: N104UA
Make and model: Boeing 747422
Aircraft serial: 26902
Aircraft time: 67,591 hours, 7,785 cycles
Engine: Pwa PW4056
Engine time: 200 hours, 43,941 cycles
System (JASC): 7830 · Engine Thrust Reverser
Part: Relay
Condition: Failed
Location: Thrust Reverser
Stage of operation: TO
How discovered: O
Nature of condition: J
Precautionary procedure: C

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

What was found

NUMBER 1 ENG THRUST REVERSER AMBER LIGHT FLICKERED DURING TAXI & THEN CAME ON AT START OF ABORTED TAKEOFF ROLL. MAX SPEED LESS THAN 25 KTS. LIGHT EXTINGUISHED AFTER PULLING OFF RUNWAY, RETURNED TO GATE FOR MX. DEACTIVATED NR 1 ENG REVERSER FOUND MSG 78001 10 DEGREE SWITCH FAIL. NEED TO TROUBLESHOOT IAW FIM 71-00 TASK 829 831. DEACTIVATED NR 1 ENG REVERSER IAW MEL. REPLACED R07640 RELAY, OPERATIONS CHECKED THRUST REVERSER WHILE ENG NR 1 RUNNING, NO FAULT NOTED, OPERATIONS CHECKED OK.