# SDR CALA2014071591464

- Type: Service difficulty report (as reported; unverified)
- 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](https://openairdocs.org/jasc/7830)
- Part: Relay
- Condition: Failed
- Location: Thrust Reverser
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2014071591464

## Discrepancy

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.

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