# SDR ASAA2016041516416

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 15, 2016
- Submitted: April 18, 2016
- Operation: Air carrier
- Aircraft: [N506AS](https://openairdocs.org/aircraft/N506AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35690
- Aircraft time: 30,258 hours, 9,238 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Control Unit
- Condition: Malfunctioned
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016041516416

## Discrepancy

UPON BLOCKING, THE EXTERNAL POWER DROPPED OFF ABOUT 4 TIMES . THE APU STARTED AND PUT ON THE BUSES.  RT MCDU WENT BLANK AND WOULD NOT REPOWER UP.  ACFT GROUNDED.  FIM 34-61, TASK 809, RESET POWER TO F/O`S MCDU.  MDCU POWER RESTARTED.  ACFT RELEASED TO ETOPS SERVICE.

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