# SDR ASAA2016072217470

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 22, 2016
- Submitted: July 25, 2016
- Operation: Air carrier
- Aircraft: [N448AS](https://openairdocs.org/aircraft/N448AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36356
- Aircraft time: 1,223 hours, 397 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Display
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: DE
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016072217470

## Discrepancy

DURING DESCENT, FIRST OFFICER`S CDU WENT BLANK AND EVERY LIGHT ON THE KEY PAD ILLUMINATED.  THERE WAS NO VTK AND THE MAPS WERE OTHERWISE NORMAL.  AFTER A WHILE THE CDU DISPLAYED A "BIT: PASS" AND THE CDU RETURNED TO NORMAL.  ACFT GROUNDED.  COULD NOT DUPLICATE,  OPS GOOD IAW AMM 34-61 TASK 804.  GROUND VERIFICATION SUCCESSFUL IAW FIM 34-61 TASK 804.

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