# SDR ASAA12511587

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2012
- Submitted: May 25, 2012
- Operation: Air carrier
- Aircraft: [N560AS](https://openairdocs.org/aircraft/N560AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35179
- Aircraft time: 22,233 hours, 6,887 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Cdu
- Condition: Malfunctioned
- Location: Lt Fmc
- Stage of operation: CR
- 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/ASAA12511587

## Discrepancy

APPROACHING THE CRITICAL POINT, NR 1 CDU WENT COMPLETELY BLANK FOR 20 SECONDS. IT CAME BACK IN A BITE TEST MODE AND THEN RETURNED TO NORMAL FUNCTION.  NO PILOT ACTIONS WERE TAKEN DURING THIS EVENT.  ACFT GROUNDED.  REMOVED LT FMC CDU REF 34-61-01.  CLEANED COOLING VENT IAW 34-61-01.  REINSTALLED LT FMC CDU 34-61-01.  OPS CHECK REF 34-61-00-710-801.  SYS CHECKED NORMAL.

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