# SDR ASAA2018061845082

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 14, 2018
- Submitted: June 18, 2018
- Operation: Air carrier
- Aircraft: [N514AS](https://openairdocs.org/aircraft/N514AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35193
- Aircraft time: 37,251 hours, 11,187 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fan
- Condition: Obstructed
- Location: Display
- Stage of operation: CR
- How discovered: O
- Nature of condition: C
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018061845082

## Discrepancy

FIRST OFFICER`S MCDU BLANKED OUT AT LEAST FOUR TIMES OVER A PERIOD OF LESS THAN ONE HOUR. DISPLAYED FAIL LIGHT.  SEEMED TO RUN A BIT TEST AND RECOVER TEMPORARILY.  NO OTHER CHANGES NOTED.  OPERATED NORMALLY AFTERWARD.  ACFT GROUNDED.   FAULT CODE 346-040-32 INITIAL INSPECTION, RT MCDU WORKING,  LCD TEMP WAS READING 36 DEGREES C. REMOVED CDU AND FOUND DUST BLOCKAGE IN COOLING VENTS. CLEANED COOLING VENTS IAW AMM 34-61-01-100-801, VERIFIED EQUIPMENT COOLING WORKING PROPERLY TO MCDU RACK. REINSTALLED AND RAN FOR 30 MINUTES, NO DEFECTS NOTED. LCD TEMP DROPPED TO 28 DEGREES C. NO HISTORY LAST 30 DAYS.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.