# SDR ASAA1159912

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 21, 2011
- Submitted: June 28, 2011
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 4,232 hours, 1,359 cycles
- System (JASC): [3197 · Instrument System Wiring](https://openairdocs.org/jasc/3197)
- Part: Connector
- Part number: 1741010201
- Part serial: 005693
- Condition: Malfunctioned
- Location: Cockpit
- Part time: 11,666 hours, 3,807 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA1159912

## Discrepancy

CAPT FMC DISPLAY BLANK.   FMCS CDU BITE SHOWS LEFT CDU FAULTING ON MULTIPLE LEGS IN THE INFLIGHT FAULTS PAGE (LETTER 'B' SHOWN ON FLT LEGS). CONFIRMED NO DEFECTS ON CONNECTORS D2181, D3263, D3267 AND D2179A.  CONFIRMED CONNECTOR D2181 GOT GOOD GROUND ON PINS 31, 26, 25, 11 AND 115VAC ON PIN 30. VERIFIED WIRINGS FROM D3263 TO D2181 AND D3267 TO D2179A ARE GOOD.  REF TO AMM 34-61-01.  REMOVED LT FMCS CDU AND RELOCATED THE RT CDU TO LT POSITION AND INSTALLED NEW FMCS CDU TO RT POSITION.  ACCOMPLISHED FMCS OPS TEST NORMAL IAW TASK 34-61-00-710-801.

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