# SDR ASAA2023021441953

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 14, 2023
- Submitted: February 16, 2023
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 57,993 hours, 17,307 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023021441953

## Discrepancy

BOTH FMC/ CDU UNITS REQUIRE MULTIPLE PUSHED OF SAME BUTTONS TO COMMUNICATE USING CPDLC. EX. USING LINE SELECT KEYS TO REPORT BACK ON COURSE ENROUTE REQUIRED MULTIPLE PUSHES TO WORK. GROUNDED - YES. PERFORMED CPDLC FUNCTIONAL TEST PER B737-800 AMM 33 34-61-00-720-899- ALL TESTS PASS. PERFORMED TEST OF LEFT AND RIGHT MCDU KEYPADS PER B737-800 FIM 34-61 TASK 801- ALL TESTS PASS.

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