# SDR ASAA2022091940028

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 2022
- Submitted: September 23, 2022
- Operation: Air carrier
- Aircraft: [N536AS](https://openairdocs.org/aircraft/N536AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35203
- Aircraft time: 39,185 hours, 11,155 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Speed Switch
- Condition: Intermittent
- Stage of operation: CR
- 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/ASAA2022091940028

## Discrepancy

THE VERTICAL SPEED WHEEL IS INTERMITTENT ON CONTROL PANEL. DURING CLIMB FROM FL360 TO FL370 THE WHEEL WAS UNRESPONSIVE. AFTER ESTABLISHED IN A CLIMB USING LEVEL CHANGE THE V/S MODE SELECT BUTTON WORKED TO SWITCH THE CLIMB INTO V/S MODE BUT THE WHEEL WOULD NOT CHANGE THE RATE. OPERATED NORMALLY LEAVING CRUISE ALTITUDE FOR FINAL DECENT. GROUNDED - YES.   NO FAULTS ON DFCS BITE. ALL MCP TESTS PASS. REFB737-800 FIM 22-11 TASK 801 AND B737-800 AMM 22-00-01.

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