# SDR 96ZZZX4178

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 24, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Rockwell Collins Inc, repair station KI2R953K](https://openairdocs.org/faa-repair-station/KI2R953K/rockwell-collins-inc.md) (OpenAirDocs)
- Aircraft: N85CR
- Make and model: Beech 400A
- Registry model: [Beech 400A](https://openairdocs.org/model/hawker-beechcraft-400a) (OpenAirDocs)
- Aircraft serial: RK22
- System (JASC): [7830 · Engine Thrust Reverser](https://openairdocs.org/jasc/7830)
- Part: Switch
- Part number: 650161
- Condition: Failed
- Location: T/R Deploy
- Part time: 1,220 hours
- Component: Rohr, 225012509
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX4178

## Discrepancy

THRUST REVERSER CONTROL CIRCUIT BREAKER ON LEFT SIDE 'POPPED' WHEN REVERSERS WERE ACTUATED.  TROUBLESHOOTING DETERMINED THRUST REVERSER CONTROL BOX, P/N 45A5888656-5, HAD BURNT RESISTOR AND TRANSISTOR IN THE THROTTLE T/R LOCK HOLDING SOLENOID CIRCUITS.  T/R THROTTLE LOCK SOLENOID MEASURED AND FOUND RESISTANCE TO BE EXTREMELY LOW.  (P/N 18578-01.)  FURTHER TROUBLESHOOTING DETERMINED REVERSER DEPLOY LIMIT SWITCH TO HAVE STUCK CONTACTS THAT, CONSEQUENTLY, KEPT LOCK SOLENOID ACTUATED.

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