# SDR 2001FA0000468

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 29, 2001
- Submitted: November 5, 2001
- Operation: General aviation
- Aircraft: [N421HM](https://openairdocs.org/aircraft/N421HM), registered now
- Make and model: Cessna 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (OpenAirDocs)
- Aircraft serial: 421B0029
- Engine: Cont GTSIO520K
- System (JASC): [2752 · Trailing Edge Flap Actuator](https://openairdocs.org/jasc/2752)
- Part: Gear
- Part number: 51152401
- Part serial: 14879
- Condition: Damaged
- Location: Flap Actuator
- Part time: 3,100 hours
- Stage of operation: AP
- 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/2001FA0000468

## Discrepancy

ON FINAL, THE FLAPS MADE A LOUD POPPING SOUND.  REMOVE FLAP ACTUATOR AND FOUND THAT THE GEAR BOX HAD ONE GEAR WITH THE TEETH MISSING.

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