# SDR 99ZZZX395

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 16, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N220TW
- Make and model: Piagio P180
- Aircraft serial: 1018
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Switch
- Condition: Malfunctioned
- Location: Te Flap
- Part time: 1,134 hours
- Component: C13606645
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX395

## Discrepancy

FLAPS 'LOCKED OUT' IN THE MID-POSITION WHILE MOVING FROM THE FULL DOWN TO UP POSITION.  THE MALFUNCTION WAS DUE TO A HIGH RESISTANCE IN THE INTERNAL MICROSWITCHES OF THE FLAP DRIVE UNIT.  THE AIRCRAFT MANUFACTURER IS AWARE OF THE PROBLEM. THE FLAP DRIVE UNIT WAS REPLACED BY AN IMPROVED VERSION.  P/N C136066-45, S/N 1051 REMOVED.  P/N C152550-1, S/N 1007 FITTED.  FULL FUNCTIONAL CHECKS CHECK OUT, AIRCRAFT FLOWN.  NO FURTHER REPORTED DEFECTS.

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