# SDR AC2A2009092283308

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 22, 2009
- Submitted: October 6, 2009
- Operation: Air carrier
- Aircraft: [N139FW](https://openairdocs.org/aircraft/N139FW), registered now
- Make and model: Agusta AB139
- Registry model: [Agusta AB139](https://openairdocs.org/model/agusta-ab139) (OpenAirDocs)
- Aircraft serial: 31022
- Aircraft time: 2,818 hours
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Switch
- Part number: 7079785
- Part serial: 2540
- Condition: Defective
- Location: Hyd System
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AC2A2009092283308

## Discrepancy

IN CRUISE FLIGHT, NR 1 SERVO CAUTION LIGHT CAME ON. CHECKED HYD SCHEMATIC PAGE WHICH SHOWED ALL NT 1 SYS SERVOS IN YELLOW, REFERENCED EMERGENCY PROCEDURES CHECKLIST FOR NR 1 SERVO CAUTION LIGHT. LOWERED LANDING GEAR AND RETURNED TO DEPARTURE.  DEFECTIVE SWITCH.  REPLACED SWITCH.

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