# SDR 2012FA0000515

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 13, 2012
- Submitted: July 27, 2012
- Operation: General aviation
- Aircraft: [N5PG](https://openairdocs.org/aircraft/N5PG), registered now
- Make and model: Gulstm GVSPG550
- Aircraft serial: 5046
- System (JASC): [2710 · Aileron Control System](https://openairdocs.org/jasc/2710)
- Part: Shutoff Valve
- Part number: 1159SCH50117
- Part serial: EFS0978
- Condition: Failed
- Location: Lt Aileron
- Part time: 5,085 hours
- Stage of operation: IN
- 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/2012FA0000515

## Discrepancy

WHILE PERFORMING THE AILERON HARDOVER PREVENTION SYSTEM OPERATIONAL CHECK (HOPS),  LEFT AILERON HYDRAULIC S/O (PILOT-C4) CIRCUIT BREAKER WOULD POP AND HYDRAULIC PRESSURE WAS NOT REMOVED FROM THE AILERON ACTUATOR.  SHUTOFF VALVE WAS FOUND ELECTRICALLY SHORTED.  R & R VALVE, PERFORMED LEAK CHECKS AND OPS CHECKS.  THIS WAS A DORMANT FAILURE THAT WOULD NOT HAVE ALLOWED THE "HOPS SYSTEM" TO SHUTOFF HYDRAULIC PRESSURE TO THE LEFT AILERON IF IT WOULD HAVE HAD A FAULT IN FLIGHT.  CB DIDN`T POP UNITL OPERATIONAL CKS OF THE "HOPS SYSTEM" FORCED THE VALVE TO ACTIVATE.

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