# SDR 98ZZZX907

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 19, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N957SD
- Make and model: Doug 600N
- Registry model: [Doug 600N](https://openairdocs.org/model/mcdonnell-douglas-helicopter-600n) (OpenAirDocs)
- Aircraft serial: RN011
- System (JASC): [7400 · Ignition System](https://openairdocs.org/jasc/7400)
- Part: Relay Socket
- Part number: VB81KA723
- Condition: Failed
- Location: Eng Ignition
- 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/98ZZZX907

## Discrepancy

DURING GROUND TEST ENGINE RUN, ENG FLAMED OUT AFTER LESS THAN A MINUTE.  FUEL GAUGES INDICATED APPROX 70 POUNDS OF FUEL.  AFTER TANKS TOPPED OFF AND FUEL LINES PURGED, ATTEMPTED RESTART WITHOUT SUCCESS.  FURTHER T/S LOCATED INOP IGNITER FUNCTION.  THIS WAS T/S TO INTERMITTENT IGNITER RELAY SOCKET.  VIBRATION ON WIRING HARNESS WOULD CAUSE RELAYS TO DE-ENERGIZE INTERMITTENTLY.  SEVERAL RELAYS AFFECTED.  CURRENT MD600 MM ARE TOO INADEQUATE TO IDENTIFY THE FUNCTION OF RELAYS.  SUBMITTER SUSPECTS THAT 3 RELAYS ARE:  FADEC START RELAY.  FADEC IGNITION RELAY AND BATTERY HITEMP RELAY.  SUSPECTED FADEC ECU MAY HAVE SHUT ENG DOWN DUE TO LOSS OF SIGNAL LINES FROM INTERMITTENT RELAYS.  TSN:  12.6 HRS.

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