# SDR DXTA2021082547550

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 23, 2021
- Submitted: August 25, 2021
- Operation: Air carrier
- Aircraft: N375QS
- Make and model: Cessna 680CE
- Aircraft serial: 6800230
- Aircraft time: 12,013 hours, 7,901 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Relay
- Part number: M8353615022L
- Condition: Abnormal
- Location: Emergency Lights
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2021082547550

## Discrepancy

EMERGENCY LIGHTING: EMERGENCY LIGHTING OFF FUNCTION INOP. UNABLE TO EXTINGUISH INTERIOR OR EXTERIOR EMERGENCY LIGHTING THROUGH NORMAL SWITCH FUNCTIONS. LIGHTS REMAIN ON EVEN WITH BOTH MAIN BATTERIES DISCONNECTED.   TROUBLESHOT DISCREPANCY TO A BAD PILOT CONTROL EMERGENCY LIGHT RELAY. REMOVED RELAY PN M83536/15-022L NSN AND INSTALLED NEW CUSTOMER SUPPLIED RELAY PN M83536/15-022L NSN AS REQUIRED, CHARGED INSTALLED EMRGENCY BATTERY PACKS. OPS CHECK GOOD WITH NO FURTHER DEFECTS NOTED. REF CE680 MM 33-50-10.

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