# SDR 9JLA2019021316336

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 8, 2018
- Submitted: February 13, 2019
- Operation: Air carrier
- Aircraft: [N359V](https://openairdocs.org/aircraft/N359V), registered now
- Make and model: Cndair CL6002B16
- Aircraft serial: 5349
- Aircraft time: 9,667 hours, 5,349 cycles
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Relay
- Part number: HA4A039
- Condition: Defective
- Location: Electrical Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2019021316336

## Discrepancy

THE FLIGHT CREW REPORTED THAT DURING FLIGHT THE AC ESS BUS CAUTION MESSAGE ILLUMINATED IN FLIGHT. TROUBLESHOOTING DETERMINED THE CENTRAL BUS RELAY P/N HA4A039 AND VOLTAGE SENSOR RELAY B0804074-001 TO BE DEFECTIVE. INSTALLED NEW RELAYS. FUNCTIONAL CHECKS SATISFACTORY.

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