# SDR 9JLA2022081132664

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 29, 2022
- Submitted: August 11, 2022
- Operation: Air carrier
- Aircraft: [N563CS](https://openairdocs.org/aircraft/N563CS), registered now
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5605563
- Aircraft time: 6,058 hours, 4,277 cycles
- System (JASC): [2697 · Fire Protection System Wiring](https://openairdocs.org/jasc/2697)
- Part: Pcb
- Part number: 66188091
- Part serial: 0503
- Condition: Defective
- Stage of operation: IN
- How discovered: O
- Nature of condition: L
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2022081132664

## Discrepancy

THE MAINTENANCE TEAM DISCOVERED DURING PREFLIGHT CHECKS THAT THE APU FIRE LED LIGHT WAS INOP DURING APU FIRE TEST. THE SYSTEM FAULT WAS DEFERRED UNDER MEL 49-20-01 AND OPERATIONS WERE CONTINUED UNTIL MAINTENANCE COULD BE SCHEDULED.  THE MAINTENANCE PROVIDER TROUBLESHOT THE FIRE CONTROL SYSTEM AND REPLACED THE APU MNTR PCB (NZ026) WITH A NEW CONDITION PCB. OPS CHECKS GOOD, APU FIRE DETECT TEST AND APU FIRE SWITCH LIGHT TEST GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE

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