# SDR 99ZZZX299

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N441ER](https://openairdocs.org/aircraft/N441ER), registered now
- Make and model: Cessna 172R
- Registry model: [Cessna 172R](https://openairdocs.org/model/cessna-172r) (OpenAirDocs)
- Aircraft serial: 17280660
- System (JASC): [2460 · DC Power Distribution System](https://openairdocs.org/jasc/2460)
- Part: Mcu
- Part number: MC012
- Condition: Malfunctioned
- Location: E/E Bay
- Part time: 104 hours
- Component: Lamar
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX299

## Discrepancy

CIRCUIT PROTECTION FOR AVIONICS IS PROVIDED BY TWO 30-AMP AUTOMOTIVE TYPE SPADE FUSES PLUGGED INTO A 'FUSE PANEL'.  FUSE PANEL IS HOUSED IN A 'J' BOX CALLED THE 'MASTER CONTROL UNIT'.  PROBLEM IS SPECIFIC TO 'FUSE PANEL' BURNING METAL SPADE TERMINALS OF 30-AMP FUSE RENDERING AVIONICS INOPERABLE.  EXACT CAUSE IS NOT KNOWN,  SUBMITTER STATED REPLACING FUSE DOES NOT CORRECT PROBLEM.  ON A FLEET OF SIXTY LIKE AIRCRAFT, THIS PROBLEM IS OCCURRING SEVERAL TIMES A WEEK.

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