# SDR 98ZZZX2350

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 22, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Semco CHALLENGER
- Registry model: [Semco CHALLENGER](https://openairdocs.org/model/semco-balloon-challenger) (OpenAirDocs)
- System (JASC): [2430 · DC Generating System](https://openairdocs.org/jasc/2430)
- Part: Insulator
- Part number: 43772
- Condition: Shorted
- Location: Power Supply
- 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/98ZZZX2350

## Discrepancy

POWER SUPPLY S/N'S 057R, 116R, 139R, 173R, 259R, AND 328R FOUND Q5 DAMAGED BY SHORT-CIRCUIT (S/N 173R).  INSPECTION REVEALED MICA INSULATOR MIS-POSITIONED UNDER Q5 PERMITTING COLLECTOR TO SHORT TO CHASSIS (GROUND).  INSPECTION OF ADJACENT COMPONENTS (CR19 AND Q6) REVEALED SAME CONDITION ALTHOUGH NO SHORT-CIRCUITS, YET.  INSP OF REMAINING 5 UNITS REVEALED SAME CONDITION, ALTHOUGH NO SHORT-CIRCUITS, YET.  IT IS UNKNOWN WHETHER THESE COMPONENTS (Q5, Q6, CR19) OR RESPECTIVE INSULATORS ARE ORIGINAL (FACTORY) OR ARE IN-SERVICE REPLACEMENTS.  SUBMITTER RECOMMENDED MORE CARE BE GIVEN TO PROPER PLACEMENT OF MICA INSULATORS UNDER COMPONENTS.

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