# SDR 97ZZZX3528

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N99330
- Make and model: Doug DC-6A
- Registry model: [Doug DC-6A](https://openairdocs.org/model/douglas-dc-6a) (OpenAirDocs)
- Aircraft serial: 43576
- Engine: Pwa CB3
- System (JASC): [7420 · Ignition Harness (Distribution)](https://openairdocs.org/jasc/7420)
- Part: Primary Lead
- Part number: 1076091316
- Condition: Open Wire
- Location: Nr 4 Engine
- Stage of operation: CR
- Nature of condition: O
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX3528

## Discrepancy

FLT 60 - PRECAUTIONARY SHUT DOWN NR 4 ENGINE AT 0003Z DUE TO ENGINE ROUGHNESS NR 4 ENGINE NR 4 CYLINDER BOTH DISTRIBUTORS HAD AN OPEN AND THEN LOW COMRPESSION PATTERNS.  MAINTENANCE REPLACED Y-LEAD, FRONT PLUG AND SHORT LEAD.  AIRCRAFT RETURNED TO SERVICE.  (X)

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