# SDR 20000508SH007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 17, 2000
- Submitted: May 8, 2000
- Operation: General aviation
- Aircraft: [N869CP](https://openairdocs.org/aircraft/N869CP), registered now
- Make and model: Cessna 172R
- Registry model: [Cessna 172R](https://openairdocs.org/model/cessna-172r) (OpenAirDocs)
- Aircraft serial: 17280641
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Light
- Condition: Chafed
- Location: Wiring Bundle
- Part time: 953 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20000508SH007

## Discrepancy

PILOT REPORTED THE RADIO LIGHTS WERE FLICKERING WHILE ENGINE WAS RUNNING.  UPON INSPECTION, WIRING BUNDLE THAT RUNS HORIZONTALLY ACROSS BOTTOM OF INSTRUMENT PANEL WAS FOUND CHAFING ON ''''RADIO INSTRUMENT LIGHT POTENTIOMETER'''' PN S2091-9 (REF:  R1002 I CESSNA WIRING DIAGRAM 33-10-01).  THE CHAFING HAD DAMAGED AND CREATED  BARE SPOTS ON THREE WIRES THAT WERE TRACED TO THE AVIONICS LIGHTING BUS'''' CREATING A SHORT AND CAUSING THE FLICKERING OF LIGHTS.  THE WIRES WERE REPAIRED AND WIRING BUNDLE WAS SECURED AND REPOSITIONED IN A WAY TO PREVENT FURTHER CHAFING ON POTENTIOMETER.  (X)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.