# SDR CA150408037

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 8, 2015
- Submitted: August 5, 2015
- Operation: General aviation
- Make and model: Cessna 172L
- Registry model: [Cessna 172L](https://openairdocs.org/model/cessna-172l) (OpenAirDocs)
- Aircraft time: 14,620 hours
- Engine: Lyc O320E2D
- System (JASC): [2340 · Interphone/Passenger Announcement (PA) System](https://openairdocs.org/jasc/2340)
- Part: Intercom
- Part number: SPA400
- Condition: Defective
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA150408037

## Discrepancy

(CAN) SQUELCH KNOB ON INTERCOM WAS NOT ADJUSTING SQUELCH SO THAT PILOT COULD ALWAYS HEAR ENGINE NOISE OVER HEADSET.  REMOVED & REPLACED INTERCOM WITH SAME PN UNIT FROM ANOTHER PLANE.  FUNCTION TESTED SATISFACTORY & RELEASED BACK TO SERVICE.

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