# SDR CA190430015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 2019
- Submitted: August 17, 2020
- Operation: General aviation
- Make and model: Aerosp ATR 42-300
- Registry model: [Aerosp ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300) (OpenAirDocs)
- Aircraft time: 49,019 hours
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Check Valve
- Part number: 41125A022221
- Condition: Failed
- Location: A/C System
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA190430015

## Discrepancy

(CAN) WHEN CARRYING OUT A SCHEDULED TASK CARD RIL-2018-03, THE INNER CHECK VALVE AT FIN 6454 HB WAS REMOVED TO FIND THAT BOTH BUTTERFLY FLAPS WERE MISSING. AS IT WAS A SCHEDULE TASK FOR THIS EXACT PROBLEM, I BORESCOPED THE DUCTING DOWNSTREAM OF THE VALVE TO ENSURE THAT THE PARTS WERE NOT HELD UP IN THE DUCT. FROM WHAT I COULD SEE THERE ARE NO PARTS REMAINING. I THEN CONTINUED ON WITH THE REPLACEMENT OF THE UPGRADED CHECK VALVES. (TC# 20190430015)

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