# SDR CWQR02130204008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 4, 2013
- Submitted: February 5, 2013
- Operation: General aviation
- Aircraft: [N376QS](https://openairdocs.org/aircraft/N376QS), registered now
- Make and model: Cessna 680CE
- Aircraft serial: 6800180
- Aircraft time: 4,699 hours
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Heat Exchanger
- Part number: 99145222
- Part serial: S4883T0397
- Condition: Cracked
- Location: Cabin Air
- 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/CWQR02130204008

## Discrepancy

DURING A SCHEDULED INSPECTION,  REPLACED A DUCT ASSY OFF OF THE HEAT EXCHANGER WITH AN IMPROVED DUCT ASSY.  AT DISASSEMBLY, DISCOVERED THAT RIGHT HEAT EXCHANGER HAD CRACKS FROM THE BOLT ATTACH POINTS. THE CRACKS WERE FROM .25 TO .75 IN LENGTH. IT APPEARS THE CRACKS ARE FROM ALL 4 CORNERS OF THE MOUNTING BACK PLATE ON THE HEAT EXCHANGER, THE CORNERS SHOULD HAVE BEEN RADIUSED DURING PRODUCTION.  THIS HAS BEEN REPORTED TO MFG ON SCR 648257.

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