# SDR 2023FA0000187

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 28, 2023
- Submitted: March 30, 2023
- Operation: General aviation
- Aircraft: [N384JW](https://openairdocs.org/aircraft/N384JW), registered now
- Make and model: Lear 60LEAR
- Aircraft serial: 130
- Aircraft time: 10,705 hours, 7,962 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Unknown
- Condition: Unknown
- Location: Unknown
- Stage of operation: TO
- How discovered: 9
- Nature of condition: B
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2023FA0000187

## Discrepancy

ON TAKEOFF CREW REPORTED SMELL OF SMOKE IN THE COCKPIT, THEY RETURNED TO BASE WITHOUT INCIDENT. THEY ALSO REPORTED THE CABIN WOULD NOT DEPRESSURIZE IN THE GROUND. UPON INVESTIGATION, WE FOUND A AFT LH CABIN HEATING DUCT HAD BURST CAUSING THE PLASTIC VACUUM LINE FOR THE OUTFLOW VALVE HAD MELTED WHICH SUPPLIES VACUUM TO THE OUTFLOW VALVE TO OPEN. REPLACED THE HEATING DUCT AND VACUUM LINE. GROUND OPS CHECK GOOD.

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