# SDR HYIA20261023001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2026
- Submitted: October 24, 2026
- Operation: Air carrier
- Aircraft: [N494BC](https://openairdocs.org/aircraft/N494BC), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0308
- Aircraft time: 40,485 hours, 27,869 cycles
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Heater
- Part number: 8259HL2
- Part serial: HA18030023
- Condition: Cracked
- Part time: 1,199 hours, 4,303 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA20261023001

## Discrepancy

PILOT REPORTED BLACK SMOKE IN THE CABIN. MAINTENANCE INSPECTED C/B PANELS AND AREA UNDER COCKPIT CENTER FLOOR WITH NO DEFECTS NOTED, PERFORMED ENGINE RUNS WITH NO SMOKE NOTED, RAN HEATER AND VERIFIED BLACK SMOKE COMING FROM COCKPIT VENTS AND IN NOSE BAGGAGE COMP. R & R HEATER FOUND CRACK IN COMBUSTION CHAMBER, R & R COMBUSTION BLOWER AND HEATER FUEL PUMP WITH NO FURTHER DEFECTS NOTED.

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