# Incident 20090220004129I: Skrsky S76C, Worcester, MA, February 20, 2009

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: February 20, 2009, 17:46 local time
- Place: Worcester, MA
- Damage: No damage
- Phase of flight: Cruise/Level Flight
- Operating rules: General operating rules (Part 91)
- Location: 42.2626° N, 71.8023° W: Placed by OpenAirDocs: center of Worcester, MA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.2626&lon=-71.8023&mi=10
- Aircraft: N101MM (not matched to a registry record)
- Reported make and model: SKRSKY S76C
- People aboard: 3
- Fatal injuries: 0
- Other injuries: 0
- Pilot flight hours: 0 total, 0 in this make and model, 0 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20090220004129I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) DURING CRUISE FLIGHT FROM SPRINGFIELD, MA TO BEDFORD, MA THE AIRCRAFT DIVERTED TO WORCESTER REGIONAL AIRPORT (ORH) BECAUSE OF SMOKE IN THE COCKPIT AND CABIN.  THE COCKPIT, CABIN AND CLIMATE CONTROL SYSTEM (C4 SYSTEM) WAS ON AND WORKING PROPERLY.  ENGINE ANTI-ICE WAS TURNED ON FOR SNOW.  IMMEDIATELY THE AUTO FAIL LIGHT CAME ON FOR THE C4 SYSTEM WAS TURNED OFF.  AFTER ABOUT 30 TO 45 SECONDS, WITH THE TEMPERATURE IN THE CABIN DECREASING, THE BLEED AIR SWITCH WAS TURNED ON AND THE CABIN HEAT SWITCH SET TO LOW.  THE CABIN TEMPERATURE STABILIZED FOR ABOUT 30 SECONDS AND THEN SHOT UP TO INDICATE 75 DEGREES.  BOTH PILOT AND CO-PILOT SMELLED AND THEN SAW SMOKE IN THE COCKPIT.  THE PASSENGER REPORTED SMOKE IN CABIN.  ALL HEATING SWITCHES AND ENGINE ANTI-ICE SWITCHES WERE TURNED OFF IMMEDIATELLY.  THE SMOKE AND SMELL THEN DISSIPATED.  THE DETERMINATION WAS MADE THAT CABIN VARIABLE SIZE ORIFICE (VSO) HAD ALLOWED AN EXCESSIVE AMOUNT OF HEAT THROUGH THE DUCT WORK, OVERHEATING IT.  THIS HIGHER THAN NORMAL TEMPERATURE CAUSED THE DEBRIS, GRIME AND/OR OIL SEDIMENT TO FUME AND ENTER THE AIRCRAFT INTERIOR THROUGH THE C4 SYSTEM.  THE VSO ASSEMBLY WAS REPLACED AND ALL COMPONENTS OF THE C4 SYSTEM WERE CLEANED.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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