ASN Wikibase Occurrence # 217248
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| Date: | Monday 30 August 1993 |
| Time: | 06:15 |
| Type: |  Cessna 414A Chancellor |
| Owner/operator: | Fisher Sand And Gravel Co. |
| Registration: | N36990 |
| MSN: | 414A0504 |
| Year of manufacture: | 1980 |
| Engine model: | CONTINENTAL TSIO-520 |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Minor |
| Category: | Accident |
| Location: | Dickinson, ND -
 United States of America
|
| Phase: | Taxi |
| Nature: | Executive |
| Departure airport: | |
| Mitchell, SD (MHE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE CORPORATE TWIN-ENGINE AIRPLANE WAS TAXIING FOR DEPARTURE WHEN THE PILOT TURNED THE COCKPIT/CABIN HEATER ON. APPROXIMATELY FIVE MINUTES LATER AN EXPLOSION OCCURRED WHICH CAUSED TWO OF THE THREE BAGGAGE DOORS TO COMPLETELY SEPARATE FROM THE AIRFRAME. A THIRD DOOR REMAINED ATTACHED WITH BY A HINGE. DURING THE ON-SCENE INVESTIGATION EXPLOSION/FLAME DAMAGE TO THE BAGGAGE COMPARTMENT INTERIOR AND THE INTERIOR SIDES OF THE DOORS WAS NOT OBSERVED. INSPECTION OF THE HEATER UNIT REVEALED THE COMBUSTION AIR PRESSURE SWITCH WOULD NOT INTERRUPT ELECTRICAL POWER TO THE FUEL SOLENOID VALVE WHEN AIR PRESSURE WAS REMOVED FROM IT. THE SOLENOID ALLOWED FUEL TO ENTER THE HEATER UNTIL CONDITIONS ALLOWED THE EXPLOSION.
Probable Cause: the total failure of the airplane's heater system combustion air pressure safety switch.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001211X13086&key=1
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Nov-2018 08:43 | ASN Update Bot | Added |
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