ASN Wikibase Occurrence # 23270
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| Date: | Tuesday 9 August 2005 |
| Time: | 19:20 |
| Type: |  Lancair IV-P |
| Owner/operator: | Private |
| Registration: | N750F |
| MSN: | 493 |
| Year of manufacture: | 2000 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | 7 NM SE of Sundre, Alberta -
 Canada
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Calgary, AB |
| Grande Prairie, AB | |
| Investigating agency: | TSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The Lancair IV-P, N750F, had departed Calgary, AB at 1904 MDT on an IFR flight plan to Grand Prairie, AB. The aircraft levelled off at the flight planned altitude of FL 200 at 1917. Approximately 1 minute later, radar data showed the aircraft entering at 900 fpm descent which increased to 14,500 fpm by the time the aircraft reached an altitude of 14,700 feet. The SSR radar return was lost at 1919 at approximately 14,500 feet and only primary returns were recorded until 1920. The aircraft fuselage and left wing spar impacted the ground approximately 20 km SE of Sundre, AB. The right wing, left wing skins, and pieces of the tail section were located over a 2.5 km area southwest of the main wreckage site. The pilot and passenger were fatally injured and there was no post impact fire.
Findings as to Causes and Contributing Factors
1. The aircraft entered the tops of towering cumulus clouds and most likely accumulated enough airframe ice to prevent the aircraft from accelerating in cruise flight, with the reduction in performance eventually leading to an aerodynamic stall.
2. For unknown reasons, the pilot was unable to recover the aircraft from the aerodynamic stall and ensuing dive, and the airframe broke up due to the excessive speed reached in the dive.
Accident investigation:
 |
|
Sources:
2005C1789
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 25-Oct-2023 14:48 | harro | Updated |
Corrections or additions? ... Edit this accident description
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