Beechcraft Bonanza F33A - Loss of Control and Collision with Terrain
At approximately 1819 Eastern Standard Time a Beechcraft F33A aircraft departed Toronto/Buttonville Municipal Airport for Kingston Airport, Ontario, on a night visual flight rules flight with an instructor and two licenced students on board. Weather en route began to deteriorate and the aircraft was headed back to Toronto/Buttonville Municipal Airport. The aircraft was observed on radar to be westbound in level flight before it turned north and began to climb. The aircraft then turned abruptly to the left and descended; radar contact was lost. The aircraft was subsequently located in a field approximately 10 nautical miles east of the Toronto/Buttonville Municipal Airport. It was destroyed on ground impact and the three occupants were fatally injured. There was no fire and the emergency locator transmitter did not activate.
The instructor was certified and qualified for the flight in accordance with existing regulations. He held a commercial pilot licence with a group 1 instrument rating and was qualified to fly single and multi–engine land aircraft. He had accumulated approximately 900 hours as an instructor. One month prior to the occurrence he was issued a Class 1 Flight Instructor rating.
Records indicate that the aircraft was certified, equipped, and maintained in accordance with existing regulations and approved procedures.
The CYKZ forecast for the time period was generally VFR with temporarily reduced visibility to 5 miles in light rain showers and mist, with broken clouds at 2000 feet.
Environment Canada radar indicated precipitation in the form of rain moving in a southerly direction towards Lake Ontario from Lake Huron. The graphical area forecast (GFA) clouds and weather forecasted isolated towering cumulus clouds, 2 statute miles visibility in light snow showers with a ceiling of 1000 feet agl over and off Lake Huron. The GFA icing turbulence and freezing forecast issued at 1242 and valid at 1900 showed no icing being forecast with a freezing level at 2500 feet asl. A second GFA issued at 1832 and valid at 1900 showed moderate mixed icing between 3000 to 9000 feet asl. This forecast was not available prior to the aircraft departing CYKZ. Although no PIREPS were received prior to the occurrence, aircraft in the vicinity and at an altitude of 2500 agl, were encountering light icing conditions with mixed precipitation, and a temperature of approximately − 2°C.
Although CYKZ and CYOO airports were reporting VFR weather conditions, at the mid–point between the two, there were ground reports of rain mixed with snow with temperatures suitable to icing.
Approximately 11 nautical miles (nm) east of the Oshawa Airport (CYOO), the flight crew reported deteriorating weather conditions and decided to CYKZ.
During the return flight, radar information indicated that the aircraft maintained an altitude of approximately 2300 feet above sea level (asl) and a ground speed of 130 knots As the aircraft headed towards CYKZ, the instructor contacted the tower and requested an approach to runway 33. The clearance was given to the aircraft but no acknowledgment was provided by the instructor. There were no further radio transmissions from the aircraft.
Immediately after this last communication, the radar indicated the aircraft began a climbing right turn to a track of 330°. The airspeed reduced to approximately 90 knots IAS during the climb. The second last radar contact showed the aircraft climbing through an altitude of 2800 feet asl, and turning westbound with a further reduction to 50 knots IAS. The last radar contact at about 1843 indicated the aircraft was descending rapidly through 2100 feet asl with the IAS at 90 knots and increasing. Shortly after this radar contact with the aircraft was lost.
A police helicopter was dispatched to the same area and, using a search light, was able to locate the wreckage.
The subsequent TSB investigation concluded:
- After encountering adverse weather conditions, a climbing right turn was initiated. During the climbing turn, engine power was likely not increased and the airspeed decayed. The angle of attack on the left wing was allowed to increase until it stalled and dropped unexpectedly.
- The location of the flight instruments made it more difficult for the instructor in the right seat to see and react to them and control of the aircraft was not regained before the aircraft struck the ground in a non–survivable impact.