Midair Collision in Penticton Results in Five Fatalities

Casualties unknown • Penticton, British Columbia, CA

A midair collision between a Mooney M20C and a Cessna 177RG near Penticton, British Columbia, has claimed the lives of all five occupants.

What happened

On a clear day in Penticton, British Columbia, a Mooney M20C was completing a local sightseeing flight with a pilot and three passengers. As the aircraft approached the airport from the northwest, the pilot intended to join the traffic circuit. Simultaneously, a Cessna 177RG, operated by a single pilot, was taxiing for a northbound departure from runway 34.

At approximately 1136 PDT, the two aircraft collided roughly 0.9 nautical mile from the departure end of runway 3 and crashed within the city of Penticton. The impact destroyed both aircraft, resulting in five fatalities and no other injuries.

The investigation

The investigation focused on why the two aircraft were in the same airspace without the pilots being aware of each other's presence. Investigators examined the communication between the pilots and the Penticton Flight Service Station (FSS), as well as the flight paths used by both aircraft.

It was determined that the Mooney pilot's radio check-in was ambiguous and incomplete, failing to clearly state altitude or specific arrival procedures. The FSS specialist interpreted the pilot's reference to "the track" as staying west of the runway centerline, which led to the conclusion that the aircraft would not conflict with the departing Cessna. Furthermore, the Mooney pilot utilized a non-standard circuit-joining technique that crossed through the departure path of runway 34. While the Cessna pilot was communicating with the FSS, it was not confirmed if he had effectively monitored the frequency to identify the inbound Mooney.

Findings

  • Neither pilot identified the other aircraft in time to perform evasive maneuvers.
  • The Mooney pilot's incomplete and ambiguous radio communication prevented the FSS and other pilots from maintaining an accurate mental model of the aircraft's position.
  • The Mooney pilot did not adhere to recommended circuit-joining procedures.
  • The FSS specialist did not provide a specific traffic update to the departing Cessna, nor did the Cessna pilot request one.
  • The Mooney pilot's flight path placed the aircraft directly in the path of the departing Cessna.

Probable cause

The collision was caused by a combination of non-standard circuit-joining procedures by the Mooney pilot and ineffective communication between the pilots and the Flight Service Station, which prevented both pilots from maintaining situational awareness of the conflicting aircraft.

Frequently asked questions

What happened in the 1999-08-20 and Mooney M20C C-GASL accident near Penticton, British Columbia, CA?

A midair collision between a Mooney M20C and a Cessna 177RG near Penticton, British Columbia, has claimed the lives of all five occupants.

What aircraft was involved and where did it happen?

The accident on 1999-08-20 involved a and Mooney M20C C-GASL, operated by Between Cessna 177RG Cardinal C-GWYY, at Penticton, British Columbia, CA.

What was the probable cause of the accident?

The collision was caused by a combination of non-standard circuit-joining procedures by the Mooney pilot and ineffective communication between the pilots and the Flight Service Station, which prevented both pilots from maintaining situational awareness of the conflicting aircraft.

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