Trans-Canada Air Lines Flight 9
Canadair C-4 North Star and Royal Canadian Air Force Harvard Mark II · Mid-air collision
Event
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- Event fatalities
- 37 · all aircraft and ground
- Ground fatalities
- 1
- Occupants
- 36
- Survivors
- 0
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Military
Aircraft 1 · Canadair C-4 North Star
- Aircraft type
- Canadair C-4
- Category
- Airplane · from aircraft type
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- CF-TFW
- Operator
- Trans-Canada Air Lines
- Onboard fatalities
- 35
- Occupants
- 35
- Survivors
- 0
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- None · no survivors
- Route
- From WinnipegTo Vancouver
Aircraft 2 · Harvard Mark II
- Aircraft type
- Harvard MARK
- Category
- Airplane · from aircraft type
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- Unknown
- Operator
- Royal Canadian Air Force
- Onboard fatalities
- 1
- Occupants
- 1
- Survivors
- 0
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- None · no survivors
- Route
- From not recordedTo not recorded
Cause areas
- Personnel issues › Task performance
- Environmental issues › Operating environment
- Environmental issues › Task environment
From the investigation findings the Wikipedia article reports, sorted into the NTSB's cause areas with AI assistance.
Approximate · Estimated position: Moose Jaw, the place the Wikipedia article names. Not the accident site.
From the Wikipedia article
On April 8, 1954, Trans-Canada Air Lines Flight 9, a Canadair C-4 North Star four-engine commercial propliner on a domestic regular scheduled flight, collided in mid air with a Royal Canadian Air Force (RCAF) Harvard Mark II single engine military trainer on a cross-country navigation exercise over Moose Jaw, Saskatchewan.
Both aircraft crashed, a large section of the C-4 North Star fell on a home in the suburbs of Moose Jaw and the Harvard came down on a golf course. All 35 people in the airliner were killed as was the lone occupant of the trainer and one person on the ground. Investigators later stated the most likely cause of the accident was the failure of both pilots to see and avoid each other.
Accident
Flight 9 departed Winnipeg at 08:58 in clear weather and climbed to a cruising altitude of 6,000 feet. While flying westbound at an airspeed of 189 knots and tracking the Green One airway the C-4 North Star crew reported their position over Regina, Saskatchewan at 09:52. This was the last radio transmission from Flight 9. Thomas Thorrat had taken off at 09:57 in a RCAF single engine trainer on a cross country flight, his ninth solo. After departing RCAF Station Moose Jaw 4.5 miles south of the town, Thorrat set his heading to 022 degrees and began climbing to his target altitude of 9,000 feet at 108 knots.
At 10:02 as the Harvard reached 6,000 feet, it collided with the North Star at a combined speed of 261 knots over the northeastern section of Moose Jaw. The damaged North Star began descending like "a falling leaf" according to one witness. Some passengers were ejected from the airliner and fell amongst debris from the fractured aircraft. Approximately eight seconds after the collision, the C-4 North Star's forward fuselage fell on a home, demolishing it and creating an inferno while killing its single occupant. One of the Rolls-Royce Merlin engines was found in the back yard of the home set on fire, while another came to rest on the town's Main Street.
The majority of the heavily damaged Harvard crashed onto a golf course. The pilot's body was found near the cockpit.
Among the passengers aboard Flight 9 was Agar Rodney Adamson, a member of the House of Commons who died alongside his wife in the collision.
Investigation and cause
Investigation
The RCAF, Trans-Canada Airlines, and the Canadian Board of Transport all launched their own investigations into the accident. After examining all available evidence, they determined the most likely accident sequence: The Harvard struck the North Star with its propeller and starboard wing near the airliner's No.1 engine, rupturing the outboard fuel tank and causing an explosion. Training Cadet Thorrat was probably killed at this time. The Harvard then ploughed into the North Star's fuselage between the wing's trailing edge and the passenger door. The inboard fuel tank in the airliner's left wing then exploded, causing the No.1 engine to detach from its mount while the wing was torn from the aircraft near the root. The Harvard's engine separated from its airframe and entered the passenger seating area, while the remaining bulk of the trainer sliced off the airliner's empennage. The severely damaged airliner continued westbound briefly, then pitched nose down and entered an almost vertical spiraling descent, as passengers and luggage were expelled from the large opening in the rear of the fuselage.
The report completed by the Canadian Board of Transport cited three elements likely contributing to causing the accident. Firstly, both aircrews failed to see and avoid each other. While ascending, the Harvard passed through an airway regularly used by commercial aircraft. Also, there was the possibility that the bright yellow Harvard was not seen by the Northstar's crew due to a window post in their line of sight.
The accident was a catalyst for changes in aviation practices in the airspace near Moose Jaw. The Green One airway was diverted to the north of the town to keep airliners at a safe distance from the RCAF base. A new regulation was implemented requiring aircraft flying in opposite directions to maintain separate altitudes. And RCAF Station Moose Jaw changed its flight rules concerning flight over Moose Jaw, mandating that operation take place south of the town.
Text from the Wikipedia article “Trans-Canada Air Lines Flight 9” (revision 1364268713, retrieved 2026-09-18) by its authors, under CC BY-SA 4.0. Extracted as plain text: references, tables, images and some sections are left out. Read the article
Sources
Wikipedia article: Trans-Canada Air Lines Flight 9
- Revision
- 1364268713 · 2026-07-15 · retrieved 2026-09-18
- Wikidata
- Q85810413
- Licence
- Text CC BY-SA 4.0, by the article's authors; Wikidata CC0; town positions GeoNames (CC BY 4.0)
Where each value comes from
- Record
- Wikipedia article "Trans-Canada Air Lines Flight 9" (page 62982460, revision 1364268713)
- Date
- Wikipedia infobox: date
- Place and country
- Wikipedia infobox: site
- Map position
- place the Wikipedia infobox site links (Wikidata coordinates)
- Aircraft, operator and route
- Wikipedia infobox: aircraft type, registration, operator, origin and destination; route airports from the linked airport articles' Wikidata codes (OurAirports)
- Operation
- operator named as an armed force or military unit in the infobox
- Fatalities
- Wikipedia infobox: total_fatalities
- Ground fatalities
- Wikipedia infobox: ground fatalities
- Summary
- Wikipedia infobox: summary
Source notes (1)
- Wikipedia · Facts from the Wikipedia article's infobox and coordinates, not checked against an investigation report. Independent review pending.