Statuts:	Enquête Officielle
Date:	29 NOV 1963
Heure:	18:33
Type/Sous-type:	Douglas DC-8-54F
Compagnie:	Trans-Canada Air Lines - TCAL
Immatriculation:	CF-TJN
Numéro de série:	45654/179
Année de Fabrication:	1963
Heures de vol:	2174
Moteurs:	4 Pratt & Whitney JT3D-3
Equipage:	victimes: 7 / à bord: 7
Passagers:	victimes: 111 / à bord: 111
Total:	victimes: 118 / à bord: 118
Dégats de l'appareil:	Détruit
Conséquences:	Written off (damaged beyond repair)
Lieu de l'accident:	Ste-Thérèse-de-Blainville, QC (Canada)
Phase de vol:	En vol (ENR)
Nature:	Transport de Passagers Nat.
Aéroport de départ:	Montreal-Dorval International Airport, QC (YUL/CYUL), Canada
Aéroport de destination:	Toronto International Airport, ON (YYZ/CYYZ), Canada
Numéro de vol:	831

Détails:
TCAL Flight 831 from Montreal (YUL) to Toronto (YYZ) was cleared for Toronto at FL290 and was instructed to report climbing through 3000 and 7000 feet. The DC-8 started the takeoff roll on runway 06 at 18:28. Last radio contact with the fight was when the crew reported climbing through 3000 feet, acknowledging a clearance for a left turn to St. Eustache. The aircraft then deviated from its normal flight path about 55deg to the right and began a quick descent. At 18:33, 16.9mls from the airport, the DC-8 struck the ground at a speed of 470-485 knots descending in an angle of about 55deg (+/- 7deg). It was found that the pitch trim compensator actuator was in the extended position and the horizontal stabilizer at setting of 1.9deg nose down on the right hand side and between 1.6deg and 1.7deg nose down on the left hand side.

PROBABLE CAUSE: "The probable cause of this accident could not be determined with certainty. Certain possible causes which were put forward could not be ruled out: 1) Icing of the Pitot system; 2) Failure of the vertical gyro; 3) An unprogrammed and unnoticed extension of the Pitch Trim Compensator."

Sources:
» ICAO Accident Digest No.15 - Volume II, Circular 78-AN/66 (68-79)

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