The M242 Fire Control Mount Trailer was an early warning component of the M33 Anti-Aircraft Fire Control System used by Canada and other NATO countries in the 1950s.
The M242 contains the complex AA FCS M33 targeting computer. This computer uses data from the M243 Acquisition Antenna Assembly to track air targets and predict where to shoot with the 90mm M1A2 AA gun.
In addition to the M1A2 90mm gun, the M33 system was the fire-control system for the Ajax missile. Canada retired the system when the M1A2 90mm gun went out of service in 1960.
Radar Range: 28,000 yards (25,630 metres)
Detachment: 3 fire control trailers, generator trailer, 4 towing vehicles, light truck and 10 Gunners