Ramps and taxiways deteriorated under the aircraft's weight, the fuel system was prone to leaks and icing, and bombing and fire control computers were unreliable.
Her original Pollen Argo Clock mechanical fire-control computer was replaced with a copy of a Vickers Ltd fire-control computer, designated AKUR by the Soviets, as well as a copy of a Sperry stable vertical gyroscope.
The mechanical fire-control computer would have been either a Pollen Argo range clock, which had been bought in 1913, or a domestically designed Erikson system.
These would provide data for the central artillery post to calculate with its imported Pollen Argo Mark V Clock, a mechanical fire-control computer, and then transmit the gun commands via the Geisler transmission system for the gun crew to follow.
One set was mounted in Queen Mary and consisted of a 9 feet Argo rangefinder located on top of the conning tower that fed range data into an Argo Clock Mk IV (a mechanical fire-control computer) located in the transmitting station below the conning tower.
In many cases, lighter engines and boilers were fitted, so that weight and internal volume were freed for other purposes such as improved fire-control computers.
These systems, which can deliver nuclear warheads, incorporate vehicles to launch the missiles and to house command and fire-control computers and other equipment.
Venezuelan AMX-30s received new fuel tanks, increasing the tank's road range to 720 km, while firepower was improved through the adoption of a modern Lansadot MkI fire control system and Ballistic computer from Elbit Systems.
As well as the engine and boiler rooms, other compartments include the transmitting station (housing the ship's Admiralty Fire Control Table, a mechanical computer), the forward steering position and one of Belfasts six-inch shell rooms and magazines.
They fed tracking data to a HACS Mark IV analog computer for high-angle targets and an Admiralty Fire Control Clock Mark VII for low-angle targets.
