Upper A-Frame Transverse Beam

TM 5-5420-279-23

circumstances, such as loss of electrical power, direct manual operation is possible from the

selector valve located at the rear of the chassis in conjunction with manual operation of the

cylinder solenoids.

An emergency stop button is located adjacent to the selector switches and on the tail lift

handset. The maximum height of the platform above ground level is 4 ft 10 in (1.47 m).

Fig 1.3 Tail Lift

1-10-8

A-Frame

The A-Frame is of steel construction and when deployed, stabilizes the rear of the vehicle and

provides a level home bank platform for the launch frame, launch beam and bridging modules. It

comprises upper and lower transverse beams, foldout stabilizer legs, hydraulic cylinders and

hydraulic control valves.

1-10-9

Upper A-Frame Transverse Beam

The upper A-Frame transverse beam spans the rear of the vehicle, supports the launch

frame with its associated equipment and provides the upper hinge points for the outer A-Frame

legs.

When the A-Frame is deployed, the beam is pinned at its hinge position to the outer legs

during erection of the launch beam and bridge modules.

The launch beam and the launch frame, together with its associated equipment, move

vertically on the outer A-Frame legs by the operation of hydraulic cylinders on the upper section

1-9