TM-5-5420-279-10
4.17.1.20 Set the 4-position mode selector rotary switch from 3 to position 2. Make sure the
PTO engages and the engine rpm goes to high idle.
CAUTION
As the weight of the A-frame is lowered onto the twist locks the vehicle suspension will
lower, and may cause the tail lift to contact the bridge. Bridge contact with the tail lift
must be avoided to prevent damage to the tail lift.
4.17.1.21 Operate both A-frame stabilizer leg raise controls to allow the pins to be removed.
4.17.1.22 Operate both A-frame stabilizer leg lower controls and lower the slide frame onto the
chassis twist-to-lock fasteners. Make sure the stabilizer leg hydraulic cylinders
operate and retract the legs.
4.17.1.23 Adjust the height of the tail lift as required to ensure that it does not come into contact
with either the far bank support or the bridge, while the A-frame is being lowered onto
the twist locks.
4.17.1.24 Make sure the twist-to-lock fasteners on the slide frame are correctly located.
Continue to retract the stabilizer legs until they are fully retracted and the feet are
clear of the ground. Install the locking pins in the retracted A-frame stabilizer legs
from the outside in.
4.17.1.25 As the A-frame is lowered from its maximum height the slide frame may partially open
causing the twist to lock fasteners not to align. If this occurs lower both A-frame
stabilizer legs and repeat steps 4.17.1.19 to 4.17.1.24.
4.17.1.26 Engage the twist-to-lock fasteners on the slide frame.
NOTE
The chest pack must not be disconnected from the launch vehicle until this point. If the
chest pack is disconnected before this point and the four position switch in the vehicle
cab is in position 4, the emergency stop system will operate and shut down the launch
vehicle operating systems.
4.17.2.1
Set the chest pack to OFF.
4.17.2.2
Disconnect the chest pack umbilical cable from the chest pack and the launch vehicle
connection point. Fit dust covers to the electrical connections at the chest pack and
the launch vehicle ends of the umbilical cable.
4.17.2.3
Coil the chest pack umbilical cable and return the cable and the chest pack to their
stowage position.
4.17.2.4
On the tail lift pendant, press and hold the LIFT UP switch to raise the tail lift platform
to support the far bank support bearing pads. Make sure the lift hydraulic cylinders
extend to raise the tail lift platform.
4.17.2.5
Disconnect the tail lift umbilical cable from the launch vehicle connection point. Fit
dust covers to the electrical connections at the umbilical cable end and the launch
vehicle.
