Section II. PROCEDURES
If through an electrical fault, control of the launcher with the chest pack is not
possible then the back up mode of operation can be adopted.
Dependent on the level of the electrical failure hydraulic power is developed in one
of the following ways, in order of preference:
With the launch vehicle's engine running, select position 2 on the four position
rotary switch in the cab and press reset on the Interface Panel, ensuring that
the PTO engages by observing whether the PTO ENGAGED AT PRESSURE
caption is illuminated.
With the launch vehicle's engine running, on the Interface Panel, depress the
PTO OVERRIDE "ON" switch (and ensure that the PTO engages. If no
electrical circuits are live, the PTO pressure switch will not indicate PTO
ENGAGED AT PRESSURE.
(3) Cross connect the launch vehicle to a slave vehicle.
Figure 7. 3 Location of PTO Override Buttons