MAINTENANCE
5-4 / Mid-Mount Ascendant Aerial Tower
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Ladder will not lower into the boom
support.
Collision Avoidance message exists. Check the position and location of
the aerial. A Collision Avoidance
message indicates that the aerial
movement was halted to prevent
moving into an unsafe area.
Retract Aerial message exists.
Ensure that the aerial is fully
retracted. A Retract Aerial message
indicates the Collision Avoidance
system was activated and aerial
movement was halted to prevent
moving into an unsafe area.
Check for Ladder Aligned for
Stowing message.
Ensure that ladder is aligned for
stowing and check the Command
Zone Information Center (CZIC) for
a Ladder Aligned for Stowing
message.
If ladder is aligned for stowing:
Have one operator hold the override
switch while the operator at the
turntable stows the ladder.
As a last resort, use the manual
aerial controls to stow the ladder.
Table 5-1: Troubleshooting Guide (Continued)
Problem
Probable Cause
Solution