Figure 11.8 - Platform Control Levers
NOTE:
Slewing, retracting the fly boom and lowering the
lower boom during bleed down must be
acomplished before the upper boom is fully
lowered.
At the completion of this operation the
platform emergency bleed down valve must
be reset by turning it clockwise until it is fully
closed.
Failure to do this will prevent normal
operation of the booms and platform.
❑
Operation from ground control station
1. Open the emergency bleed down valve at
the side of the column (see Figure 11.9) by
turning it anti-clockwise.
Figure 11.9 - Ground Emergency Bleed Down
Valve
2. When the valve is opened the upper boom
will IMMEDIATELY begin to descend.
3. To lower the lower boom operate the lower
boom valve lever (see Figure 11.10).
4. To slew while lowering operate the slew
valve lever (see Figure 11.10).
Figure 11.10 - Ground Control Levers
NOTE:
Slewing and lowering the lower boom during
bleed down must be accomplished before the
upper boom is fully lowered.
At the completion of this operation the
ground emergency bleed down valve must
be reset by turning it clockwise until it is fully
closed.
Failure to do this will prevent normal
operation of the booms and platform.
MHP15/44HD – 12885A
Rev F
page 11 - 3
11. Emergency Operation
SLEW
LOWER
BOOM
UPPER
BOOM
IMPORTANT
IMPORTANT
SLEW
LOWER
BOOM
UPPER
BOOM
FLY
BOOM