SELECT
INRIGGER
TAGLINE
SELECT
STEERING
SELECT
REV/LOWER
DOWN
OUT
ON
LEFT
HOIST
FWD/RAISE
DIRECTION
LUFF
TRAVEL
RIGHT
PENDANT
SELECTED
EMERGENCY
SELECT
SELECT
STEERING
STOP
HOIST
ON
LEFT
LUFF
TRAVEL
RIGHT
FRONT VIEW
TOP VIEW
ASf13003
Figure 13-3.--Pendant control box.
safety feature in case of malfunction during lifting
wheel assembly is removed from a smaller piece of
operations. The brake is electrically released when
support equipment. Because the wheel assembly
power is returned.
weighs 2,107 pounds, a forklift and sling must be used
to remove it from the crane. Once removed from the
The hook, or main hoist, is controlled by the
crane, the wheel assembly must be secured to the
operator and is powered by the same dc motor as the
forklift to keep it from breaking away.
luff control. The main hook has a limiting switch that
protects the hook, cable, and pulleys from damage by
Prior to removing a wheel assembly, be sure that
preventing the hook from traveling into the pulleys. The
you have the jack and chocks placed correctly. For
hydraulic brake system of the luff and hoisting
detailed instructions, refer to the technical manual for
differential is released upon selection of the operation
the equipment and to Support Equipment Tire and
needed at the time. This allows both systems to use one
Wheel Assemblies, NAVAIR 17-1-129.
motor and one set of gears.
NOTE: The AACC crash crane has no coil or leaf
The other two hooks located on the left and right
springs.
sides of the crane are called tag lines. These lines attach
HOISTING SYSTEM
to the load and prevent it from spinning freely when
lifting and moving. The tag lines are powered by a 5-hp
The crane is equipped with a non-rotating rigid
ac electric motor. When the tag lines are not used, the
steel boom that pivots on foot pins attached to the main
hooks are stowed on handles attached to the front of the
frame. To put it simply, the boom only moves up and
frame, one on each side.
down. The only way to move the boom left or right is by
using the steering controls to reposition the crane. The
MAINTENANCE OF CRASH CRANES
main hoist is moved by a single dc motor dedicated to
The scheduled maintenance intervals for the crash
that purpose.
crane are critical and must be followed to the letter. The
A single dc electric drive motor provides power to
appropriate maintenance requirements cards dictate the
raise and lower the boom through the luff/main hoist
time schedules and the proper lubricants and fluids for
control. This 60 hp motor receives its power from the ac
this unit. If scheduled maintenance procedures are not
generator after it is converted to dc via the MDC. The
completed properly, this complex crane could fail and
motor is equipped with a dc electric brake, which is
prevent the ship from launching aircraft or removing a
spring set when power is interrupted. This provides a
crashed or disabled aircraft from the recovery area.
13-5
