Electrically-operated. This type of
hoist is similar to the manually-operated hoist in lifting
capacity and lifting distance. However, it requires an
outside source of power, typically 28 vdc to run the
Principles of operation. The topmost
pulley is positioned over the object to be lifted. The
block which contains a pulley and hook is lowered to the
object and connected by means of a lifting adapter,
sling, or chain. The cable is wound up on the winch,
which in turn raises the block through a system of
pulleys. As the lifted object clears the aircraft, the hoist
must be moved away from the aircraft before the object
can be lowered.
Safety practices and procedures. The
following special precautions should be observed when
· Do not exceed the lifting capacity of the
structure, the cable, or the winch.
· Never stand under a loaded hoist.
· Do not leave a loaded hoist unattached.
· Always use enough people to safely move and
control a loaded hoist.
· If using hand signals, be sure each person
knows and understands the signals.
applicable equipment maintenance manual, aircraft
maintenance manual, and local operating instructions or
procedures for detailed guidance. The following general
procedures pertain to the operation of hoists.
Move the hoist into position.
Stabilize the unit by setting the
caster brakes, lowering the leveling pads.
Lower the block to the object to be
Connect the hook to the object and
Release the brakes or raise the
leveling pads, carefully move the hoist away from the
aircraft, and lower the object.
Reinstallation of the object using a
hoist requires completion of steps (a)
and (f), except move the hoist toward the aircraft.
On job completion, release the
caster brakes or raise the leveling pads and move the
hoist away from the aircraft.
operator inspections apply to hoist. Detailed inspection
Cable. Look at exposed cable for
knots, kinks, corrosion, and broken wires.
Casters. Check for flat spots and
Hook. Check safety latch for
Pulleys. Check that the cable is in
Pre-Oiler and Pickler. The pre-oiler and pickler,
shown in figure 9-19, is capable of delivering a constant
supply of corrosion preventive compound (pickling) at 3
gpm and a temperature between 150 and 230 °F (66 and
110°C) with a pressure that should not exceed 250 psi.
It is also capable of delivering pre-oiling fluid at 3 gpm
and a temperature between 150 and 175 °F (66 and
79C) with a pressure of 175 psi. The servicing hose is
25 feet long.
Lubricating Equipment. Lubricating equipment,
shown in figure 9-20, is commonly called grease guns.
Grease guns are used to lubricate various moving parts
on an aircraft. This paragraph will cover hand operated
Purpose. Grease guns are designed to
inject a lubricating substance between two metal
surfaces that move against each other. The lubricant is
injected through a fitting, designed with a check ball to
prevent the lubricant from coming back through the
Type. The most common type of grease
gun is the lever operated. This type of grease gun is
cylindrical, holds 14 ounces of lubricant, and requires
two hands to operate. The lubricant is spring-primed