Self-contained jack, 10-ton. The 10-
ton self-contained jack, shown in figure 9-11, will lift
20,000 pounds vertically. The rams provide 13 inches
of lift, with another 4 inches available from the extension
screw lift. The overall height ranges from 8 inches
collapsed to 25 inches fully extended.
Safety practices and procedures. The
following special precautions should be observed when
using aircraft jacks:
· Do not try to adjust or defeat the safety valve.
· If the jack will not raise the aircraft high enough,
get a jack that will. Do not use a block of wood
or similar object to get more lift.
· Use the safety locks, if equipped. Lower the
ram locknut as the ram is extended.
· Keep fingers from between the ram locknut and
the cylinder assembly.
· Clean the area under the aircraft before
lowering and then lower slowly.
Operating procedures. Detailed operating
procedures are found in the applicable maintenance
manual. The following general procedures pertain to the
operation of the aircraft jack:
Close the release valve and partially
open the vent assembly vent screw.
Be sure the jack is seated or resting on
a level foundation.
Partially raise the ram with the jack
Position the jack.
If necessary, partially screw out the
extension screw to contact the load.
After jack is firmly positioned, operate
the jack handle with long, smooth strokes until the load
To lower the jack, slowly open the
release valve and slowly lower the load.
Lower the extension screw.
Close and tighten the release valve.
operator inspections should be made on aircraft jacks.
Detailed inspection requirements can be found in the
applicable maintenance manual.
Visual inspection. Look over the
entire jack for obvious discrepancies such as leaks,
loose or missing hardware, and loose hose connections,
Oil level. Check reservoir and refill
Leaks. Check the pump assembly,
ram and cylinder assembly, and hose connections, if
applicable, for signs of leaks.
Check the casters for free movement, rotation, and
condition of the tread.
Maintenance. Consult the applicable
maintenance manual for preventive and scheduled
Engine Trailer. The engine trailer, shown in
figure 9-12, is a 4-wheeled, towable trailer with two rails
mounted on it. Various engines can be loaded on and
transported by using different adapters.
Purpose. The engine trailer transports
engine for and during engine maintenance. It can be
loaded and unloaded by sliding the load to or from
another trailer, can also be towed together with other
Rail trailer airmobile. The tiedown rings
transportation with an engine loaded on it. The 2,500
pound load capacity allows the majority of Army aircraft
engines to be transported .