trailer, model 3000B. The removal and position-
of the ladder. The stands are lowered by using
ing (or installation/removal) trailer, as the name
the hydraulic release valve on the pump.
shows, is used to remove and install engines and
move them for short distances. The transporta-
The major difference between the B-4A and
tion trailer is used for transporting engines over
the B-5A stands is their size and height range. The
longer distances and to transfer engines from
B-4A extends for a working height of between
other pieces of the matched rail ground-handling
3 and 7 feet. The B-5A extends for a working
height of between 7 and 12 feet. Both stands have
system. Actual work on the engine is normally
performed after it is transferred to the engine
a capacity of 500 pounds. The B-4A is 8 feet long,
workstand. The workstand is usually in a fixed
3 feet wide, and weighs 460 pounds. The B-5A
location in the hangar or shop.
is 8 feet 4 inches long, 8 feet wide at the base, and
weighs 860 pounds.
3000B Trailer
Other Maintenance Platforms
Figure 3-18 shows the 3000B trailer. The unit
There are many more types of workstands
is a four-wheel trailer incorporating a detachable,
available to you from both Navy and commercial
telescopic tow bar at the front and a tow coupling
at the rear. The twin parallel rails are equipped
sources--from foot-high work stools to step
with male and female quick-disconnect couplings
stools, stepladders, and phase platforms. These
and spring-loaded roller adapter stops on both
are generally designed for the specific jobs they
are used for and incorporate the strength, rugged-
ends of each rail. The rails can be mated to the
ness, and features required for safety. If used
model 4000A or B engine removal stand or the
properly and with care they are safe.
model 3110 engine workstand.
What isn't safe is anything that wasn't
The main purpose of the 3000B trailer is to
move or transport engines for short or long
designed as a ladder or workstand; such as folding
steel chairs, swivel or even solid chairs, boxes,
distances, such as hangar to hangar or from
card tables, cans, barrels, drums, tractor hoods,
squadron to the aircraft intermediate maintenance
department (AIMD). The trailer is one part of the
or the top of any other SE. There are a hundred
universal matched rail ground-handling system.
other things that people try to use every day
instead of proper workstands. These substitutes
The trailer weighs 600 pounds and has a load
are usually available and convenient, although
carrying capacity of 8,000 pounds. It is equipped
they are NOT safe. They are dangerous and cause
with pneumatic tires inflated to 30 psi. The rails
a tremendous number of falls and disabling
injuries.
are 12 feet 8 inches long. The overall trailer is 2
feet 10 inches high and 6 feet wide.
ENGINE TRAILERS
AND WORKSTANDS
Since the days of the early axial flow turbojet
engines, the Navy has moved toward universal
engine installation, removal, and transportation
trailers and workstands. These basic trailers and
engine workstands are a matched rail ground-
handling system that can be modified to handle
different types of engines, installations, and air-
craft by the use of various peculiar support equip-
ment (PSE) adapters and, in some cases, hoisting
equipment.
The equipment in common use today are the
engine removal and positioning trailer, models
Figure 3-18.-3000B engine transportation trailer.
4000A and 4000B, and the engine transportation
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