MIL-DTL-2845E (SH)
shall be of 10- by 10-inch or 12- by 12-inch timber. The support member shall
be covered to prevent propeller hub damage. Cleats shall be used to align and
fasten the crib members together. Steel rods, threaded at each end, shall be
used to fasten the timbers to the car floor. Steel tie rods, not less than 1-
inch diameter, shall be fastened to the timber shaft and to the car floor to
provide longitudinal bracing. Blocking and bracing shall be applied between
the crib walls to prevent side movement. To prevent propeller rotation, either
blocking between the propeller blades and crib walls or holddown rods shall be
installed. The propeller blades shall not be used to support the propeller
weight or to block, brace or prevent shifting of the propeller and shall not
extend through an orifice or any opening in the car floor. Loading on open
cars shall meet the requirements of the Association of American Railroads
Rules governing car loading.
3.14.6.2 Truck shipments of monobloc propellers. The carrier vehicle
shall transport the propeller, forward face down, in a tilted position either
on a separate shipping frame (see figure 1) or securely mounted on the
carrier. The carrier shall contain a propeller centering and securing system
consisting of, but not limited to:
(a)
A steel, threaded, centering shaft secured to the carrier.
(b)
A wood plug, padded clamps, or braces at the base of the propeller
hub to center the propeller on the centering shaft.
(c)
A metal centering plate of not less than 1/2-inch thickness,
predrilled, to accommodate the propeller centering shaft and
lifting eyebolts (see 3.14.2.2).
Metal plates shall be provided by the activity shipping the propeller. A non-
metallic gasket-type barrier shall be placed between the metal plate and the
propeller hub. Chains or other metallic holddown devices that are added, when
required for shipment and safety purposes, shall be covered with heavy duty
chafing gear such as rubber or fire hose. Hold down devices shall be arranged
and secured to the carrier and propeller in a manner so that no contact with
the propeller blade and blade edges shall ensue during handling and shipment.
3.14.6.3 Shipments of built-up or controllable-pitch propellers. Crated
built-up or controllable-pitch propellers shall be transported in accordance
with federal and state trucking regulations. Crates shall be protected from
exposure to the weather by a tarp or other suitable covering.
3.14.7 Storage of propellers. Each monobloc propeller or controllable
pitch propeller crate shall be placed on wood skids of sufficient size to
support the propeller or crate above the ground level. Alternatively, each
propeller may be supported on a skid-type base. Storage shall be on a
concrete slab with a weight bearing capacity greater than the weight of the
propeller. Propellers shall be stored in an unheated warehouse when possible.
When warehouse space is not available, propellers shall be stored in open
covered storage. Open covered storage is defined as storage inside an open-
type cover consisting of sides, ends, and top. The cover may be of the nailed
or demountable type, and of wood or metal construction. Access areas such as
a door shall be constructed to permit personnel entry into the covered storage
for inspection of the propeller. A clearance of not less than 12 inches shall
be allowed between the propeller and closest member of the container cover.
When in open covered storage, a flexible, waterproof cover shall be placed
over the container. Crated propeller blades shall not be stacked and shall be
covered with a waterproof cover. Propellers shall not be stored where surface
temperatures of the propeller will exceed 150 degrees Fahrenheit (ºF).
Monobloc propellers shall be stored on the forward face. The following
specifications may be used for guidance in material selection, fabrication,
and assembly of the skid-type base and cover:
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