MIL-S-6451E
3.5.1.2 Channel attachment. The two sections of the shield for radial engines
shall be joined by a channel to form a tongue-and-groove attachment. The bot-
tom horizontal edge of the upper shield shall receive and retain the upper
edge of the lower shield. The connection of the two shall form a dust-tight
seal . The arrangement shall be such that the upper section will be installed
in the cowl after the lower section has been installed.
3.5.1.3 felt seal. The periphery of the shield and the inner periphery that
contact the propeller hub shall be covered with 1.50 by .75-inch felt seal
conforming to C-F-206. The seal shall absorb variations in the cowl and
orifice opening to assure close fit and protect the aircraft skin. The felt
shall compress . 75 inch from the 1.50 inch thickness when installed in the
opening.
3.5. 1.3.1 Felt bonding. The felt shall be bonded into the channel with
cement conforming to MMM-A-1617, type II. The cured adhesive shall be
stronger than the felt. The felt shall be covered and held in place with
waterproofed, type 2, class 5 cloth conforming to MIL-C-10799. The cloth
shall overlap the channel and shall be riveted through two thicknesses of
the fabric.
3.5.1.4 Handles. The shield shall be provided with commercial-type handles
located to facilitate installation and removal. The upper shield for radial
engines shall be equipped with two handles. The lower shield need not be
provided with handles. The shields for jet aircraft shall be equipped with
one or two handles.
3.5.1.5 The shields shall be so constructed that simple handtools, such as
screwdrivers and open end wrenches, may be used for maintenance and servicing.
3.5.2 Class 2 shield. The class 2 shield shall be constructed of material
conforming to the requirements of 3.3.4. Thermal and ultraviolet stabilizers
shall be added to the virgin base resin adequate to prevent fading of color
and deterioration of material due to elevated temperatures and prolonged
exposure to sunshine. Specified color shall be achieved by the addition
of inorganic pigments. The shield shall provide an interference press fit
when placed within the opening or on the flange of the desired orifice. The
structural design of the shield shall be governed by the required size of
the opening and the minimum thickness shall be 0.1 inch. The shield shall
b of one- or two-piece sections as specified in 3.5.1 and 3.5.2.1.
3.5.2.1 Sectionalized class 2 shield. Sectionalized class 2 shields, when
required, shall be joined by an integral preformed channel to form a tongue-
and-groove attachment. The arrangement of each section of the shield shall
conform to the best engineering practice. The assembled shield shall form
a dust-tight seal.
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