MIL-S-6451E
3.5.2.2 Installation and removal. Provisions shall be made for installation
and removal of the shield from the required orifice. The provisions shall be
formed as an integral part of the shield and not assembled to the shield.
3.5.3 Heater ducts. When specified (see 6.2), heater ducts shall be provided
on class 1 shields only to serve as a media for attaching ground heater ducts
for preheating aircraft or missile engines, et cetera.
3.5.3.1 Heater duct sleeve. When specified (see 6.2), a heater duct sleeve
shall be provided as follows.
3. 5.3.1.1 Openings. The preheat access opening in the shield for most radial
engines shall consist of two apertures. The openings shall be in the lower
half of the shield, and shall be of the largest cross-sectional area obtain-
able within the limits of the shield. When the combined area of the two
openings does not equal the area of a 12-inch diameter circle, an additional
opening shall be made in the upper half of the shield. This opening shall
be the largest cross- sectional area obtainable within the limits of the
clamps. The heater duct sleeve shall vent into the shield so that all aper-
tures will receive a heater duct. The opening for jet aircraft shall be
12 inches in diameter, centrally located in the shield. If the configuration
of the shield kill not permit a 12-inch diameter opening, the largest cross-
sectional area obtainable within the limits of the shield shall be provided.
3.5.3. 1.2 Sleeve construction. The sleeve shall be fabricated of type 11,
class 5 cloth conforming to MIL-C-10799. The opening in the free end of
the sleeve shall accept a 12-inch diameter heater duct or a 6-inch diameter
heater duct by utilizing a drawstring. If the configuration of the shield
will not permit the 12-inch diameter opening, the fabric sleeve shall taper
out to accommodate the heater ducts.
5.5.3.2 Preheat openings. A preheat access opening for other than engine
inlet shields shall be designed with the best engineering Practice for the
required operation. The design shall be approved by the procuring activity.
3.5.4 Warning streamer. Unless otherwise directed by the contracting officer
(see 6.2), all shields shall have warning streamers attached. Warning streamers
shall be in accordance with NAS 1756.
3,6 Performance
3.6.1 Environmental conditions. The shield shall be capable of withstanding
or operating under the following conditions:
Temperatures - Operation at -54° to
storage at -54° to
a.
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