MIL-DTL-2845E (SH)
accordance with MIL-B-121, type I, grade A, class 2 shall be placed between the
washers and the blade palm.
3.14.1.3 Preservative application. Screw slots, holes, other machined
attributes, or sharp edges shall be covered with tape in accordance with MIL-T-
22085, type II to prevent the preservative from spanning gaps. Monobloc and CP
propellers shall be coated with a strippable compound which shall be in accordance
with MIL-C-6799, type II, multi-coat system. The coating shall be applied directly,
except as otherwise specified herein, to the propeller. The finished coat system
shall consist of three separately applied coats in the following order: black, gray,
and a white top coat, having a 12- to 15-mil total dry film thickness. The material
can be sprayed, brushed, or rolled in passes to a 4- to 5-mil dry thickness per coat
without sagging. The compound application shall be in accordance with MIL-C-23760.
In no case shall a white coat be applied as the first coat. Unless otherwise
specified (see 6.2), propellers less than 30 inches in diameter shall be preserved
with material in accordance with MIL-PRF-16173, grade 4. NRFI propellers shall be
coated with a single black coat of preservative. An acrylic or transparent
protective coating or covering shall be applied over the stamped propeller
identification markings to maintain these markings in a fully visible and readily
readable condition after further preservation. Edges of the preservative adjacent
to the stamped hub or palm data shall be sealed with an acrylic coating or tape
conforming to MIL-T-22085, type II.
3.14.1.3.1 Alternate procedure - strippable compound. Screw slots, holes,
other machined attributes, or sharp edges shall be covered with tape in accordance
with MIL-T-22085, type II to prevent the preservative from spanning gaps. The
strippable compound shall be in accordance with MIL-C-6799, type II, multi-coat
system. Except as otherwise specified herein, the coating shall be applied directly
to the propeller. The finished coat system shall consist of two separately applied
coats in the following order: type II, class 1 black, and type II, class 5 white top
coat, having a 12- to 25-mil total dry film thickness. The material may be sprayed
or brushed on in passes to a 4- to 5-mil dry thickness per coat without sagging or
runs. The compound application shall be in accordance with MIL-C-23760. In no case
shall a white coat be applied as the first coat. NRFI propellers shall be coated
with a single black coat of preservative. An acrylic or transparent protective
coating or covering shall be applied over the stamped propeller identification
markings to maintain these markings in a fully visible and readily readable
condition after further preservation. Edges of the preservative adjacent to the
stamped hub or palm data shall be sealed with an acrylic coating or tape conforming
to MIL-T-22085, type II.
3.14.1.4 Propeller blade edge guards. Blade edge (including tips) guards shall
be applied over the protective coating and be applicable only to propellers greater
than 60 inches in diameter, and less than 60 inches in diameter when the propellers
are not crated. Prior to edge guard application, the edge of each propeller blade
shall be completely covered with at least two thicknesses of not less than 8-ounce
canvas, or cloth reinforced rubber of 0.187-inch thickness. Blade tips of class 1
propellers identified in accordance with NAVSEA S9245-AR-TSM-010/PROP shall have
cloth reinforced 0.187-inch thick rubber applied over the canvas. Blade edge guards
shall be preformed to conform to the blade shape and shall be placed over the canvas
and rubber covering. The edge guard shall be fabricated of galvanized sheet metal,
18 gauge (0.048-inch), using figure 2 as a guide. Edge guard sections shall be
joined by the use of stainless steel screws and double nuts to permit removal of
damaged sections of edge guards. A minimum of two, but not more than four,
corrosion-resistant steel (stainless steel) straps shall be secured to the metal
edge protector. Attachment hardware for the straps shall be stainless steel.
Strapping shall be applied on both sides of each blade following the blade surface
contour, and positioned to prevent the edge protector from loosening or becoming
dislodged during handling, shipment, and storage. The blade edge guard straps shall
be protected from contacting the preserved propeller surface by covering the strap
with not less than two thicknesses of 8-ounce canvas or cloth reinforced rubber of
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