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caps, or protective covers when the related component
19. ENVIRONMENTAL EMI/RFI BACKSHELLS. This
is not in operational use. The dummy receptacle shall
type of backshell is used where moisture and EMI/RFI
be marked and located to permit easy access. See WP
protection is required. Moisture protection is
006 04 for detail information on dummy receptacle
accomplished by the use of 0-rings, grommets, and
M83723/61-1. See WP 008 03 for detailed information
other sealing devices. See Note following paragraph 2
on dummy receptacle MS3115. See Note following
this WP on AS, M and MS prefix. Refer to WP 008 03 for
paragraph 2 this WP on AS, M and MS prefix.
detail information on the following:
22.
DUST CAPS. Protective covers are more
a. 4 5 E n v i r o n m e n t a l E M I / R F I B a c k s h e l l
commonly called dust caps. The purpose of dust caps
M85049/6.
is to prevent dirt, or contaminants from entering
connectors, pins, and sockets and to prevent coupling
b. 9 0 E n v i r o n m e n t a l E M I / R F I B a c k s h e l l
device from damage. See WP 006 04 for detail
M85049/8.
information on dust caps: MS3180, MS3181, M83723/
59, M83723/60-1, M83723/60-2 and MS90376. See Note
c.
Straight Environmental EMI/RFI Backshell
following paragraph 2 this WP on AS, M and MS
M85049/10.
prefix.
20.
CONDUIT FITTINGS. Conduit fittings are used
23.
RUBBER BUSHINGS. The primary use is to
to connect a conduit to a connector and may be either
provide a cushion for wires at connector and to aid
a ferrule, nut, adapter, box fitting, 45 elbow, 90 elbow,
with strain relief. Bushing standard material and color
hex nut, seal assembly, or Y fitting. See WP 007 03 for
is black neoprene. See WP 008 03 for detail information
detail information on conduit fittings: AN3050, AN
on rubber bushing MS3420. See Note following
3051, AN3052, AN3053, AN3054, AN3055, AN3056,
paragraph 2 this WP on AS, M and MS prefix.
AN3058, AN3060, AN3061, AN3062, AN3063, AN3064,
AN3066, AN3068 and AN3067. See WP 007 03 for
24.
SEALING PLUGS. Sealing plugs are inserted to
detailed information on the Y fitting, AN3250. See
fill a cavity in a connector insert. The purpose is to seal
Note following paragraph 2 this WP on AS, M and MS
all unoccupied apertures in the insert, especially in
prefix.
environmental connectors. The plugs are inserted large
end first. See Figure 13 for detail information on the
21.
DUMMY RECEPTACLES. Dummy receptacles
NAS1668 sealing plug.
are provided and shall be used to stow unmated plugs,
Figure 13. NAS1668 Sealing Plug Part Number Breakdown