PS Magazine - TB 43-PS-693
PS, The Preventative Maintenance Monthly
ISSUE 693
AUGUST 2010
36
AUG 10
NSN
5325-00-
Sheet
Thickness
(Ref)
+ . 015
- . 005
+ . 015
- . 005
+ . 015
- . 005
+ . 020
- . 005
A
B
C
D
Dash
No.
(-1)
(-2)
(-3)
(-4)
(-5)
(-6)
(-7)
(-8)
960-2410
074-3301
926-1394
923-9512
783-4754
783-4753
238-6037
946-4275
.015-.052
.052-.085
.085-.128
.128-.192
.192-.255
.255-.318
.318-.380
.380-.510
.150
.175
.220
.325
.385
.445
.515
.640
.056
.090
.131
.195
.260
.320
.390
.515
.055
.055
.055
.070
.070
.075
.075
.075
.100
.100
.100
.160
.170
.180
.180
.180
Length
of Grommet
(In)
Structural
Hole Dia
(In)
1.000
1.125
1.250
1.375
1.500
1.625
1.750
1.875
2.000
3.141
3.534
3.927
4.319
4.712
5.105
5.497
5.890
6.283
When applying grommets, make sure there are no sharp edges and burrs. Use edging
grommets for odd shaped holes in addition to the circular hole sizes shown in the table
below. Keep in mind that the maximum allowable end gap after edging is installed flush
against the hole periphery is .025 inches. When positioning grommets in odd shaped holes,
apply Armstrong-type A-12 adhesive cement, NSN 8040-00-068-8668, or equivalent to the
cleaned edges of the material and the grommet.
Wiring and wire bundles are found passing
through bulkheads, against kick plates and
wrapped against metal lips, ledges and
framing. One way to protect wires is to use
non-metallic nylon edging grommets.
AH-64/UH-60/CH-47 Series…
Protecting Aircraft
Wire Bundles
mechanics,
wire chafing
in the
chinook,
black hawk
and ah-64
aircraft
is not
unusual.
order the
right size
grommet
to fit your
aircraft
using this
table…
here’s a guide to how
long a grommet you’ll
need for different
size holes.
all details
can be found
in specification
mil-dtl-22529.
a lot of
chafing is
caused by
aircraft
vibration.
the
question
for
mechanics
is how
can you
reduce wire
chafing?
Use grommets to protect wiring
have no fear! all of
your wire bundles
will be under these
grommets’ protection!
.067
+.005
-.010
.067
+.005
-.010
B
A
D
C
12.750
12.620
Top view
Side view
End view
693.36-37.indd
1-2
7/2/10
5:29:50 PM
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