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MIL-DTL-83420 Wire Rope, Flexible, For Aircraft Control, General Specification ForThis specification covers the requirements for carbon steel and corrosion resistant steel aircraft control flexible wire rope. Type I wire rope will be capable of operation within a -65 degrees F to +250 degrees F \(-54 degrees C to +121 degrees C\) temperature range in wind, dust, fuel, and oil spills, in wash-down and other environmental stresses and aircraft experiences. Type II wire rope will be capable of operation within a -65 degrees F to +200 degrees F \(-54 degrees C to +94 degrees C\) temperature range in wind, dust, fuel, and oil spills, in wash-down and other environmental stresses and aircraft experiences.

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MIL-DTL-83420M
TABLE III. Breaking strength of type I after endurance testing.
COMPOSITION
A
B
Construction
Tension
MBS 4/
Number
MBS 5/
Number
Nominal
Tension load
load
of
of
diameter of
(-0%,+10%)
(-0,+10%)
reversals 3/
reversals 3/
bare wire rope
1/ 2/
1/ 2/
in.
lbs.
lbs.
lbs.
lbs.
66
70,000
1.0
55
70,000
1.0
3x7
1/32
162
70,000
3.0
135
70,000
3.0
7x7
3/64
288
70,000
5.0
240
70,000
5.0
7x7
1/16
288
70,000
5.0
240
70,000
5.0
7 x 19
1/16
552
70,000
9.0
460
70,000
9.0
7x7
3/32
552
70,000
9.0
500
70,000
9.0
7 x 19
3/32
1,056
70,000
18.0
1,000
70,000
18.0
7 x 19
1/8
1,440
130,000
24.0
1,400
130,000
24.0
7 x 19
5/32
2,220
130,000
37.0
2,100
130,000
37.0
7 x 19
3/16
3,000
130,000
50.0
2,800
130,000
50.0
7 x 19
7/32
3,840
130,000
64.0
3,500
130,000
64.0
7 x 19
1/4
4,680
130,000
78.0
4,000
130,000
78.0
7 x 19
9/32
5,400
130,000
90.0
4,900
130,000
90.0
7 x 19
5/16
7,200
130,000
120.0
7,200
130,000
120.0
7 x 19
3/8
1/
Tension is equal to one half the weight (w) which includes idler sheave and hanger.
2/
The magnitude of the tension loads are test parameters only and are by no means intended as design criteria.
3/
1 cycle = 2 reversals
4/
Equal to 50 percent of the original MBS.
5/
Equal to 60 percent of the original MBS.
TABLE IV. Breaking strength of type II after endurance testing.
COMPOSITION
A
B
Construction
Tension
MBS 4/
Number
MBS 4/
Number
Nominal
Tension load
load
of
of
diameter of
(-0%,+10%))
(-0,+10%)
reversals 3/
reversals 3/
bare wire rope
1/ 2/
1/ 2/
in.
lbs.
lbs.
lbs.
lbs.
66
200,000
1.0
66
200,000
1.0
3x7
1/32
162
200,000
3.0
162
200,000
3.0
7x7
3/64
288
200,000
5.0
288
200,000
5.0
7x7
1/16
288
200,000
5.0
288
200,000
5.0
7 x 19
1/16
552
200,000
9.0
552
200,000
9.0
7x7
3/32
552
200,000
9.0
600
200,000
9.0
7 x 19
3/32
1,056
200,000
18.0
1,200
200,000
18.0
7 x 19
1/8
1,440
500,000
24.0
1,680
500,000
24.0
7 x 19
5/32
2,220
500,000
37.0
2,520
500,000
37.0
7 x 19
3/16
3,000
500,000
50.0
3,360
500,000
50.0
7 x 19
7/32
3,840
500,000
64.0
4,200
500,000
64.0
7 x 19
1/4
4,680
500,000
78.0
4,800
500,000
78.0
7 x 19
9/32
5,400
500,000
90.0
5,880
500,000
90.0
7 x 19
5/16
7,200
500,000
120.0
8,640
500,000
120.0
7 x 19
3/8
1/
Tension is equal to one half the weight (w) which includes idler sheave and hanger.
2/
The magnitude of the tension loads are test parameters only and are by no means intended as design criteria.
3/
1 cycle = 2 reversals
4/
Equal to 60 percent of the original MBS.
20



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