MIL-DTL-18240F
X MAXT = Individual on prevailing torque values on the 1st cycle for combined samples
X MAXT = Average of X MAXT values
X MINT = Individual off prevailing torque values on the 5th cycle for combined samples
x
= Average of X MINT values
MINT
N1
= Number of parts in first sample
= Number of parts in combined sample
NT
∑
- (∑ X
)2
2
N
X
=
1
M AX1
M AX1
S
- 1)
M AX1
N 1(N
1
∑
- (∑ X
2
)2
N
X
=
T
M AXT
M AXT
S
- 1)
M AXT
N
(N
T
T
∑
- (∑ X
)2
2
N
X
=
1
M IN 1
M IN 1
S
N 1(N 1 - 1)
M IN 1
∑
- (∑ X
2
)2
N
X
=
T
M IN T
M IN T
S
- 1)
M IN T
N
(N
T
T
TABLE X Attribute plan for quality conformance torque tests.
Lot size
Sample Size
Acceptance number of failed parts
Under 10,000
10
0
10,000 through 50,000
15
0
50,001 through 100,000
20
0
Over 100,000
32
0
22
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