MIL-DTL-1688G
4.4.3 End item length and winding examination. The rope shall be examined for the defects listed below. The lot size
shall be expressed in units of coils of rope. The sample unit shall be one coil of rope. Defects shall be as listed below.
The inspection level shall be S-3, and the AQL, expressed in terms of defects per hundred units, shall be 4.0. the
required length of the coil (see table II) shall be determined using the following formula:
W x L = Length per coil in feet.
When W = the net weight of the coil in 0.1 pound.
L = the lot average of the weight-length relationship (length/pound) as specified in
table I.
Defects
Length of rope is less than specified or more than length specified (see table II).
Length of rope on coil is more than 6 feet less than the length indicated on the ticket.
Improperly or not firmly wound resulting in kinking, knotting, entangling, or slippage during
unwinding, or otherwise affecting free unhampered unwinding of rope.
Any end frayed or not cut off squarely or neatly.
Any end not securely whipped or heat sealed.
4.4.4 End item testing. The end items shall be tested for the characteristics listed in table V. The methods of testing
specified in FED-STD-191, wherever applicable, and as listed in table V shall be followed. When the data in the
"Number of determinations" and "Results reported as" columns are not specified in table V, they shall be as required by
the referenced test method. The physical and chemical values specified in section 3 apply to the average of the
determinations made on a sample unit for test purposes as specified in the applicable test methods. The lot size shall
be expressed in units of coils of rope. The sample unit shall be one coil of rope. The sample size shall be in
accordance with table VI. The lot shall be unacceptable if one or more sample units fail to meet any requirement. All
test reports shall contain the individual values utilized in expressing the final results. Tests to determine compliance
with document requirements may be made under prevailing atmospheric conditions. In case of dispute, tests shall be
made upon material that has reached equilibrium under standard conditions as defined in FED-STD-191.
TABLE V. End item tests
Number of
Requirement
determinations
Results
Characteristic
reference
Test method
per sample unit
reported as
Number of strands
3.5
Visual
1
Pass or fail
Lay of rope
3.5
Visual
1
Pass or fail
Shrinkage
3.5
6010
-
-
Circumference
Table I
6003
-
-
Length per pound
Table I
6004
-
-
Breaking strength:
Initial
Table I
6015 1/
-
-
After heat aging
3.5.1
6015 and
2
Average of 2
(percent strength)
4.5.1
determinations to
nearest 10 lb.
calculated to nearest
0.1 percent
Elongation
Table I
6015
-
-
Length per 10 turns
Table I
6000
-
-
Hardness
3.5.2
6020
-
-
Extractable matter
2.6
2611 2/
2
Average of 2
determinations to
nearest 0.1 percent
Colorfastness to
3.7.1
5671 3/
1
Pass or fail
weathering
pH
3.8
2811
-
-
1/ Failures in tests tend to occur at or near the end of the free length, but may occur in the mid-span between the
splices. Failures occurring within the eye splice shall be disregarded and another specimen shall be tested from the
same sample unit (see figure 1).
2/ Except that a 5-gram specimen shall be used and the extract solvent shall be petroleum ether.
3/ The specimens shall be exposed for 40 standard fading hours.
5
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