MIL-PRF-55371B(CR)
TABLE V. Group C inspection.
Inspection
Requirement
Test
paragraph
paragraph
Shock; drop
3.6.4.1
4.6.4.1
Bounce
3.6.4.2
4.6.4.2
Temperature
3.6.1/3.6.1/2
4.6.1/4.6.2
Humidity (moisture -resistance)
3.6.3
4.6.3
Error due to change in humidity
3.5.13
4.5.3
Tensile strength of ribbon
3.5.7.1
4.5.4
Abrasion test
3.5.7.2
4.5.5
4.4.3.1 Sampling for Group C inspection. Sampling shall follow the procedures indicated
in 6.2.j.
4.4.3.2 Order of inspection within Group C. Group C inspection shall be performed on
each unit in the order shown in Table V.
4.4.3.3 Group C failures. Group C failures shall be reported and corrective action taken in
accordance with the requirements specified in the contract or purchase order.
4.4.4 Reinspection of conforming Group C sample units. Unless otherwise specified,
sample units which have been subjected to and passed Group C inspection may be accepted on
the contract provided all damage is repaired and the samples units are resubjected to and pass
Group A and B inspections.
4.5 Methods of inspection.
4.5.1 Operation test. The ribbon shall be withdrawn for its entire length and retracted
using the handle. There shall be no evidence of restriction or binding when performing this test.
(See 3.5.14).
4.5.2 Accuracy. The ribbon shall be extended to its full length and tested for accuracy of
graduations and frequency markings in accordance with 3.5.12.
4.5.3 Error due to change in humidity. A specimen 20 inches in length shall be removed
from each sample tape under test and conditioned for 48 hours in circulating air of 30 ± 2 percent
relative humidity at a temperature of 70° to 80°F. The specimen shall be hung in a vertical
position under no other load than its own weight during the conditioning period. At the end of
the 48 hours, a 10 pound load shall be hung on the lower end of each specimen and after a period
of 10 minutes, the distance between the gage marks measured. The load shall then be removed
and the specimen conditioned for 48 hours in circulating air 95 ± 2 percent relative humidity and
at a temperature of 70° to 80°F. At the end of 48 hours of conditioning, the distance between the
measurements taken shall be considered as the change in linear dimensions due to humidity and
all samples shall conform to 3.5.13.
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