MIL-DTL-22706G
b. Conformance inspection (see 4.3).
4.2 Qualification inspection. Qualification inspection shall be as specified in table I.
4.2.1 Qualification test samples. The supplier shall furnish two Type III, Class I ducts or
one Type III, Class II duct for testing to determine conformance with the requirements of this
specification. Class II ducts furnished as test samples shall be cut in half by the testing activity
and tested as two 30-foot ducts.
4.2.2 Test sequence. The test samples specified in 4.2.1 for qualification tests shall be
conducted in the order listed in table I.
4.2.3 Qualification test report. The contractor shall prepare a report of the qualification
test in accordance with MIL-STD-831 showing that the samples tested conform to this
specification. Two copies shall be furnished to the contracting activity. Two additional copies
shall be furnished to the qualifying activity with the verification test sample.
4.2.4 Test methods. The qualification tests shall follow the inspection methods specified
in 4.4. When the scuff cover is used, it shall be considered as an integral part of the duct and
unless otherwise specified in the contract, all tests shall be conducted on the entire duct
assembly.
4.3 Conformance inspection. Conformance inspection shall consist of:
a. Individual inspection (see 4.3.1).
b. Sampling tests (see 4.3.2).
4.3.1 Individual inspection. Each duct shall be subjected to examination of product in
accordance with 4.4.1. Failure to pass the examination shall be cause for rejection of the duct.
4.3.2 Sampling tests. One duct from each lot of 100 or fraction thereof shall be
randomly selected and subjected to a 150 cycle-endurance test in accordance with 4.4.9, followed
by a static proof pressure test performed in accordance with 4.4.2. Immediately upon completion
of the static proof pressure test, conduct the adhesion test in accordance with 4.4.8.
4.3.3 Production lot. A production lot shall consist of ducts fabricated from a single
batch of raw material and produced as one continuous run.
4.4 Inspection methods.
4.4.1 Examination of product. Each duct and scuff cover shall be examined to determine
conformance to the requirements specified herein with respect to materials, workmanship,
marking, weight, and dimensions.
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