MIL-DTL-28693A
4.3.1 Pressures. Pressures and pressure differentials shall be measured by means of Bourdon-
type gages or other pressure sensing device. The pressure gage shall have an accuracy of one percent
of scale reading.
4.3.2 Temperatures. Temperatures shall be measured by appropriately located thermometers or
thermocouples used with calibrated potentiometers. The thermometers or thermocouples shall have
accuracy within ±2°F (1.11°C).
4.4 Responsibility for compliance. All items shall meet all requirements of sections 3, 4, and 5. The
inspection set forth in this specification shall become a part of the contractor's overall inspection system
or quality program. The absence of any inspection requirements in the specification shall not relieve the
contractor of the responsibility of ensuring that all products or supplies submitted to the Government for
acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing
operations, is an acceptable practice to ascertain conformance to requirements, however, this does not
authorize submission of known defective material, either indicated or actual, nor does it commit the
Government to accept defective material.
4.4.1 Lot records. Manufacturers shall keep lot records for 3 years minimum. Manufacturers shall
monitor for compliance to the prescribed procedures, and observe that satisfactory manufacturing
conditions and records on lots are maintained for these hose assemblies. The records, including as a
minimum, an attributes summary of all quality conformance inspections conducted on each lot, shall be
available to review by customers at all times.
4.5 First article inspection. First article inspection shall be performed at a laboratory acceptable to
the procuring activity on sample units produced with equipment and procedures used in production.
4.5.1 Samples for first article. Samples for first article shall be representative of the products
proposed to be furnished to this specification. Sampling for hose assemblies shall be in accordance with
4.5.2.
4.5.2 First article inspection. The first article inspection shall be performed on a complete hose
assembly. The first article may be either a first production unit or a standard production item from the
supplier's current inventory provided the item meets the requirements of this specification and is
representative of the design, construction, and manufacturing technique applicable to the remaining
items to be furnished under the contract.
4.5.3 Sampling for test. Tests that require only a sample for test shall be from units of product that
have been subjected to and have passed, the examination cited in 4.5, excluding length (100 feet).
4.5.3.1 Sample for flexibility test. A 12-inch (30.5) length of hose identical to the hose submitted for
the lot shall be submitted for the flexibility test cited in 4.7.8.
4.5.3.2 Sampling for burst pressure, tube and cover thickness, and rubber components tests. A 36-
inch (91.44 cm) length of hose identical to the hose submitted for the lot shall be submitted for t burst
test specified in 4.7.6. At the completion of the burst test, additional tests shall be conducted as
specified in tube and cover thickness (see 4.7.1.3) and properties of rubber components (see 4.7.9) on
an undamaged section of the 36-inch (91.44 cm) sample of the hose submitted for the burst test.
4.5.3.3 Sample for tensile pull and elongation test. A section of hose not less than 12-inches (30.5
cm) in length identical to the hose submitted for the lot shall be submitted for the tensile pull and
elongation test specified in 4.7.7.
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