3.5 Reliability. Concurrent with the start of regular production, a production sample of
four filter units shall be tested in accordance with Task 302 of MIL-STD-781 and test plan
IV-D of MIL-HDBK-781. The lower test mean-time-between-failure (01) shall be 467
hours and the upper test mean-time-between-failure (00) shall be 935 hours. The produc-
tion sample shall be tested continuously in the configuration specified in 184.108.40.206 and 220.127.116.11
without temperature, vibration or input voltage cycling. An accountable failure shall be
defined as any deviation from the requirements specified in 3.3.2.
3.6 Workmanship. The filter units shall be free from cracked, bent or dented metal
sections and foreign matter (dirt, oil or viscous materials).
4.1 Responsibility for inspection. Unless otherwise specified in the contract or pur-
chase order, the contractor is responsible for the performance of all inspection require-
ments (examinations and tests) as specified herein. Except as otherwise specified in the
contract or purchase order, the contractor may use his own or any other facilities suitable
for the performance of the inspection requirements specified herein, unless disapproved by
the Government. The Government reserves the right to perform any of the inspections set
forth in this specification where such inspections are deemed necessary to ensure supplies
and services conform to prescribed requirements.
4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3
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 require-
ments 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.
4.1.2 Contractor assurance of compliance. The contractor's quality program or de-
tailed inspection system shall provide assurance of compliance of all characteristics with the
applicable drawing, special packaging instruction, and specification requirements using, as
a minimum, the conformance criteria specified herein.
4.1.3 Alternative inspection provisions. Alternative inspection procedures, methods,
or equipment, such as statistical process control, tool control, and other types of sampling
procedures may be used by the contractor when they provide, as a minimum, the level of
quality assurance required by the inspection provisions specified herein. Prior to applying
such alternative procedures, methods, or equipment, the contractor shall describe them in a
written proposal submitted to the Government for evaluation and approval. (See 6.5.) When