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Variation of basic construction |
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|  MIL-T-6396E
4.3.3.1 Variation of basic construction. Variation of a basic construction
which has been granted preproduction approval shall be indicated by a suitable
dash number or lettering system. Details of each variation shall be submitted
to the acquisition activity which, at its discretion, may extend preproduction
approval to the variation.
4.4 Quality conformance inspections. The quality conformance inspections
shall consist of individual tests and sampling tests.
4.4.1 Individual tests.
Each fuel tank shall be subjected to:
Examination of product
a.
4.6.1.1
b.
Workmansnip
4.6.1.2
c.
Dimensional
4.6.l.3
d.
Weight
4.6.1.4
e. Leakage
4.6.1.5
4.4.2 Sampling tests
4.4.2.1 Types I and III tank construction. Unless otherwise specified, one
tank shall be selected from the first 100 tanks or less, plus one tank from
each 1,000 tanks thereafter or fraction thereof, on the contract or purchase
order, and shall be subjected to:
a.
Capacity
4.6.4
b.
Proof pressure
(types I and III tanks)
4.6.26
Burst pressure
c.
(types I and III tanks)
4.6.27
Simultaneous slosh
d.
and vibration
4.6.6
e.
Low temperature
leakage
4.6.22
4.4.2.2 Type II tank construction. Production fuel tanks shall be subjected
to the stand test in accordance with 4.6.2 and the following schedule. For the
purpose of this sampling plan, each part number shall be treated as a separate
order in determining the applicable sampling requirement. If failures occur,
corrective action shall be taken to correct the discrepancy (see 4.4.2.4):
a.
For orders over 100
(1) sample 10 tanks completely at random out of the first lot of 25
(2) sample 10 tanks completely at random out of the next lot of 50
(3) one at random out of each additional lot of 15
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