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| MIL-S-7886B
cate conformance to all requirements of tests
utilize his own or any other inspection facili-
conducted.
ties and services acceptable to the Govern-
ment. Inspection records of the examination
4.3.1.2 Manufacturer's drawings. T w o
and tests shall be kept complete and avail-
copies of manufacturer's drawings submitted
able to the Government as specified in the
with the qualification test sample shall in-
contract or order. The Government reserves
clude a cutaway section showing all parts
the right to perform any of the inspections
in their normal assembled position and shall
set forth in the specification where such in-
specify part numbers of all parts and subas-
spections are deemed necessary to assure
semblies.
supplies and services conform to prescribed
requirements.
4.3.2 Tests. Qualification tests of spark
plugs shall consist of the following tests:
4.2 Classification of tests. The inspection
(a) Laboratory tests
and testing of spark plugs shall be classified
All items of groups A and B tests
as follows:
(4.4.1 and 4.4.2).
(a) Qualification tests (4.3).
(b) Engine ground tests (4.7.6, 4.7.7,
(b) Acceptance inspection (4.4).
and 4.7.8). In engine for which
plugs are designed.
4.3 Qualification tests.
(c) Engine-airframe flight test
In the flight vehicle of intended
4.3.1 Sampling instructions. Qualification
end use (4.8).
test samples shall consist of a sufficient num-
ber of spark plugs to equip a minimum of 3
4.4 Acceptance inspection. Acceptance in-
engines, plus 10 percent, for which they are
spection shall consist of groups A and B in-
designed and 25 additional plugs for labora-
spection.
tory test purposes. Each spark plug part
number shall be approved separately. Each
4.4.1 Group A inspection. Group A inspec-
sample shall be identified as required and
tion shall consist of the following:
forwarded to the testing location designated
by the procuring activity in the letter of au-
Examination
(4.7.1)
thorization. The samples shall be plainly
Resistor
(4.7.2)
identified by securely attached durable tags
Gas leakage (new spark plugs) (4.7.3)
marked with the following information:
Dielectric strength
(4.7.4)
Sample submitted by (manufacturer's
4.4.2 Group B inspection. Group B in-
name) (date) for qualification tests
spection shall consist of the heat rating test
in accordance with Specification MIL
(4.7.5) .
S-7886B under authorization (refer-
ence letter of authorization).
4.5 Acceptance inspection procedure.
4.3.1.1 The above samples submitted for
4.5.1 Inspection lot. Except as specified
qualification tests shall be accompanied by a
in the procurement document for group B
complete manufacturer's test report showing
inspection, an inspection lot shall consist of
results of the manufacturer's tests on ad-
spark plugs of the same part number pro-
ditional spark plugs of each part number.
duced under essentially the same manufac-
The bench tests conducted by the manufac-
turing conditions and submitted for accept-
turer shall include the tests specified in 4.7.1
ante at the same time.
to 4.7.5, inclusive. The test results shall indi-
5
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