MIL-DTL-6070C
3.17 Workmanship. All details of workmanship shall be in accordance with high grade aircraft
plywood manufacturing practice for flatness, smoothness, uniformity of thickness, and tightness of cut
prevailing among manufacturers normally producing aircraft flat panel plywood and veneer specified
herein.
4. VERIFICATION
4.1 Quality conformance inspection. Quality conformance inspection shall be applied as specified to
plywood and veneer prior to being offered for acceptance under the contract. Failure of the plywood and
veneer to pass the examination or one or more tests shall be cause for rejection. Unless otherwise
specified (see 6.2), quality conformance inspection shall consist of the following:
a. Examination (4.4)
b. Tests (4.5)
c. Inspection of preparation for delivery (4.6)
4.2 Inspection lot. A lot shall consist of all aircraft flat panel plywood of the same material size,
thickness, and number of plies offered for delivery to the Government at one time.
4.3 Sampling.
4.3.1 Sampling for examination . All veneer and finished aircraft plywood in any lot or shipment shall
be examined.
4.3.2 Sampling for straightness of grain . Each sheet of veneer shall be inspected visually. If mandrel
bending tests are made (see 3.5), the number of sheets to be tested shall be not less than one sheet from
each flitch or five sheets from each crate or stack of veneer shall be selected. From each sheet of veneer
selected for tests, bending specimens shall be cut from the entire width within 24 inches of each end, and
at intervals not to exceed 6 feet along the length of the sheet in such a way that the specimens shall
include representative proportions of any areas in which slope of grain is greater than 1 in 10. When both
spiral and diagonal grain are present, the slop of the grain shall be determined in accordance with 3.5.
4.3.2.2 Sampling for specific gravity tests. Samples shall be selected from each crate, stack, bolt, or
flitch from which veneer is used. If taken after the veneer is cut, each crate or stack shall be represented
by not less than 20 specimens. The samples shall be taken from at least 4 sheets, and the specimens shall
be from areas uniformly distributed over selected sheet of veneer. If samples are taken before the veneer is
cut, each bolt or flitch shall be represented by not less than 10 specimens. The samples shall be taken
from each end of each bolt or flitch.
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4.3.2.3 Sampling for shear tests on glue joint . A random sample shall be selected in accordance with
ANSI/ASQC Z1.4 at inspection level S-1.
*
4.3.2.4 Sampling for determining moisture content . A random sample shall be selected from each
inspection lot in accordance with ANSI/ASQC Z1.4 at inspection level S-1.
4.3.3 Sampling for inspection of preparation for delivery. Packaging, packing marking for shipment
and storage shall be inspected to determine conformance with the requirements of Section 5. The sample
unit shall be one shipping container and the lot size shall be the number of containers offered for delivery
at one time. The inspection level shall be S-2 in accordance with ANSI/ASQC Z1.4
4.4 Examination of product. All veneer and finished aircraft plywood shall be examined to determine
conformance with the requirements of this specification for workmanship, construction, thickness,
straightness of grain, defects, joints, size and finish. Any deviation from these requirements shall be
cause for rejection.
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