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|  MIL-B-53090(ME)
4.7.10 Fording test. To determine conformance to 3.12 the M1 MCBS shall be forded in water up to
48 in. (121 cm) deep. After fording the M1 MCBS shall be inspected for damage and operated several
times to ensure the blades work after going thru water.
4.7.11 Rain test. These tests shall be conducted in accordance with MIL-STD-810, method 506.2,
procedure III.
4.7.12 Lubricant inspection. To determine conformance to 3.14 the electromechanical motors shall be
inspected for oil leakage and proper lubrication.
4.7.13 Surface finish inspection. To determine conformance to 3.15 the contractor shall, after the
complete paint finish has been applied and cured, inspect, for workmanship, total paint film thickness
(4.7.13.1) and paint adhesion. The use of test panels in lieu of actual production is prohibited. The paint
adhesion test will be conducted by means of the scribe tape test (see 4.7.13.2). Two locations on each
sample unit shall be selected to conduct the test. The test locations shall be routinely varied among the
following:
a.
Directly adjacent to a weld.
b.
On or directly adjacent to a machine cut or sheared edge.
c.
Any mechanically formed surface where lubricants were used.
d.
Paint touch-up areas.
The precise location for the scribe test shall be in an obscure location and be acceptable to the cognizant
Government quality assurance representative. Upon completion of the scribe test, the scribe marks shall be
feathered into the adjacent area and touched up with the required tap coat. Painting procedures shall be
verified to ensure the requirements of MIL-STD-193 are adhered to. The contractor shall have at least a
quart sample of each production lot of MIL-C-46168 or MIL-C-53039 paint validated for spectral
reflectance characteristics in accordance with 4.2.4 of MIL-C-46168 or MIL-C-53039.
4.7.13.1 Film thickness test. Film thickness shall be verified with a non-destructive film gauge. The
gauge shall be suitable for measurements over the applicable substrate material and shall have sufficient
accuracy to assure compliance to the thickness limitations specified. The gauge shall be capable of being
calibrated to known standards. Wet film shall be checked with a wet film gauge. Five locations on each
sample shall be tested. Four of the applicable surface points tested on each unit shall meet the stated
requirements. Failure of test shall result in rejection of the M1 MCBS.
4.7.13.2 Scribe test. The following test procedure shall be followed:
a. Scribe four (4) one-inch lines completely through the paint finish, one eighth inch apart.
b. Scribe another four (4) one-inch, one-eighth inch apart, ninety (90) degrees to the first set of
lines. The resulting pattern shall be nine, one-eighth inch squares.
c. Press a length of A-A-1830, A-A-884 or any commercially available tape with a minimum
adhesion rating of 45 oz. per inch of width firmly over the scribed pattern, rubbing out all air
pockets.
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