P-W-2891A
4.5.5 Cleaning efficiency.
4.5.5.1 Test panel preparation. Prepare nine test panels, constructed from clad aluminum alloy 2024 (T3 temper) conforming to SAE-AMS-QQ-A-250/5, with dimensions of 6 by 3 by
0.025 inch (150 by 76 by 0.6 mm). Deoxidize the test panels by immersion for two minutes in corrosion removing compound conforming to SAE-AMS1640, type I, class 1. Upon removal, rinse the test panels with deionized water to obtain a water-break free surface. Allow test panels to air dry.
4.5.5.2 Test panel soiling. Each of three sets of three test panels shall be soiled with a different contaminant:
a. Turbine engine lubricating oil conforming to MIL-PRF-23699 b. Hydraulic fluid conforming to MIL-PRF-83282
c. JP-5 jet fuel conforming to MIL-DTL-5624.
Soil the test panels by evenly spreading 5 milliliters (mL) of each contaminant onto the surface of the test panel to be cleaned and coated with primer coating. Store the lubricating oil and
hydraulic fluid contaminated test panels for 24 hours at 120 ±2 °F (49 ±1 °C). Air dry the jet fuel contaminated test panels 24 hours at room temperature.
4.5.5.3 Procedure. Clean the nine test panels as follows:
a. Fold a wipe cloth, conforming to CCC-C-46, type I, class 7, or SAE-AMS3819, grade A, and initial dimensions of 9 by 9 in (228 by 228 mm), into a square of 4.5 by 4.5 in (114 mm by 114 mm).
b. Soak the folded cloth with no more than 10 mL of test solvent.
c. Wipe each test panel with one stroke in one direction, applying moderate manual pressure. Ensure that the contact area between the cloth and the test panel is saturated with the test solvent. This procedure (a through c) shall not be repeated more than three times.
d. Allow to air dry for no more than one hour at ambient conditions (see 4.5).
e. Examine each test panel in accordance with ASTM-F22 for conformance to table I.
4.5.6 Adhesion.
4.5.6.1 Wet tape.
4.5.6.1.1 Test panel preparation. Prepare eighteen test panels, constructed from clad aluminum alloy 2024 (T3 temper) conforming to SAE-AMS-QQ-A-250/5, with dimensions of
6 by 3 by 0.025 in (150 by 76 by 0.6 mm). Deoxidize the test panels by immersion for two minutes in corrosion removing compound conforming to SAE-AMS1640, type I, class 1. Upon removal, rinse with deionized water to obtain a water-break free surface. Allow test panels to air dry.
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