P-W-2891A
4.5.6.1.2 Test panel soiling. Each of three sets of six 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 five milliliters (mL) of contaminant onto the test surface of the test panel. 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 for 24 hours at room temperature.
4.5.6.1.3 Test panel cleaning. Lightly dampen a wipe cloth conforming to
SAE-AMS3819, grade A, or CCC-C-46, class 7, with the test solvent and clean the soiled test panels with one stroke in one direction, applying moderate manual pressure. This procedure may be repeated no more than three times, using a clean wipe cloth and changing stroke direction
each time. Allow the test panels to air dry.
4.5.6.1.4 Application of primer coating. Spray primer coating conforming to
MIL-PRF-23377, type I, class C, to test panels for each contaminant within one hour of cleaning with the test solvent. Spray apply primer coating conforming to MIL-PRF-85582,
type I, class C1 or N to the remaining test panels within one hour of cleaning with the test solvent. Store the coated test panels at 72 ±4 °F (22 ±2 °C) for not less than 14 days.
4.5.6.1.5 Procedure. Test the coated test panels in distilled water for 24 hours at room temperature, in accordance with FED-STD-141, method 6301. Examine the primer coatings for conformance to the requirements of table I.
4.5.6.2 T-peel.
4.5.6.2.1 Test panel preparation. Prepare twelve test panels, constructed from clad aluminum alloy 2024 (T3 temper) conforming to SAE-AMS-QQ-A-250/5, with dimensions of 12 by 6 by 0.016 in (304.8 by 152.4 by 0.41 mm). Deoxidize the test panels by immersing each 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.
4.5.6.2.2 Test panel soiling. Soil twelve test panels, four test panels for each contaminant:
a. Hydraulic fluid conforming to MIL-PRF-83282
b. Turbine engine lubricating oil conforming to MIL-PRF-23699 c. JP-5 jet fuel conforming to MIL-DTL-5624.
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