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- Mobile lighting equipment - Cleaning agent (TB 11-002) - Waterproof compound (TB 05-027) - Clean lintfree cloths B. Visual examination NOTE 1 : The examination must be performed once the wing upper and lower surface skins have been thoroughly cleaned. NOTE 2 : This examination may be replaced by an eddy current test, for users having such equipment at their disposal. The experience tends to demonstrate that, with eddy current testing, the value read is doubled with respect to a visual inspection - see Figure 602. NOTE 3 : This procedure is applicable to the wing upper and lower surface skins. Information specific to the lower surface is given in square brackets. 1) Position ruler (15) at wing root on the upper surface skin [lower surface skin] in the spar area and lengthways - see Figure 607. 2) With horizontal lighting, slide the ruler over the entire width of the spar, and scan the area in this way up to N4 rib. 3) Visually check the evenness of the distance between the ruler and the skin. 4) If a defect (blister) is detected, move ruler (15) sideways and lengthways to determine the surface of the defect and mark its outline on the skin. 5) Using a feeler gage set, measure the height of the defect. 6) Depending on the height of the defect, determine the required solution : - for a defect < 0.0078 in (< 0.2 mm), no corrective action, the defect is certainly due to padding, - for a defect < 0.0118 in and a 0.0078 in (< 0.3 mm and a 0.2 mm), record the readings for annual follow-up, to check for possible evolution. If acessible, perform a preventive treatment with waterproof compound (TB 05-027), - for a defect a 0.0118 in (a 0.3 mm), perform a thorough examination - refer to Paragraph C. C. Thorough examination 1) Depending on the extent of the suspected corrosion, partially open (core sampling, window...) or completely open the skin concerned. NOTE : Core sampling consists in cutting out the skin over a diameter of 0.78 in (20 mm), taking as an axis the tip of the distortion. 2) Measure the depth of the defect : - For a defect s 0.0118 in (s 0.3 mm) contained within a maximum diameter of 2.36 in (60 mm), perform the repair - refer to Page 801. NOTE : If the defect is contained within a diameter greater than 2.36 in (60 mm), contact the manufacturer or a station approved for this type of repair. - For a defect > 0.0118 in (> 0.3 mm), record the defects (position and dimensions) and contact the manufacturer or a station approved for this type of repair. NOTE : If no evidence of corrosion is detected, apply the required blanking solution - refer to Page 801. VISUAL EXAMININATION OF NON-HIDDEN SPAR SURFACES (WEB AND FLANGES) NO CAUTION |
