ckness - Measurement the effective date of this AD, measure flight control surface paint thickness as specified in paragraph (h)(1) of this AD. Ref CB 121. G550 &Ns 5038, 5079, 5223, 5227, 5237, 5240, 5245, 5246, 5252, 5258, 5261, 5265, 5267, 5283, 5290, 5293, 5294, 5302, 5307, 5311, 5318, and 5