Regulations of Aircraft Registration Article 26
The markings of aeroplane and helicopter shall be placed as the following:1) For aeroplane:(1) Wings. The markings shall be painted on the left half or extend to the right half of the lower surface of the wing structure, and equidistant to the front end and rear end of the wing, with top of the words uniformly facing the front end of the wing.(2) Fuselage or tail surfaces. Markings on the fuselage shall be painted on the prominent position of each side of the fuselage between the wings and the tail surface. When located on a single vertical tail surface they shall appear on both sides. When located on multi-vertical tail surfaces they shall appear on the outboard sides of the outer surfaces.2) For helicopters markings shall be painted on fuselage, tailboom or both sides of vertical tail surface structure solidly fixed.
中文原文 航空器登記規則第26條
飛機及直昇機之標誌位置如下：
一、飛機：
（一）機翼之標誌：應漆於左翼之下翼面，並得延伸至右翼之下翼面，標誌之位置與機翼前緣及後緣之距離相等，字頂應一律向機翼前緣。
（二）機身或機尾之標誌：機身之標誌應漆於機身之兩側介於機翼與機尾間顯著處。
機尾之標誌，為單垂直尾面者，其左右兩面均應標漆。
機尾有數個垂直尾面者，應漆於外端垂直尾面之外側。
二、直昇機之標誌，應漆於機身、尾桁或垂直尾面兩側固定結構之處。
一、飛機：
（一）機翼之標誌：應漆於左翼之下翼面，並得延伸至右翼之下翼面，標誌之位置與機翼前緣及後緣之距離相等，字頂應一律向機翼前緣。
（二）機身或機尾之標誌：機身之標誌應漆於機身之兩側介於機翼與機尾間顯著處。
機尾之標誌，為單垂直尾面者，其左右兩面均應標漆。
機尾有數個垂直尾面者，應漆於外端垂直尾面之外側。
二、直昇機之標誌，應漆於機身、尾桁或垂直尾面兩側固定結構之處。