Regulations of Aircraft Registration Article 29
The height of each letter and numeral should be equal, the width of each letter (except the the number 1) and the length of horizontal stroke should be two-third the height of letter. Space between letters should be one-fourth the width of letter, the dash is counted as a letter, the width of a stroke should be one-sixth the height of letter.
中文原文 航空器登記規則第29條
字母及號碼，字之高度應相等，字之寬度及橫劃之長度應為字高之三分之二，字間間隔應為字寬之四分之一，橫劃作為一字計算，筆劃之寬度應為每字高度之六分之一。
但阿拉伯數字「1」之字寬，不在此限。
但阿拉伯數字「1」之字寬，不在此限。