63. Any person subject to this Act who commits any of the following offences, that is to say:-(a) signs any certificate in relation to an aircraft or aircraft material belonging to the Government without ensuring the accuracy thereof; or(b) being the pilot of an aircraft belonging to the Government, flies it at a height less than such height as may be specified by the Chief of Air Staff, except while taking off or landing, or in such other circumstances as may be specified by the Chief of Air Staff; or(c) being the pilot of an aircraft belonging to the Government , flies it so as to cause, or to be likely to cause, unnecessary annoyance to any person;shall, on conviction by court-martial, be liable to suffer short imprisonment.