Any person subject to air-force law who, being the pilot of one of Her Majesty's aircraft, flies it at a height less than such height as may be provided by any regulations issued under the authority of the Air Council, the Admiralty, or the Army Council, except—
(a)while taking off or alighting, or
(b)in such other circumstances as may be so provided,
shall, on conviction by court-martial, be liable to imprisonment for a term not exceeding two years or any less punishment provided by this Act.