113. Part I of the Act and so much of Part VI of the Act as relates to contributions and the regulations made under those provisions, so far as they are not inconsistent with this Case, apply to an airman with the modification that, where an airman is, on account of his being outside the United Kingdom by reason of his employment as an airman, unable to perform an act required to be done either immediately or upon the happening of a certain event or within a specified time, he shall be deemed to have complied with such requirement if he performs the act as soon as is reasonably practicable, although after the happening of the event or the expiration of the specified time.