(1) Subject to subregulation (5), the Director General may, on sufficient ground being shown to his satisfaction after due inquiry, vary, suspend or revoke a document.
(2) Save as provided by subregulation (3), the Director General may exercise his or her powers under subregulation (1) only after notifying the holder of a document of the intention to do so and after due consideration of the case.
(3) The holder or any person having the possession or custody of any document, which has been varied, suspended or revoked pursuant to these Regulations shall surrender it to the Director General within the time specified by the Director General.
(4) The breach of any condition subject to which any document was issued, other than a licence issued in respect of an aerodrome, shall, in the absence of provision to the contrary in the document, render the document invalid during the continuance of the breach.
(5) Notwithstanding regulation 89 the Director General may vary a document if he is satisfied that it is in the interests of aviation safety to do so, whether or not there has been a contravention of these Regulations.
(6) In particular, and without prejudice to the generality of the foregoing, the Authority may exercise its powers pursuant to subregulation (1) if it appears to the Authority that the person to whom the document was granted has committed a breach of any condition to which it is subject.