49D. Cancellation, suspension or endorsement on Type Certificate- If at any time the Director-General is satisfied that there is a reasonable doubt to indicate that the safety of the aircraft is imperilled because of a defect in the aircraft, aircraft component or item of equipment of that aircraft, he may cancel, suspend or endorse the Type Certificate issued or validated for the aircraft, aircraft component or item of equipment, or may require the incorporation of any modification as a condition of the Type Certificate remaining in force, as the case may be.