The Design Signatory should meet the following requirements:

(a) possess professional and technical qualifications, and knowledge appropriate for the activity; and at least 5 years of recent engineering experience (one year of this experience should be on engineering work on civil aircraft and in a field similar to that for which the approval is held);

(b) possess knowledge of the appropriate Singapore aviation legislation and airworthiness design standards as listed in Singapore Airworthiness Requirements, Part 21 (SAR-21) Subpart I. Knowledge of aviation legislation may be demonstrated by passing the CAAS' examination papers on Airworthiness Administration (L11), or Aviation Legislation (M10) or by attending L11 or M10 courses conducted by an approved maintenance training organisation;

(c) hold a position of sufficient authority in the organisation to ensure adequate control over designs within the relevant area of responsibility.