Airworthiness and Requirements - Type Certificates

21 October 2026, Andreas Strohmayer

Airworthiness directives (AD)

... shall be issued by the agency when:

• unsave condition has been determined by the agency to exist in an aircraft, as a result of a deficiency in the aircraft, or an engine, propeller, part or appliance installed in this aircraft and:
• that condition is likely to exist or develop in other aircraft

when an airworthiness directive has to be issued by the agency to correct the unsafe condition or require the performance of an inspection, the holder of the type-certificate shall:

• propose the appropriate corrective action or required inspections
• following the approval of the agency, make available to known operators or owners descriptive data and accomplishment instructions

an application for a type-certificate shall be made in a form and manner established by the agency and shall include:

• detailed description of type design
• proposed operating characterstics and limitations
• intended use
• proposal for initial type-certification basis
• proposal for the assessment of the meaningful groups of compliance demonstration activities and data
• project schedule including major milestones

Abbreviations

Eqivalent Level of Safety (ELOS)

Type Certificate (TC)

Airworthiness Directive (AD)

Type Certification Data Sheet (TCDS)