The action required by an AD may take what form?

The action required by an AD may take what form?

• A. Inspection
• B. Part replacement
• C. Design modification
• D. All of the above

Answer: (D)

An Airworthiness Directive requires actions to correct an unsafe condition in an aircraft or its components, and those actions can take several forms. The directive may mandate an inspection to verify whether the condition exists or to assess its extent, replacement of parts that are worn or defective, or a design modification to eliminate the root cause and prevent recurrence. Often an AD may require more than one of these actions, or a combination of inspection, replacement, and modification, which is why all of the listed forms can be mandated. Compliance is mandatory and time-bounded, with specific instructions on how and when to perform the actions, and it may specify alternative means of compliance if approved.

An Airworthiness Directive requires actions to correct an unsafe condition in an aircraft or its components, and those actions can take several forms. The directive may mandate an inspection to verify whether the condition exists or to assess its extent, replacement of parts that are worn or defective, or a design modification to eliminate the root cause and prevent recurrence. Often an AD may require more than one of these actions, or a combination of inspection, replacement, and modification, which is why all of the listed forms can be mandated. Compliance is mandatory and time-bounded, with specific instructions on how and when to perform the actions, and it may specify alternative means of compliance if approved.