Airworthiness Directives must be treated in maintenance records as:

• A. They are voluntary to record
• B. They are advisory and optional
• C. They are enforceable but not recorded
• D. They are mandatory and must be recorded in all maintenance records

Answer: (D)

Airworthiness Directives are legally binding orders issued to address unsafe conditions. When an AD applies, you must comply and record that compliance in the aircraft’s maintenance records. The entry should note the AD number, the date, and the work performed (inspection, modification, replacement), along with the technician’s sign-off. This documentation is required because AD compliance directly affects airworthiness and must be verifiable by regulators and maintenance personnel. Therefore, ADs are mandatory and must be recorded in all maintenance records.