When must ADs be complied with?

When must ADs be complied with?

• A. All ADs must be complied with only if the AD states 'mandatory'.
• B. ADs must be complied with within 40 days.
• C. ADs are optional.
• D. All ADs that apply to the affected product must be complied with in accordance with the instructions of the AD and in the timeframe specified by the AD.

Answer: (D)

Airworthiness Directives are enforceable safety requirements issued by the aviation authority to address unsafe conditions. When an AD applies to your aircraft, engine, propeller, or a specific part, you must follow every instruction it contains and complete the actions within the timeframe it specifies. The directive tells you exactly what to do (inspection, modification, replacement, etc.), how to do it (approved methods, procedures, torque values), and when it must be done. Some ADs require immediate action, while others specify a date, flight hours, or calendar time to complete the work. If more than one AD applies, each applicable directive must be complied with in its own stated schedule. This is why the correct approach is to adhere to all applicable ADs and follow the timings laid out in each directive. The other choices imply optionality or a universal 40-day window, which doesn’t reflect how ADs work—their applicability and timing are determined by the directive itself.

Airworthiness Directives are enforceable safety requirements issued by the aviation authority to address unsafe conditions. When an AD applies to your aircraft, engine, propeller, or a specific part, you must follow every instruction it contains and complete the actions within the timeframe it specifies. The directive tells you exactly what to do (inspection, modification, replacement, etc.), how to do it (approved methods, procedures, torque values), and when it must be done. Some ADs require immediate action, while others specify a date, flight hours, or calendar time to complete the work.

If more than one AD applies, each applicable directive must be complied with in its own stated schedule. This is why the correct approach is to adhere to all applicable ADs and follow the timings laid out in each directive. The other choices imply optionality or a universal 40-day window, which doesn’t reflect how ADs work—their applicability and timing are determined by the directive itself.