If an aircraft originally certificated in the standard category is altered to the restricted category, what must be done regarding Airworthiness Directives (ADs)?

When an aircraft that was originally certificated in the standard category is altered to the restricted category, it is essential to comply with all applicable Airworthiness Directives (ADs). This requirement stems from the fact that ADs are legally binding directives issued by the FAA to address unsafe conditions in aircraft, engines, propellers, or appliances. The responsibility to comply with these directives remains with the aircraft owner or operator regardless of any change in category, as the ADs are intended to ensure the ongoing safety and airworthiness of the aircraft.

While there might be some flexibility in how certain maintenance practices are approached in a restricted category, the multiplicity of potential safety concerns typically linked to ADs necessitates strict adherence to them. Therefore, all previously applicable ADs must still be complied with to maintain airworthiness and safety standards, emphasizing the importance of regulatory compliance in aircraft operations throughout their lifecycle, irrespective of category changes.