To be more precise, it is actually paragraph 9b.
You best read the whole AC start with para 16.
16. SUMMARY.
a. Owner/Operator Responsibility. The registered owner or operator of an aircraft is responsible for compliance with ADs for the airframe, engine, propeller, and appliance as stated in the applicability statement of the AD for all aircraft it owns or operates.
and then para:
10. AD COMPLIANCE. ADs are regulations issued under part 39. Therefore, no person may operate a product to which an AD applies, except in accordance with the requirements of that AD. Owners and operators should understand that to “operate” not only means piloting the aircraft, but also causing or authorizing the product to be used for the purpose of air navigation, with or without the right of legal control as owner, lessee, or otherwise. Compliance with Emergency ADs can be a problem for operators of leased aircraft because they may not be aware of the AD and safety may be jeopardized.
and then :
(5) “This AD applies to Lycoming Engines Models AEIO-360-A1A and IO-360-A1A.” This statement makes the AD applicable to the engine models listed that are installed on TC’d aircraft.
b. Non-TC’d Aircraft and Products Installed Thereon. Non-TC’d aircraft
(e.g., amateur-built aircraft, experimental exhibition) are aircraft for which the FAA has not issued a TC under part 21.
The AD applicability statement will identify if the AD applies to non-TC’d aircraft or engines, propellers, and appliances installed thereon. The following are examples of applicability statements for ADs related to non-TC’d aircraft:
(1) “This AD applies to Honeywell International Inc. Auxiliary Power Unit (APU) models GTCP36-150(R) and GTCP36-150(RR). These APUs are installed on, but not limited to, Fokker Services B.V. Model F.28 Mark 0100 and F.28 Mark 0070 airplanes, and Mustang Aeronautics, Inc. Model Mustang II experimental airplanes. This AD applies to any aircraft with the listed APU models installed.” This statement makes the AD applicable to the listed auxiliary power unit (APU) models installed on TC’d aircraft, as well as non-TC’d aircraft.
(2) “This AD applies to Lycoming Engines Models AEIO-360-A1A and IO-360-A1A. This AD applies to any aircraft with the listed engine models installed.”
This statement makes the AD applicable to the listed engine models installed on TC’d and non-TC’d aircraft.
Plus when the letter of limitations makes the ADs required
they will be complied with.
note the date of the AC,Date: 3/2/12 AC No: 39-7D
things are changing