When an AD superseded by a new one, Does the operator still retain the instruction of superseded AD even though the AD include repetitive action?
That sounds like a typical US AD where as I mentioned in a previous post, they don't issue "revisions", like AD 2019-12, AD 2019-12 Rev A, Rev B, Rev C etc. If the AD is basically the same but has some internal change, the FAA will not issue a "Rev A". They will issue a superceding AD with a new number that is the same as the old one except for various changes which will be spelled out. So AD 2019-23 will be replaced by AD 2019-32, which supercedes 2019-23, instead of 2010-23 Rev A, as would be done in Canada or elsewhere.
That language tells you that the new AD is issued with administrative changes and that the compliance requirements are the same as the superceded AD, including any repetitive instruction. In fact the new AD should have all the compliance requirements of the old one included in it.
Here’s an example of an AD that supersedes an older one. In this case the FAA decided that the requirement that an inspection be performed by an A&P was not necessary and that pilots were smart enough to check whether their fuel selector was labelled correctly. If you find the link to the old one on FAA website, it will show that it has been superseded. But you can still find the old pdf without any indication that it has been cancelled. If you are looking for a particluar AD, make sure you search in the current ADs section of their website. The naming convention differs from the Advisory Circular, FAA Order, and FAA publication method where the old ones are still on the website and the newest one has the highest letter, e.g. AC 61-65E, AC 61-98D, FAA Order JO 7400.9Z.
We are superseding Airworthiness Directive (AD) 2018-02-05 for certain Piper Aircraft, Inc. Models PA-28-140, PA-28-150, PA-28-151, PA-28-160, PA-28-161, PA-28-180, PA- 28-181, PA-28-236, PA-28-201T, PA-28R-180, PA-28R-200, PA-28R-201, PA-28R-201T, PA- 28RT-201, and PA-28RT-201T airplanes. AD 2018-02-05 required inspecting the fuel tank selector cover to verify the left and right fuel tank selector placards are located at the proper positions and replacing those that are improperly located with new placards. This AD addresses the same unsafe condition and requires the same actions as AD 2018-02-05, but changes the inspection of the fuel tank selector cover to a preflight check and allows for various fuel selector clocking configurations.