Maintenance Controller reported misdirection when assisting technicians in a remote repair via telephone and missed an RII required task.

Narrative

Aircraft X flew into ZZZ with a COMM 1 and 2 issue. During much troubleshooting; the crew and mechanics reported seeing an 'ADC' (Air Data Computer) Amber msg on both PFDs. The COMM issue was resolved; then we began troubleshooting the ADC msg. During troubleshooting; I had the Mechanics power off the aircraft for around 30 minutes. When the Mechanics returned to the aircraft; I then had them disconnect both ADC Cannon Plugs and wait another 5 mins before powering on. I did not consider this to be an 'Installation' of the ADCs as is marked in the Required Inspection Item (RII) List. The Mechanics reconnected the Cannon Plugs and continued troubleshooting; as the Aircraft Power Down was not a fix. Later still during troubleshooting; the ADC Ops check was performed by a non-RII Mechanic; which at the time i did not realize was an RII Task.I will familiarize myself more with the RII List and be sure to always check and double check the List when sending roadtrips or asking Mechanics to perform tasks. I missed the 'System Check' Field of the ADC RII Listing before asking mechanics to perform the ADC Ops Check.