What is the modus operandi adopted for seeking Vigilance Clearance in AAI?

In the matter such as applications for renewal/issue of NOC for passport, permission for private visit abroad, forwarding of applications for appointment/ assignment/deputation outside the department, the concerned officials applies to the Personnel Directorate who in turn seeks Vigilance Clearance from the Vigilance Department as well as Disciplinary Cell at CHQ. In all other matters Personnel Department seeks Vigilance Clearance as a mandatory requirement.