Inop nav lights and the law

[Squealing Pig]

Had a tech issue a few nights ago regarding nav lights that prompted a recollection of a rule from my dim and distant ATPL writtens days where you could still depart at night with a nav light inop only with agreement of ATC

I can’t seem to locate it in the ANO and just curious if the rule exists or ever did exist.

Can anybody throw some light on the subject or tell me where to find the rule?

Thanks

PS Good job there’s 2 bulbs in each wingtip....