"Mutts" wrote in message ...

Any rental pilot/flying club types out there carrying spare postion
light bulbs with them? Do you have to be an A&P to change them? Do
owners frown on replacing bulbs without being informed first?
How hard is it to change them on Archers and 172s?

The bulbs are trivial to replace and is an owner/pilot permitted maintenance.
While your skirting legality doing it in a rental, if I had the bulb I would certainly
not hesitate to do it if it meant having to otherwise cancel a night or IFR flight.