Two words... Preventative maintenance.

-Blue skies and a tail wind

"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?
Its getting old finding the lights burned out during preflight and
everything is closed.