Originally Posted by
peekay4
The problem is that the intended airport may close for reasons other than weather. Security situations, accidents, fires, ATC or NAV/COM issues, natural disasters, etc.
So it's a good idea to always have enough fuel to reach an alternate airport, plus reserves, even if not required by regulations.
So let's consider a situation where you plan to destination with marginal weather and plan an alternate that is CAVOK.
You get to destination, weather is below limits so you hold until reaching your diversion fuel and divert to your single runway CAVOK alternate arriving with final reserve fuel. However, this now closes for reasons other than weather... what is the difference in that and arriving at a 2 runway airport with final reserve plus a bit in hand (providing the weather at destination is well above limits as stated in my previous post)?