I was asked to plan a cross country flight from KTMB (Miami Executive Airport) to KTPA (Tampa International Airport). After doing all the planning, I realized I needed to calculate the fuel for an alternate airport.
According to 14 CFR 91.167, fuel is required from departing airport to intended destination airport, plus from intended destination airport to alternate airport, and another 45 minutes of flying at normal cruising speed.
In 1-2-3, if weather forecasts tell that 1 hour before and 1 hour after the ETA, the ceilings would be less than 2,000 feet and less than 3 statute miles visibility, I need to file an alternate airport.
But if the forecasts tell that at KTPA, the weather conditions will be better than that, would I still be required to calculate the fuel for an alternate?
If the conditions are worse than that, then how would I calculate the fuel to my alternate, which I chose to be KSRQ (Sarasota–Bradenton International Airport). Do I need to do again the SID at KTPA, then enroute and then STAR and approach at KSRQ, or just a direct flight?