|Quoting AS739X (Reply 12):|
Its has nothing to do with range. The CR7 does it very well.
It is a fuel range problem. For example, AUS
with an average 71 knot headwind:
takeoff fuel is 15600, or burn plus reserve, with no alternate, or holding fuel. This is without the added safety of contingency fuel. Add SMF
as an alternate, and you up the fuel by 1800 pounds. Add in contingency as a buffer against bad wind data or any unforeseen holding. I try to put in a minimum of 1500 pounds on the -700.
So add these up, and you get:
RLSF 18,900 pounds.
This only leaves 500 pounds to play with.
What if the closest legal alternate is LAX
? You'll top out the tanks, that's for sure, and possibility of burning into your reserve. Yes, you can use the reserve once in flight, but as far as planning purposes, you have little room to play with.
Two all beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun.