Hi David, that is because methods 3 and 5 are more suitable for lower altitudes. Look at the example data...
Calculating TAS - Rules of Thumb page
29 May 2006 20:27 GMT - name: David Vail
The page containing rules of thumb for calculating True Air Speed displays 5 methods. Using 290 KIAS at FL350, I got the following results:
Rule 1: TAS = 465
Rule 2: TAS = 465
Rule 3: TAS = 493
Rule 4: not used
Rule 5: TAS = 402
Why such difference and which is probably closest?
The Aviary -DVD
14 Apr 2006 23:31 GMT - name: Gerald France
I heard that the FA who made the movie was fired for making it. What a drag
16 Feb 2006 20:35 GMT - name: George
I think that "The Aviary" is a cool movie and that the FA who got fired for making it will go on to do better things. www.theaviarymovie.com