Rules of thumb
Does anybody have any useful rules of thumb? For example this is one that I was told the other day:
Whilst flying a normal (assume 3º glide) approach, the last point at which you should put the gear down to achieve stability criteria before touchdown is calculated as so:-
Look at the g/s from your Nav. Display and multiply by 10, then add the runway elevation to give you the answer in feet (QNH). I fly the A319 and incredibly it seems to work.
Example:
Thr. elevation = 1500ft
Groundspeed = 190 Kts
190 X 10 = 1900
plus elevation of 1500 ft = 3400' AMSL.
Below this point the a/c will not slow down quick enough to be stable at 1000 ft AAL.
FJ