Full Version: Landing A B737-400
im just quite sad that after so many years ive not encountered a crash on my landings but why now i do have this even though i do land properly wit a proper speed and speed brakes armed and etc.. but why anyway, any suggestions? say im 28NM away from the active runway at which rate of descent will i execute will i decrease my engines to idle so that i can reach the apprpoach speed of 147KTS>? or what? my problem is i descend too late
QUOTE(Ranger @ Jan 12 2008, 10:52 PM) 
3X the altitude that you want to lose plus 1 mile for each 10 knots of airspeed that you might want to lose. Example:
Level at FL 310 and cleared to cross a fix at 9,000 feet. 31,000' minus 9,000'= 22. 22 X 3= 66 miles. If we assume that we're in the U.S., we need to slow to 250K before we descend below 10,000'. If we are descending at 300K then we need to lose 50K before we descend below 10,000'. That's another 5 miles. Sooooo, 66 + 5 miles= 71 miles. Even with the FMS this mental exercise sould ALWAYS be done. Why? Because occasionally the automation reaches back and screws you.
Level at FL 310 and cleared to cross a fix at 9,000 feet. 31,000' minus 9,000'= 22. 22 X 3= 66 miles. If we assume that we're in the U.S., we need to slow to 250K before we descend below 10,000'. If we are descending at 300K then we need to lose 50K before we descend below 10,000'. That's another 5 miles. Sooooo, 66 + 5 miles= 71 miles. Even with the FMS this mental exercise sould ALWAYS be done. Why? Because occasionally the automation reaches back and screws you.
where did you get the 22.22? isnt th answer is 21,000? hmmm is it the altimeter?
QUOTE(airlinefanatic @ Feb 7 2008, 06:38 PM)
where did you get the 22.22? isnt th answer is 21,000? hmmm is it the altimeter?
31000 minus 9000 = 22000
22x3 = 66
66 Miles to descend from 31000 to 9000.
You have to add 1 mile for every 10 knots of airspeed you have to lose.
300 knots minus 50 knots = 250 knots.
10 goes into 50, 5 times.
To slow from 300 knots to 250 knots will take 5 miles.
So to descend from 31000 feet at 300 knots, to 9000 feet at 250 knots you need to start your descent 71 miles from the fix.
66 miles + 5 miles = 71 miles.
oops sorry haha yeah hmmm how stupid or am i just a carelss person thanks pals haha now i gewt it 
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