Descent formulas

[CLARKGRSWOLD]

• If you are 200 miles out @ 310, ATC wants 110 @ 40 DME, when do you descent ( I WAS THINKING 80 MILES BEFORE THE 40 DME, ANY INSIGHT ? )
• At 2000 feet on localizer, 5 miles back, where do you expect glideslope to be (This one is confusing 5 miles back from where ? Typical 3:1 here however )

 

[RJLoser]

Thousands of feet to descend: 20
Times 3
=60 miles out from fix
Ground speed times 5
GS:500kts
=60 miles out at 2,500fpm

 

[Stifler's Mom]

Start down at 100 DME (20K feet to lose) 20 x 3 = 60 miles. 5 x's your Ground Speed for the decent rate.

 

[CLARKGRSWOLD]

Thanks, I was (waggin) off the top of my head

 

[Flyer1015]

• If you are 200 miles out @ 310, ATC wants 110 @ 40 DME, when do you descent ( I WAS THINKING 80 MILES BEFORE THE 40 DME, ANY INSIGHT ? )
• At 2000 feet on localizer, 5 miles back, where do you expect glideslope to be (This one is confusing 5 miles back from where ? Typical 3:1 here however )

You live and die by the gouges. AA isn't hiring, but will soon. Don't be a 100% Gouge guy.

 

[WWEfan]

Just use the banana bar. Sheesh.

 

[RJLoser]

Just use the banana bar. Sheesh.

This!!!

Nothing like looking up and seeing the Vnav at 4,000+ though.

 

[blesko]

• If you are 200 miles out @ 310, ATC wants 110 @ 40 DME, when do you descent ( I WAS THINKING 80 MILES BEFORE THE 40 DME, ANY INSIGHT ? )
• At 2000 feet on localizer, 5 miles back, where do you expect glideslope to be (This one is confusing 5 miles back from where ? Typical 3:1 here however )

[/QUOT
Glide slope will be above you as you must intercept below the GS due to a possible side lobe of the 90/150 Hz amplitude phases.

 

[ChickenSled]

• If you are 200 miles out @ 310, ATC wants 110 @ 40 DME, when do you descent ( I WAS THINKING 80 MILES BEFORE THE 40 DME, ANY INSIGHT ? )
• At 2000 feet on localizer, 5 miles back, where do you expect glideslope to be (This one is confusing 5 miles back from where ? Typical 3:1 here however )

[/QUOT
Glide slope will be above you as you must intercept below the GS due to a possible side lobe of the 90/150 Hz amplitude phases.

What? What college are you pretending you went to?

 

[Salukipilot4590]

Point nose down, go down.