GS calculation
06-17-2007, 02:54 PM
#2
Gets Weekends Off
Joined APC: Nov 2005
Position: Guppy Capt.
Posts: 1,887
What's the angle? I use 5 x's the GS of the airplane for about a 3 degree angle,3/1 ratio... and that would give me a pretty good idearr. ie, 150 kt GROUND SPEED (not airspeed), I would hold around a 700 fpm descent, and would be OK.
06-17-2007, 03:00 PM
#5
Gets Weekends Off
Joined APC: Sep 2006
Position: FOD
Posts: 520
The actual formula, if you have something other than the typical 3-degree glideslope, is: (groundspeed/60)=(fpm/feet per nm). For the feet per nm, take your glideslope angle and multiply it by 100 (the 60:1 rule can be used to show that one degree at one nautical mile is 100 feet). So if you have, say a 3.5 degree glideslope, the feet per nm is 350. Sorry if this sounds confusing...but this is SUPER-easy on an E-6B.
06-17-2007, 03:03 PM
#6
Gets Weekends Off
Joined APC: Nov 2005
Position: Guppy Capt.
Posts: 1,887
Originally Posted by buffalopilot
that 5 rule works for a 3 degree Glide S. What if it was a 5 degree GS
60-1 rule for the DME Arc. At 60 DME, there is 1 mile between each radial. So at 30,it's 1/2 mile between each, at 15?....
06-17-2007, 03:09 PM
#8
Gets Weekends Off
Joined APC: Sep 2006
Position: FOD
Posts: 520
The DME is another SUPER-easy calculation on an E-6B, if you happen to have one of those lying around. Here's the setup: (DME/60)=(Distance Traveled/Degrees Traveled). Probably doesn't do you much good for an interview, but if you get some practice doing it a few times, you should be able to "mental math" your way through it.
06-17-2007, 05:38 PM
#10
Chief Jeppesen Updater
Joined APC: Oct 2005
Position: Executive Transport Driver
Posts: 3,080
Personally, if any interviewer asks you what your descent rate on a 5 degree glideslope is, I'd ask him to show me where such an approach is approved for the type of operation they run. As for enroute descents (the only place where you're likely to see anything close to 50 degree down angles), there are plenty of time/speed/distance to descend forumlas to work things out.
Minutia and BS questions in this day and age don't belong in an interview, IMHO. Ask yourself if you really want to work for a company that screens based on unrealistic questions and obscure knowledge- particularly in this day and age when just about any regional will hire you if you have a pulse and 500 TT.
Minutia and BS questions in this day and age don't belong in an interview, IMHO. Ask yourself if you really want to work for a company that screens based on unrealistic questions and obscure knowledge- particularly in this day and age when just about any regional will hire you if you have a pulse and 500 TT.
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