Screaming_Emu
Well-Known Member
I wonder if that's a valid answer on the interview.
Mental math question
- Thread starter Dalma459
- Start date
I wonder if that's a valid answer on the interview.
TrustMeI'maPilot
Well-Known Member
That's what I was getting at. I know you can always take radar vectors, but if you can't navigate your way direct a VOR on your own outside the service area, how is that any different than trying to go direct some point in space without RNAV equipment?
Autothrust Blue
“If you jump on my shift, that’s just rude, man.”
You will eventually be able to go direct Volunteer on your own.
TrustMeI'maPilot
Well-Known Member
You're not understanding what I'm saying.
Yes you will eventually pick up the VOR, but when you can't, the only way legally to go direct is to take a vector. If you're not RNAV equipped, at what point would you pick up the radial/DME fix you're navigating to? Seems like a quick way to get a pilot deviation to me.
I had to take a entire class dedicated to this stuff in college, my opinion is most of this, like the pencil trick, is useless trivia that has no application in the real world.
Side note - not currently qualified for Delta or trying to get on, but if I was, I would know any mental math or nav trick down cold without any complaints and ask what else I need to know.
Cav
Former Maddog Whisperer
The point is not whether or not the mental math in question is applicable but whether or not you understand the "why" of what is done for us by computers today and probably more importantly....1) did you study and understand the concepts 2) can you apply those concepts under pressure on interview day.
In my experience the test questions were actually a little more simple than the gouge I had. That being said, understanding the gouge made the math portions of the test much easier.
In my experience the test questions were actually a little more simple than the gouge I had. That being said, understanding the gouge made the math portions of the test much easier.
BobDDuck
Island Bus Driver
They can't give you the clearance to begin with if you aren't RNAV/IRU equipped. The FARs require you to report the loss of any required navigational equipment in flight if it happens so they wouldn't give you that clearance after that. If they give you a vector it will be something like "fly heading XXX and proceed direct XXX upon receiving."
Cav
Former Maddog Whisperer
Ahh the old DC9 direct. Those were the days!
TrustMeI'maPilot
Well-Known Member
Trust me, I know how this stuff works and the legality behind. The point I have been trying to make is, you can't use a pencil trick to go direct to a point in space, so why do I need to know it? But I guess that's how aviation works.
And again, I understand this is a Delta question on a Delta test and they have every right to ask whatever they want. I'm just making a statement because I run into pilots all the time that think knowing trivia like this is vital to operating an aircraft.
Are you saying that you can't fly to a VOR that you are not receiving when not equipped with RNAV?
ClarkGriswold
Non Nutritive Cereal Varnish Engineer
Situational awareness?
No idea how to do this mentally aside from just visualizing the picture and knowing that its between 190 and 210. But regardless heres the trig:
Pythagorean Theorm: A2 + B2 = C2
20^2 + 60^2 = 4000. SquareRoot(4000) = 63.25
At this point you can already tell the heading will be between 190 and 210ish.
Now you must solve for the angle that will give you the heading(or course).
TrustMeI'maPilot
Well-Known Member
Yes.
I guess that makes some sense. I know personally I've never needed something like it for SA but it could very well work for others.
How would you fly an airway with a MEA Gap in a /A aircraft?
No idea how to do this mentally aside from just visualizing the picture and knowing that its between 190 and 210. But regardless heres the trig:
Pythagorean Theorm: A2 + B2 = C2
20^2 + 60^2 = 4000. SquareRoot(4000) = 63.25
At this point you can already tell the heading will be between 190 and 210ish.
Now you must solve for the angle that will give you the heading(or course).
Now plot those points on a sectional and find the magnetic course between them. You should get 207.
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TrustMeI'maPilot
Well-Known Member
Talking about a direct to clearance, not a charted airway.
charlie1017
Well-Known Member
Pythagorean Theorem (on flat Euclidean geometry) only works for triangles where one of the angles is 90 degrees i.e. a right triangle:No idea how to do this mentally aside from just visualizing the picture and knowing that its between 190 and 210. But regardless heres the trig:
Pythagorean Theorm: A2 + B2 = C2
20^2 + 60^2 = 4000. SquareRoot(4000) = 63.25
At this point you can already tell the heading will be between 190 and 210ish.
Now you must solve for the angle that will give you the heading(or course).
http://en.wikipedia.org/wiki/Pythagorean_theorem
For non-right triangles in flat Euclidean geometry, use Law of Cosines:
http://en.wikipedia.org/wiki/Law_of_cosines
Jussst sayyyin =)
dasleben
That's just, like, your opinion, man
First guy who whips out a scientific calculator in the cockpit does NOT get invited for beers after the flight.No idea how to do this mentally aside from just visualizing the picture and knowing that its between 190 and 210. But regardless heres the trig:
Pythagorean Theorm: A2 + B2 = C2
20^2 + 60^2 = 4000. SquareRoot(4000) = 63.25
At this point you can already tell the heading will be between 190 and 210ish.
Now you must solve for the angle that will give you the heading(or course).
Johnny Beau Bekkestad
Well-Known Member
departure (E/W) in NM = ∆ longitude (in minutes) x cosine latitude
(earth) convergency = ∆ longitude x sine mean latitude
conversion angle = ½ x convergency
And going N/S every LAT is 60NM
(earth) convergency = ∆ longitude x sine mean latitude
conversion angle = ½ x convergency
And going N/S every LAT is 60NM
good catch
First guy who whips out a scientific calculator in the cockpit does NOT get invited for beers after the flight.
thats ok. i would never lower myself to beer after enjoying only the finest organtic french bordeaux wines. *swirls glass*