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interview question--formula?

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regionalcap

Well-known member
Joined
Jan 27, 2002
Posts
903
What are the forumlas to solve these two questions?

[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 radial at 20 DME. What heading would you fly to go direct to the 60 DME fix on the 190 redial of the same VOR?[/FONT]
[FONT=Arial, Helvetica, sans-serif][/FONT]
[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 bearing to the station. The wind is 360 at 50. What heading will you need to fly to track inbound to the same VOR on the 270 degree redial from the station?[/FONT]​
 
who in the world would ask that nonsense in an interview? That sounds like an oral question for the Europeans who like to talk more than fly.
 
go post this on the regionals board...you might get a BS question like this at one of those interviews. If a major airline starts asking you crap like this then it will not be a good place to work.

Later
 
What are the forumlas to solve these two questions?

[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 radial at 20 DME. What heading would you fly to go direct to the 60 DME fix on the 190 redial of the same VOR?[/FONT]​


[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 bearing to the station. The wind is 360 at 50. What heading will you need to fly to track inbound to the same VOR on the 270 degree redial from the station?[/FONT]​


Turn in the general direction and use the TLAR rule."

That Looks About Right.....
 
What are the forumlas to solve these two questions?

[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 radial at 20 DME. What heading would you fly to go direct to the 60 DME fix on the 190 redial of the same VOR?[/FONT]​


[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 bearing to the station. The wind is 360 at 50. What heading will you need to fly to track inbound to the same VOR on the 270 degree redial from the station?[/FONT]​

235 and 040
 
What are the forumlas to solve these two questions?

[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 radial at 20 DME. What heading would you fly to go direct to the 60 DME fix on the 190 redial of the same VOR?[/FONT]​


[FONT=Arial, Helvetica, sans-serif]Q: You are on the 090 bearing to the station. The wind is 360 at 50. What heading will you need to fly to track inbound to the same VOR on the 270 degree redial from the station?[/FONT]​

1) 220~215 deg in no wind condition
2) Cannot determine the exact wind correction heading without knowing the speed of the acft.

[TLAR]

WHO IS ASKING YOU THESE QUESTIONS?:eek:
 
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1) 220~215 deg in no wind condition
2) Cannot determine the exact wind correction heading without knowing the speed of the acft.

[TLAR]

WHO IS ASKING YOU THESE QUESTIONS?:eek:

Disclaimer: I am not liable for the answers provided; I had to administer myself 1/2 of the bottle shown in the avatar before being capable to formulate the answers.
 
1. ~200, basic pencil method fix-to-fix (T-37 Instr Training)
2. Need to know TAS, formula is Drift=Crosswind*60/TAS
 
Answer: With all due respect sir, you are in desperate need of HOBBIES.

If he laughs, that is a place you want to work for. If he doesn't, you don't want that job
 
Question 1:
As an engineer heading = 180+arctan((20+60sin10)/(60cos10)) in no wind
As a pilot "about 210 give or take"

Question 2:
Whatever heading I am currently on if I'm tracking the 090 bearing to the station.
 
Last edited:
Question 1:

Here is a mathematically exact formula:

let (DME_1,Radial_1) = Aircraft position
and (DME_2,Radial_2) = Destination

Bearing=mod(atan2(DME_2*sin(Radial_2)-DME_1*sin(Radial_1),DME_2*cos(Radial_2)-DME_1*cos(Radial_1)),360)

The distance formula (law of cosines) a little simpler.

Distance=Sqrt(DME_1^2+DME_2^2-2*(DME_1)(DME_2)*cos(Radial_2-Radial_1))

Many scientific calculators have built in polar to rectangular conversion functions. Converting both points to rectangular, and then converting (x_2-x_1,y_2-y_1) back to polar will yield the same results.

The bearing from (20,90) to (60,190) is 207 degrees. If there's no wind and the aircraft is already flying in this direction, then that is the heading to fly. Otherwise, you must correct for wind and the aircraft turn radius.

For turn radius use this:
r=v^2/(g*tan(b))
or
radius(nm)=(TAS(kt)/262)^2/tan(bank angle)

Here are some wind triangle formulas: http://williams.best.vwh.net/avform.htm#Wind


Question 2:

As others have stated, the answer is dependent on the true airspeed, but the answer can be expressed as a simple formula since the wind is perpendicular to the course:

sin(wca)=WS/TAS
or
Heading=090-arcsin(50/TAS)
 

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