#### jspeed87

##### Well-Known Member
Very frustrating but if anyone wants to help me out, I would appreciate it.

(67.) If a magnetic heading of 170* is maintained and your ADF indicates (the needle is pointing towards 315*), What will be the relative bearing to the station when you intercept the 090* magnetic bearing to the station.

A. 260*

B. 270*

C. 280*.

Correct answer is C, but I am pulling my brain out as to why. I understand the MH+RB=MB to station. But the way they phrase it here is so confusing. I think bearing is the same as "radial" to VOR.

I think bearing is the same as "radial" to VOR.
Bearing to the station

MH + RB = MB
Mudhole + Rubber Boots = Muddy Boots

170 + RB = 090
RB = 090 -170
RB = -80

Since -80 is less than, add 360.

RB = -80 + 360
RB = 280

Or, you could do it this way (which is brute force, trying all of the possible answers and picking the only one that works):

MH + RB = MB
170 + 280 = MB
MB = 450

Because 450 is above 360 you have to correct by subtracting 690

MB = 450 - 360 = 090

MB = 090

You never used: My Hairy + Red Balls = Make Baby?

I have flown an aircraft with an ADF but never flown an NDB approach, I aim to fix that, but they are disappearing fast.

I remember holding over an NDB in IMC, partial panel and occasionally leaving the hold to do the approach only to return again and start all over. I did that with my first instructor for about 2 hours one day. NDB approaches are a different breed.

PK
There used to be a radio station that was used as a practice approach in AZ KCKY, now the state has none. (awful broadcasting but there you go)

http://aftw.org/Coolidge_NDB-A_KCKY.jpg

I'd love to get some proper non precision approach experience. As an instrument rated pilot, ILS and GPS doesn't cover everything. especially in Canada, South Africa etc.

I still dig the fact that you can tune into commercial radio while flying. I'd love to rig up an ADF as a radio for home, same for a Comm radio, listen to LHR approach... Just need some home electronics to make that happen.

Alex.

You never used: My Hairy + Red Balls = Make Baby?

I have flown an aircraft with an ADF but never flown an NDB approach, I aim to fix that, but they are disappearing fast.

I thought it was Mary Had + Roast Beef = Mary Barfed?

Bearing to the station

MH + RB = MB
Mudhole + Rubber Boots = Muddy Boots

170 + RB = 090
RB = 090 -170
RB = -80

Since -80 is less than, add 360.

RB = -80 + 360
RB = 280

Or, you could do it this way (which is brute force, trying all of the possible answers and picking the only one that works):

MH + RB = MB
170 + 280 = MB
MB = 450

Because 450 is above 360 you have to correct by subtracting 690

MB = 450 - 360 = 090

MB = 090

ahh I got it now, although I was trying to visualize it on paper it's just a math/algebra problem. What is point to these ADF questions when they are being replaced by GPS.

What is point to these ADF questions when they are being replaced by GPS.
So that one day you can call some young pilot a lil whippersnapper and explain how you had to calculate the MB in the snow, 5 miles, uphill both ways, in a nonstandard holding pattern without autopilot or gps

Exactly, just the ability to fly one is a more complex effort and more demanding of a pilots skills, we should seek out those challenges.

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