navigation questions
 

1. An aircraft flying a constant hdg with 5 deg. Starboard drift making good a track parallel to the center line of the airway, but 5nm to the right of the centerline, find ADF reading from an NDB situated 30 nm ahead of the centerline of the airway.


2. An aircraft flying a constant hdg with 8 deg. port drift making good a track parallel to the center line of the airway, but 5nm to the right of the centerline, find ADF reading from an NDB situated 30 nm ahead of the centerline of the airway.

Tricky - here goes

1 345

2 358

how the hell did u work that out, more to the point :eek:

Not sure that my answers are correct, but this is how I worked it.

In both cases the plane is 5nm right of track at 30 NM, therefore 10 nm right of track at 60 nm. 1 in 60 rule says that's 10 degrees off the NDB. So if there was no drift the ADF would show 350 (10 degrees right).

However in first case drift is 5 degrees to the right so 5 comes off the reading 350 - 5 = 345

In the second case drift is the other way 350 + 8 = 358, 2 degrees left of the nose.

ah, makes sense, fixed card ADF :O

Now, doesn't right drift = crabbed to the left? In which case question 1 is 355 and question 2 is 342.

It depends what you read into "starboard drift" and "port drift". You may well be correct, if so I agree with your answers.

To me I apply starboard drift to a wind coming from the right but lets see what the other "experts" say.........

Stupid questions! (No offense intended Sunny!)

Nobody in their right mind would be tracking on an NDB - this is 2008 after all.

Just push the "Direct To" button on your GPS.

Dr :8

yeh it is, but its exam question,

I am curious as to where you got the "track" to start with? Centreline of the airway, to me does NOT mean 360/000.

I stand to be corrected!

It's an exam question, so I suppose the (multiple choice) answers specify answer in °Relative.

QF2 would get the answer right in the exam.
FTDK would get the job at the interview... :p (5nm off track within 30nm of an on-airway navaid? In what universe?)

You don't require the actual track to answer the question. The ADF card is set to 000/360 and ADF readings taken relative to that.

Required knowledge for IREX exam.

If you are not rated on GPS or don't have a GPS in the aircraft what are you expected to do at a NDB only airfield? Let me guess - get a GPS! And when the GPS croaks what then......

Now Benty - you (should?) know as well as I do that you don't need to be able to answer stupid question like that to track inbound to an NDB, and fly an NDB appr.

Dr :8

So doesnt that make it 180 on those answers?

Silly English test. :ugh:

Tune up the NDB on that old valve powered ADF thingy and point the needle in the right spot......then the plane gets there too!:p

If thats too hard, refer to FTDK's most appropriate solution. And if you are spoiled enough follow the magenta line it gives you!

And Benty.....when it croaks it, pull out the spare GPS, you should have 3 ya know:E

J:ok:

The NDB is ahead, so the ADF reads on the "top" side of the dial. The questions seek the ADF reading - not a bearing from the NDB to the aircraft.

You could be assuming the aircraft is on a northerly track (not stated) and calculating the bearing from the NDB back to the aircraft.

forgive me for being pedantic, but I cannot see in the question where it states " on a fixed card adf...."

I do agree with ...."STUPID QUESTION"!

It doesn't say it in this question, it's a presumption. In the CASA exam they definitely state what sort it is.

What then are your answers to the original questions?

No "depends" about it. Starboard drift is when you are drifting to the starboard, i.e., the wind is from the port, easiest way to remember is the starboard wing is forward on the track made good. Port drift is the opposite.

In question one, 5 deg starboard drift means the nose is pointing 355 relative to the TMG, the NDB is 350 relative to the TMG (1/60 rule) which makes the NDB bearing 355 relative to the aircraft.

Question two is 342 relative.

In other words, QF2 has it right.