Archives: Theory Courses

18.46.12 Calculate the latest time of departure for a given

18.46.12 Calculate the latest time of departure for a given VFR cross-country flight or a given
leg.
Sub Topic Syllabus Item
Navigation Procedures  VFR

.

(b) a Lambert’s conformal projection

a

(a) a Mercator projection

a

18.28.6 Calculate time, speed, or distance, given two factor

18.28.6 Calculate time, speed, or distance, given two factors.

These 3 items are interchangeable eg. If Speed and Time is known, the Distance can be calculated. 

With Distance travelled in a nominated Time, a Speed can be worked out

Distance travelled divided by the Speed gives us a Time

(e) flight level (FL)

a

18.10.6 Plot and reference a position ( 0.5 of a minute) on

18.10.6 Plot and reference a position ( 0.5 of a minute) on a current published New Zealand
Aeronautical Chart.

18.8.2 Define: (f) true airspeed (TAS)



The true airspeed (TAS; also KTAS, for knots true airspeed) of an aircraft is the speed of the aircraft relative to the airmass in which it is flying. 




speeds



 
        

         
    

     

    


  


    

        
(f) Greenwich (Prime) Meridian


         
    


     
    

        
The Prime Meridian, based at the Royal Observatory, Greenwich, is a Meridian of longitude located on the 0° longitude line. It acts as a datum for longitude, increasing from 0° to 180° when moving East, and decreasing from 0° to -180° when

    moving West.  






















prime meridian 




 
        

         
    

     

    


  


    

        
– PNR


         
    


     
    

        
[vfr_Insert p1=”PNR Quiz”]

 
        

         
    

     

    


  


    

        
ETP – Head wind Example


         
    


     
    

        


In this example we take look at working out a ETP,


With TAS of 200kts and Head wind of 40kts over distance over 800nm. 


.
Distane to to ETP is : 480

			
			
			A
			
			B
	TAS of 200kts, Distance 800nm
					
					<-<- Head-Wind of 40kts
					
					
						
						480nm <- ETP -> 320nm
					
					
Example of ETP.
Nav Computer setup

              
                10101111121213131414151516161717181819192020212122222323242425253030353540404545505055556060707080809090GS Home 240GS Out 160+Home 240=400read off ETP  = 480 nm locate Distane of 800Note the % of DistaneCheck out [10]
By checking the 1 and read off a percentage distane a long your track where the ETP is.
This a handy check, to double check the ETP has moved toward the wind .
As Double Check, just confirm that the times for each legs are the same. 

              
                10101111121213131414151516161717181819192020212122222323242425253030353540404545505055556060707080809090GS Out 160 1 Hour locate Distane of 320read off Time = 120 Minutes

              
                10101111121213131414151516161717181819192020212122222323242425253030353540404545505055556060707080809090GS Home 2401 Hourlocate Distane of 480read off Time = 120 Minutes