Lucas Li - 1.3.1.A IntroRadioNavigation
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University Of Chicago *
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561
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English
Date
Apr 3, 2024
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Activity 1.3.1 Radio Navigation
Introduction
Have you ever experienced the panic of being lost? If you have never been lost, can you imagine
how scary it might be? Now imagine being lost in an aircraft. To avoid this life-threatening
experience, pilots use a variety of instruments and tools to navigate the open sky. Pilots often use
a Very High Frequency Omnidirectional Range Station (VOR). A VOR is a device that aids a
pilot’s navigation by providing bearing information based upon the transmission of two VHF
signals, one that rotates and one that is stationary. In this activity you will use VOR system
information to determine location.
Equipment
●
Course binder
●
Activity 1.3.1 Radio Navigation presentation
●
ruler
Procedure
1.
Plot the position of an aircraft displaying these VOR readings on the attached Chicago
sectional map.
1.
© 2011 Project Lead The Way, Inc.
Aerospace Engineering Activity 1.3.1 Radio Navigation – Page 1
2.
What landmark (town) is located under your aircraft? ___Potter____
3.
Your aircraft is located at 5,500 MSL above the location plotted in step 1. What will the DME
device display if you are tuned to the Falls VOR-DME? Sketch and calculate this in your
engineering notebook. Note that you researched this NavAid during your pre-flight planning.
You know that the Falls VOR-DME is located at an elevation of 740 ft. Note that 1 nm = 1.15
statute miles = 6076 ft.
1 tick mark = 1 nautical mile
Measures 25.2 nm approximately = 153118.1 ft
Total elevation increase = 5500 - 740 = 4760 ft
USE PYTHAGOREAN THEOREM. HYPOTENUSE = what the DME will display.
sqrt(153118.1^2+4760^2) = 153178.87 ft =
25.21 nm
© 2011 Project Lead The Way, Inc.
Aerospace Engineering Activity 1.3.1 Radio Navigation – Page 2
4.
Plot the position of an aircraft displaying these VOR readings on the Chicago sectional map on
the following page. Use a pencil and ruler.
© 2011 Project Lead The Way, Inc.
Aerospace Engineering Activity 1.3.1 Radio Navigation – Page 3
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5.
Label the VOR instrument with the heading and flag indicator as if you were flying over
Dundee (located below the center of the map). The VOR instrument is tuned to the Falls
VOR-DME.
Conclusion
1.
What important factors must a navigator consider when selecting VOR sites?
When a navigator selects VOR sites, he or she must consider which sites are closer to the
airplane and which sites are more accurate.
2.
What important considerations do Non-Directional Beacons (NDB) present?
An important consideration is that the slant angle does not impact the horizontal range because
the NBD must be far enough from the aircraft.
3.
How accurate would your DME reading be if your aircraft was flying 5,500 ft above Howard’s
Grove and you tuned your DME to Falls VOR-DME?
My DME reading would be farther than the horizontal range would be if my aircraft was at 5500 ft
above Howard’s Grove and I tuned my DME to Falls VOR-DME.
© 2011 Project Lead The Way, Inc.
Aerospace Engineering Activity 1.3.1 Radio Navigation – Page 4