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VOR/DME RNAV

VOR/DME RNAV. AST 241 Chapter 5. VOR'. Following VOR (Victor) airways on average results in 7 percent greater distance traveled point to point VOR/DME RNAV developed in the late 1960’s to alleviate this problem. RNAV Theory.

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VOR/DME RNAV

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  1. VOR/DME RNAV AST 241 Chapter 5

  2. VOR' • Following VOR (Victor) airways on average results in 7 percent greater distance traveled point to point • VOR/DME RNAV developed in the late 1960’s to alleviate this problem

  3. RNAV Theory • Course Line Computer (CLC)- takes VOR DME input and creates “phantom” waypoints in a straight line between any two points within range of the associated VOR’s

  4. RNAV Theory • Waypoints can be entered either of two ways: • Radial/Distance- Most Common, p.92 in text • Lat./Long. • Some units can hold 50 to 100 waypoints along different routes

  5. RNAV Theory • RNAV course- called a “desired track” • CDI sensitivity changes from enroute mode- one dot deflection = 1NM off course to approach mode- one dot deflection = a fraction of a mile (varies) • With RNAV the CDI sensitivity dosen’t change with distance from the waypoint- remains constant

  6. RNAV Applications- VFR • Airport Finder • Random routings • Descent manager

  7. RNAV Applications- IFR • Direct routes- easier to get once airborne- can ask for an initial on course heading from ATC • File /R on flight plan (usually) • Must be in RADAR contact for IFR nav. • No formal RNAV routing system in use today • At least one waypoint every 200 NM

  8. RNAV-IFR (ctn.) • Unit must meet AC 90-45 • Use standard arrival and dep. Routings • Use at least one route defining waypoint per ARTCC boundary and one no farther than the previous center boundary • Must circumnavigate restricted airspace by at least 3 NM • Flight above FL 390 must lat./long. wpts.

  9. RNAV- IFR (ctn.) • To find intersections- simply input the intersection as a waypoint and navigate direct to • Helpful to navigate along NDB airways and as a route cross-check along a Victor airway

  10. RNAV Future • Will be around for as long as the VHF airway system is in use F(at least until the year 2010). • After that- ?

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