IFR Enroute Charts

Question 1

Enroute charts

Answer 1

•Keep track of your position
•Gives helpful information
•Safe altitudes, obstruction clearance
•Position information
•Navigation reception

Question 2

Different types of Enroute charts

Answer 2

•Low Altitude
•Airways below 18,000 ft MSL
•Victor airways
•High Altitude
•18,000 ft MSL and above
•Jet routes

Question 3

What Enroute charts show and don’t show

Answer 3

•Greatly Simplified
•Does not show:
•Obstruction heights
•Roads
•Cities and Towns
•Does show:
•Major bodies of water
•Airports

Question 4

Airports on Enroute charts

Answer 4

•Green : Low Altitude Instrument Approaches
•Brown: No Instrument Approach

Question 5

Airspace on Enroute charts

Answer 5

•Class B- Shaded in blue with a solid blue line
•Class C- Shaded blue with a dashed blue line
•Class D- Not always depicted
•Class E- All the white

Question 6

Special use airspace

Answer 6

•Prohibited/ Restricted/Warning:
•Blue crosshatch
•MOAs:
•Brown crosshatch

Question 7

Navigational aids on Enroute charts

Answer 7

•VOR/VORTAC
•Compass rose offset for variation
•VOR Name
•Frequency info
•Morse ID
•GPS Coordinates
•NDB
•Brown on chart
•ILS:
•Localizer symbol shows ILS, MLS, LDA, and SDF
•Crosshatch = front course
•Solid = back

Question 8

Victor airways

Answer 8

•V stands for VHF
•Even numbered airways run East and West
•Odd numbered airways run North and South
•8 nautical miles wide
•If the airway is further than 51 nautical miles from the nearest VOR, the width is expanded to include airspace 4.5 degrees angle from center of navaid.

Question 9

Victor airway symbology

Answer 9

•Total Distance
•Boxed
•Waypoints
•Shown by a fix (△)
•Checkpoints along an airway
•For you and ATC to check the progress of your flight
•Five letter names
•Can be based off of two VORs, DME, or other navaids

•Reporting Points
•Compulsory
•Must Report if not in radar contact or as requested by ATC
•Noncompulsory
•Must report only if requested by ATC

Question 10

Minimum Enroute altitude (MEA)

Answer 10

•Lowest altitude between radio fixes which guarantees navigation reception and obstruction clearance
•Does not ensure communication

Question 11

Minimum obstacle clearance altitude (MOCA)

Answer 11

•Ensures a reliable navigation signal only within 22 miles of the facility
•Obstacle clearance along the entire route

Question 12

Maximum authorized altitude (MAA)

Answer 12

•Guarantees you will receive only one VOR
•Prevents navaid interference

Question 13

Off route obstacle clearance altitude (OROCA)

Answer 13

•Provides obstruction clearance within designated lat/long grids.
•1000 feet in non-mountainous
•2000 feet in mountainous

Question 14

Minimum reception altitude (MRA)

Answer 14

•Lowest altitude on an airway segment where an aircraft can be assured to have navigation aids.
•The greater the distance between navaids the higher the MRA.

Question 15

Change over point (COP)

Answer 15

Change of frequencies other than the midpoint

Question 16

Minimum crossing altitude (MCA)

Answer 16

•Must be at or above altitude before crossing the fix