IFR Enroute charts

Question 1

Brown airport symbol

Answer 1

Civil airport with no instrument procedures

Question 2

Green airport symbol

Answer 2

Civil airport with instrument procedures

Question 3

Blue airport symbol

Answer 3

Civil airport with civilian and instrument procedures

Question 4

Warning areas

Answer 4

Offshore weapon testing

Question 5

Alert areas

Answer 5

High volume pilot training

Question 6

Restricted

Answer 6

Part time military training

Question 7

MOA

Answer 7

Separates IFR traffic from military traffic

Question 8

How often are IFR enroute charts revised?

Answer 8

Every 56 days

Question 9

Star on an airport symbol

Answer 9

Part time tower operations, ATIS, part time or on demand lighting, and part time airspace

Question 10

MEA (minimum enroute altitude)

Answer 10

Ensures strong nav signal coverage and obstacle clearance

Question 11

MOCA (minimum obstruction clearance altitude)

Answer 11

Provides obstacle clearance and NAV signal reception is ensured within 22NM of the closest NAVAID defining the route.

Question 12

MRA (minimum reception altitude)

Answer 12

Lowest altitude at which an intersection can be determined from an off course NAVAID

Question 13

MCA (minimum crossing altitude)

Answer 13

Charted when a higher MEA route segment is approached

Question 14

MAA (maximum authorized altitude)

Answer 14

Highest altitude at which the airway can be flown with good signal reception

Question 15

Identifying intersections

Answer 15

An open triangle indicates the location of an ATC reporting point at an intersection
If the triangle is solid, a report is compulsory