AIM
12/2/21
FIG 9
−
1
−
4
Helicopter Route Charts
b. IFR Navigation Charts.
1. IFR En Route Low Altitude Charts
(Conterminous U.S. and Alaska).
En route low
altitude charts provide aeronautical information for
navigation under IFR conditions below 18,000 feet
MSL. This four
−
color chart series includes airways;
limits of controlled airspace; VHF NAVAIDs with
frequency, identification, channel, geographic coor-
dinates; airports with terminal air/ground
communications; minimum en route and obstruction
clearance altitudes; airway distances; reporting
points; special use airspace; and military training
routes. Scales vary from 1 inch = 5nm to 1 inch =
20 nm. 50 x 20 inches folded to 5 x 10 inches. Charts
revised every 56 days.
Area charts
show congested
terminal areas at a large scale. They are included with
subscriptions to any conterminous U.S. Set Low (Full
set, East or West sets). (See FIG 9
−
1
−
5 and
FIG 9
−
1
−
6.)
9
−
1
−
4
Types of Charts Available