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AIM

10/12/17

5−3−16

En Route Procedures

en route altitude (MEA) depicted in blue and

followed by the letter G at those lower altitudes. The

altitudes so depicted are below the minimum

reception altitude (MRA) of the land−based

navigation facility defining the route segment, and

guarantee standard en route obstacle clearance and

two−way communications. Air carrier operators

requiring operations specifications are authorized to

conduct operations on those routes in accordance

with FAA operations specifications.

2. The jet route system consists of jet routes

established from 18,000 feet MSL to FL 450

inclusive.

(a) These routes are depicted on Enroute

High Altitude Charts. Jet routes are depicted in black

on aeronautical charts and are identified by a “J” (Jet)

followed by the airway number (e.g., J12). Jet routes,

as VOR airways, are predicated solely on VOR or

VORTAC navigation facilities (except in Alaska).

NOTE−

Segments of jet routes in Alaska are based on L/MF

navigation aids and are charted in brown color instead of

black on en route charts.

(b) With respect to position reporting,

reporting points are designated for jet route systems.

Flights using jet routes will report over these points

unless otherwise advised by ATC.

3. Area Navigation (RNAV) Routes.

(a) Published RNAV routes, including

Q−Routes and T−Routes, can be flight planned for

use by aircraft with RNAV capability, subject to any

limitations or requirements noted on en route charts,

in applicable Advisory Circulars, or by NOTAM.

RNAV routes are depicted in blue on aeronautical

charts and are identified by the letter “Q” or “T”

followed by the airway number (for example, Q−13,

T−205). Published RNAV routes are RNAV−2 except

when specifically charted as RNAV−1. These routes

require system performance currently met by GPS,

GPS/WAAS, or DME/DME/IRU RNAV systems that

satisfy the criteria discussed in AC 90−100A, U.S.

Terminal and En Route Area Navigation (RNAV)

Operations.

(1) Q−routes are available for use by RNAV

equipped aircraft between 18,000 feet MSL and

FL 450 inclusive. Q−routes are depicted on Enroute

High Altitude Charts.

NOTE−

Aircraft in Alaska may only operate on GNSS Q-routes

with GPS (TSO-C129 (as revised) or TSO-C196 (as

revised)) equipment while the aircraft remains in Air

Traffic Control (ATC) radar surveillance or with

GPS/WAAS which does not require ATC radar surveil-

lance.

(2) T−routes are available for use by GPS or

GPS/WAAS equipped aircraft from 1,200 feet above

the surface (or in some instances higher) up to but not

including 18,000 feet MSL. T−routes are depicted on

Enroute Low Altitude Charts.

NOTE−

Aircraft in Alaska may only operate on GNSS T-routes

with GPS/WAAS (TSO-C145 (as revised) or TSO-C146 (as

revised)) equipment.

(b) Unpublished RNAV routes are direct

routes, based on area navigation capability, between

waypoints defined in terms of latitude/longitude

coordinates, degree−distance fixes, or offsets from

established routes/airways at a specified distance and

direction. Radar monitoring by ATC is required on all

unpublished RNAV routes, except for GNSS−

equipped aircraft cleared via filed published

waypoints recallable from the aircraft’s navigation

database.

(c) Magnetic Reference Bearing (MRB) is the

published bearing between two waypoints on an

RNAV/GPS/GNSS route. The MRB is calculated by

applying magnetic variation at the waypoint to the

calculated true course between two waypoints. The

MRB enhances situational awareness by indicating a

reference bearing (no−wind heading) that a pilot

should see on the compass/HSI/RMI, etc., when

turning prior to/over a waypoint en route to another

waypoint. Pilots should use this bearing as a reference

only, because their RNAV/GPS/GNSS navigation

system will fly the true course between the

waypoints.

b. Operation above FL 450 may be conducted on

a point-to-point basis. Navigational guidance is

provided on an area basis utilizing those facilities

depicted on the enroute high altitude charts.

3/15/07

7110.65R CHG 2

AIM

2/28/19