Range (position) Systems

T-45C TS INav-02

Introduction to INav and Voice Procedures

CAUTION: Pilots should be aware that a

vehicular traffic not subject to ATC may

cause momentary deviation in ILS course

or glideslope signals. Also, critical areas

around the ILS equipment shielded

antennas are not protected at uncontrolled

airports or at airports with an operating

control tower when weather or visibility

conditions are above those requiring

protective measures.

Range (position) Systems 2.9.4.6.5.3

The following systems are commonly used to identify

range (position) when flying an ILS/LOC approach

Marker beacons

Distance Measuring Equipment (DME)

Cross Radial

Compass Locator

The position of the aircraft on ILS/LOC approaches is

very important due to the precise nature of the approach,

lower minimums, and obstacle clearances associated

with them. The pilot relies on this information to execute

specific portions of the approach and for position in

relation to the glidepath

Marker beacons

Sg 20, fr 23

Marker Beacons

Low power transmitters (75 watts)

Produces a signal in an elliptical pattern

Sg 20, fr 24

Marker Beacon Morse

(1) 1,000 ft above the antenna

and Color Codes

(2) 2,400 ft in width and 4,200 ft in length

Elliptical pattern (fan pattern) placement is

centered and perpendicular to the FAC

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(2-02) Original