Quantcast Range (position) Systems - P-12820118

 

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T-45C TS INav-04; ADV INav-02
Components and Characteristics of the Instrument Landing System (ILS)
II. Range (position) Systems 2.9.4.6.5.4
Sg 3, fr 2
ILS Range Information
The following systems are commonly used to identify range (position)
when flying an ILS/LOC approach
Sg 3, fr 3-5
*
Marker beacons
ILS Position Location
*
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
A. Marker beacons 2.9.4.6.5.3
Sg 3, fr 6-7
Fig 1: FAA Instrument
1. Low power transmitters (2 watts - 75 MHz)
Landing System (ILS)
2. Produces a signal in an elliptical pattern
a. 1,000 ft above the antenna
b. 2,400 ft in width and 4,200 ft in length
3. Elliptical pattern (fan pattern) placement is centered and
perpendicular to the FAC
4. Normally, two marker beacons are associated with an ILS
approach, Outer Marker (OM) and Middle Marker (MM). However,
Category II and III ILS approaches may also have an Inner Marker
(IM) associated with the approach
a. Outer Marker (OM)
(1) Indicates aircraft, if at appropriate altitude, will intercept the
glidepath
(2) Identified by a coded audio tone (three dashes) and
flashing blue cockpit marker light
b. Middle Marker (MM)
(1) Intersects the glidepath at approximately 200-ft AGL and
identifies the approximate missed approach point for
Category I approaches and Category “C” Navy aircraft
Page 4-9
(2-02) Original


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