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T-45C TS INav-04; ADV INav-02
Components and Characteristics of the Instrument Landing System (ILS)
(2) indicates a position approximately 3,500 ft from the landing
threshold and approximately 200 ft AGL above the
touchdown zone
(3) Identification is a coded audio tone (dot dash dot dash) and
flashing amber cockpit marker light
c.
Inner Marker (IM)
(1) Indicates a point that an aircraft flying a Category II or III
ILS approach is at the designated decision height (DH) on
glidepath between the MM and the touchdown zone
(2) Aircraft is approximately 100 ft AGL at IM if on glidepath
and FAC
(3) Identified by a coded audio tone (four dots) and a flashing
white cockpit marker beacon light
d. Back Course (BC)
Sg 3, fr 8
Back Course LOC (FAF)
(1) A BC marker beacon normally indicates a LOC BC final
approach fix (FAF) where the approach glideslope is
intercepted and the descent is commenced
(2) Identified by a coded audio tone (two dots) and a flashing
white cockpit marker light
5. Marker beacon tones
Sg 3, fr 9
a. Marker beacons emit specific coded tones, at different pitches,
Fig 3: Marker Beacon
which the pilot of an ILS/LOC equipped aircraft can monitor
Code/Color Identification
when on the final approach course
Table
b. In the T-45C, marker beacon tones may be monitored by
placing the “MKR” switch on the communications control panel
to the “ON” position
c.
MKR audio tone volume in the T-45C is preset and cannot be
controlled by the RCVR volume control knob on the
communication control panel
B. Distance measuring equipment (DME)
Sg 3, fr 15
1. When DME is specified in the approach procedure, DME may be
DME
used:
a. In lieu of the OM
b. As a BC final approach fix (FAF)
c.
To establish other fixes on the localizer course
Page 4-10
(2-02) Original


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