Components and Characteristics of the Instrument Landing System (ILS)
T-45A UJPT & E2-C2 INav-04
(2) The CDI is four times as sensitive when flying a localizer
vs. a VOR or TACAN approach
(a) Localizer beam is a total of 5 degrees wide
(b) The CDI scale now represents 2.5 degrees on each
side of center or 1.25 degrees for each dot
NOTE: As the aircraft continues inbound on course, both
the glideslope and course indicator will become
increasingly sensitive as the shielded navigational signals
become narrower.
c.
Marker Beacon Lights
Fig 7: Marker Beacon
Test and Illumination
(1) Located on the front instrument panel in both cockpits
Controls
(2) Lights flash blue, amber, and white as aircraft passes over
corresponding marker beacon transmitter
(3) VOR transmitter does not have to be selected ON (so don't
be surprised)
(4) Lights are considered advisory
(5) Light switch on INTERIOR/EXTERIOR LIGHTS PANEL
sets illumination intensity (dim to bright) - Also will change
the NAV/COMM Transfer Control illumination intensity
(6) Each marker beacon transmitter emits a unique modulated
frequency which is amplified by the marker beacon
receiver and then routed to pilot's headset as an aural
tone. Volume cannot not be adjusted
(7) Test the lights and tone circuits by placing the MASTER
TEST SWITCH to LAMP or TONE
Pilots should remember the following warnings
associated with the ILS approach system.
CAUTION: Vehicles and aircraft passing in close
Fig 8: ILS Critical Area
proximity to the LOC and GS antennas can cause
Taxiway Position
deviation in the projection of the localizer and
Markings
glideslope information. Should you observe sudden
or intermittent changes in course information
displayed on the ADI and HSI once established on the
FAC and not due to heading deviations, inform ATC
immediately and take appropriate action.
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(6-99) Original
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