The glideslope transmitter operates on one of 40 dedicated ILS channels

T-45C TS INav-04; ADV INav-02

Components and Characteristics of the Instrument Landing System (ILS)

NOTE: Glidepaths with no published DH are usable to runway

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threshold. Pilots of T-45C aircraft will execute a missed

Runway Threshold/DH

approach at the MM or 200 ft AGL whichever occurs first.

NOTE: ILS installations that share the same frequency can

exist at each end of a given runway or at other runways on an

airport but cannot be in operation at the same time. However,

fields can have ILS approaches to different runways that do not

share the same frequency and can operate simultaneously.

e. The glideslope transmitter operates on one of 40 dedicated ILS

channels

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Glideslope Transmitter

Frequencies

(1) Generates within the UHF frequency range of 329.15 and

335.00 MHz

(2) Dedicated glideslope UHF frequencies are paired with

dedicated localizer VHF frequencies and are automatically

tuned upon selection of a localizer frequency

CAUTION: Pilots should be aware that false glideslope

signals may exist. This can cause the glideslope advisory

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window to disappear and glideslope and localizer needles

False Glideslope Signals

and Deviations

to appear. Always disregard any glideslope indication when

the aircraft is not on a published portion of an ILS approach

at a published approach altitude where the glideslope

interception is indicated and anticipated.

CAUTION: Pilots should be aware that 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.

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(2-02) Original