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T-45C TS INav-04; ADV INav-02
Components and Characteristics of the Instrument Landing System (ILS)
(3) Situation steering arrow and course deviation dots only
appear when TACAN, Waypoint, or Waypoint Offset
steering is selected either separately or in conjunction with
ILS steering
(4) ILS deviation needles indicate aircraft position relative to
the localizer and glideslope in the same manner as the ILS
steering needles on the ADI
d. Instrument interpretation
(1) When ILS steering needles centered on ADI aircraft
symbol, the aircraft is on course and on glidepath
(2) When the CDI course line is centered on the HSI, the
aircraft is centered on the localizer course
(3) Deviation from glidepath are signaled on the ADI and HUD,
deviation from localizer approach course is signaled on the
ADI, HUD and HSI CDI course line (only ILS steering
selected)
(4) Correction to glidepath deviations are made by small power
and/or attitude adjustments
(5) Correction to localizer deviations are made by heading
changes of 5 degrees or less
(6) Glideslope and localizer deviation corrections become
smaller as the distance from the field decreases due to the
decreasing width of the glidepath and localizer signals
(7) The glideslope and localizer steering needles flash when
limited
(8) ILS course deviation on the HSI is relative to the localizer
beam width, if the localizer beam width is 5 degrees, each
dot on the HSI display represents 1.25 degrees of deviation
e. ILS advisories 1.8.1.9.11.3
Sg 5, fr 15
ILS Advisories
(1) GLIDESLOPE advisory window displayed and glideslope
steering needle removed from ADI and HUD when
glideslope signal not received
(a) Remove advisory window by pressing REJ push-button
(b) May continue with a localizer approach if glideslope lost
above MDA
(2) LOCALIZER advisory window displayed and all steering
needles, and HSI center CDI courseline removed when
localizer signal not received
Page 4-20
(2-02) Original


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