Instrument interpretation

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

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(2-02) Original