BMS F-16C/D 4.34 Flight Manual page 146

T.O. BMS1F-16CM-1 BMS 4.34 Change 2.00
When the INSTR MODE selector is positioned to ILS/NAV, ILS cues are displayed on the HUD/ADI
and selected STPT distance and bearing information is shown on the HSI. The HSI CDI does show
ILS localizer deviation.
When the INSTR MODE selector is positioned to ILS/TCN, ILS cues are displayed on the HUD/ADI
and TACAN distance and bearing information are shown on the HSI. The CDI always shows localizer
deviation.
Noting the above difference you will realise that the DME never actually refers to the ILS. It refers to
the selected steerpoint or the selected TACAN, neither of which may be at the same location as the
ILS antenna. ILS approaches in BMS are therefore all ILS DME approaches.
It is important to note that ILS localizer raw data is displayed on the HUD the ADI and on the HSI, but
the glideslope is displayed only on the HUD and the ADI. Command steering cueing (when selected)
is only displayed on the HUD. The command steering cue is a circle similar to the great circle steering
cue (tadpole), but it has no tail. When the glideslope is intercepted, a short tail appears on the
command steering cue and the cue moves up and down to indicate corrections required to intercept
and maintain the glideslope. The pilot flies the FPM to the command steering cue to intercept and
maintain the localizer course and the glideslope for an ILS approach.
BMS 4.34 Dash 1
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