BMS F-16C/D 4.34, Flight Manual

Page: 83 / 234

T.O. BMS1F-16CM-1 BMS 4.34 Change 2.00
BMS 4.34 Dash 1
© Red Dog 2012-2019
Page: 83
1.4.3. HSD page
The Horizontal Situation Display p
age provides a god’s eye
view around your aircraft with information such as your radar
cone, concentric range circles, radar cursor position,
bullseye position (or bearing and range), INS flight plan with
steerpoints, lines, PPTs (Pre-Planned Threat points) and
their programmed range rings, IDM information and so on.
OSB #19 and #20 are used to change the HSD range. In the
image on the right only OSB #20 is available to increase the
range. Note the absence of a down arrow next to OSB #19
as the HSD is at its minimum decoupled range of 8 Nm.
The concentric ranges circles are dependent on the current
range but you will always have three of them in depressed
mode, with the last one being at the set range shown at the
upper left. The closest one is thus at 1/3 of that range and
the middle one at 2/3 of the range.
The inner HSD ring is divided by 4 cardinal marks. The small
flag indicates North. The longer line indicates South and the
two smaller lines point to East and West. These cardinal
directions are useful to determine your direction from the
HSD itself. They are also very helpful with bullseye situation
awareness. By joining the North and South pointer you draw
a reference line that can be used to quickly identify bearing
from the bullseye calls. In the right example, ownship
position is 158°from bullseye 16Nm and the radar cursor
position is 271°, 7Nm from Bullseye.
OSB #1 is labelled DEP (Depressed) and when pressed
toggles to CEN for Centred.
In DEP ownship is pictured below the centre of the MFD one
quarter of the way up from the bottom and visibility is better
in front of the aircraft than to the rear. When CEN is selected
ownship is placed in the middle of the display and the
visibility is equal to the front or behind own ship. Please note,
ranges are also different in DEP or CEN. The minimum range
for DEP is 8Nm, while you can go as low as 5 Nm in CEN.
CEN mode also matches the FCR ranges better.
OSB #2 is labelled DCPL (Decoupled) and when depressed
toggles to CPL (Coupled) which ties the HSD to the FCR
range. In CPL mode OSB #19 and #20 are inhibited (no
arrows displayed) and the HSD will change scale according
to the FCR scale (range).
To maintain a good correspondence between the HSD and
the FCR (which helps SA) it is advisable to work with the
HSD in CPL and CEN modes. This ensures that both ranges are the same and move together
according to the FCR range.