|Object Name:||Horizontal Situation Indicator|
|Year of Manufacture:||1973|
|Location:||Archive Object Store|
Horizontal Situation Indicator
Ser. No. AB278/73
Mod. 01 to 04, 06 to 10 & 12 to 13
The Jaguar Navigation and Weapon Aiming Sub-System NAVWASS comprised the MCS920M central digital computer, E3R inertial platform, Projected Map Display PMD and a Horizontal Situation Indicator together with the necessary power supply, electronic, interface and control units.
The Horizontal Situation Indicator is basically the situation indicator for the Smiths SFS.6 Flight System and combines a number of radio and navigational displays in a single 4-inch instrument:
● Glideslope deviation;
● Lateral deviation;
● Range readout;
● "To-From" indication;
● Track Required or TACAN bearing pointer and counter;
● Primary or magnetic heading;
● An index which can be positioned either automatically via the digital computer or manually. This index shows Actual Track or I.L.S. Capture.
Warning indications include:
● Failure flag brought up by power or system failure;
● TRUE/MAG: flag to indicate that the heading displayed is either True or Magnetic;
● LOC: flag to indicate an unacceptable localizer signal;
● CS: flag to indicate an unacceptable glidepath signal;
● "Ignore Range" bar shows when range being displayed is not relevant.
The unit is also marked: