Horizontal Situation Indicator

Technical Information

Catalogue No: C0588
Category: Navigation/Inertial
Object Type: Indicator/Instrument
Object Name: Horizontal Situation Indicator
Part No: SF/306/RNA/CPM/2
Serial No: AB278/73
Manufacturer: Smiths
Division: Unknown
Platform(s): Jaguar 
Year of Manufacture: 1973
Dimensions:
Width (mm):
106 
Height (mm):
106 
Depth (mm):
235 
Weight (g):
2,600 
Location: Archive Object Store
Inscription(s):

Horizontal Situation Indicator
Code SF/306/RNA/CPM/2
Ser. No. AB278/73
Supply 6JA/6605-99-111-8586.
Mod. 01 to 04, 06 to 10 & 12 to 13

Notes:

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:

Click to enlarge