TDM Assembly

Technical Information

Catalogue No: C0231
Category: Mission Systems
Object Type: Data Storage
Object Name: TDM Assembly
Part No: 047-011--01
Serial No: 0051
Manufacturer: GEC-Marconi Avionics
Division: Unknown
Platform(s): Tornado 
Year of Manufacture:
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Archive Object Store

GEC-Marconi Avionics Ltd
TDM Assy. Part No. 047-011-01
Ser No. 0051 NSN Code K0656


Mission planning was carried out with the aid of paper maps but modern military aircraft have sophisticated navigation and attack systems and film or digital map displays. An aircraft’s mission is planned on the ground at a workstation and a data loading device, a non-volatile memory cartridge, is employed to download the mission information from the mission planning workstation and transfer it to the aircraft systems. Apart from the route and waypoints information on threats, Radio/Nav settings, Weapons settings, terrain and flight profile are just some of the information a pilot might need for a successful mission.
Although it cannot be verified at present it is likely that these units were made by Powerplant Systems Division.

This is the TDM (Transfer Data Cartridge?) onto which the mission planning data is loaded at the ground workstation. The cartridge plugs into the drawer in the Data Entry Unit (ODMI0230, ODMI0558). The data cartridge itself has to be rugged and reliable with a high data integrity and the ability to download fast. A typical cartridge has about 4Mbyte solid state non-volatile memory so that no battery backup is needed.
The 12 round glass-windowed photo-transistors, interspersed with photo-diodes form a 12-bit electro-optical data interface that is more rugged than normal mechanical electrical connectors. The Data Entry Unit will have a similar electro-optical array within it.

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