Weapon Programming Unit

Technical Information

Catalogue No: C0254
Category: Stores/Weapon Management
Object Type: Control/Data Entry
Object Name: Weapon Programming Unit
Part No: 54-003-07
Serial No: 0227
Manufacturer: Marconi Avionics
Division: Instrument Systems [ISD]
Platform(s): Tornado 
Year of Manufacture:
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Location: Archive Object Store



The stores-management system (SMS) controls the selection, arming, and release of the Tornado’s bombs, rockets, guns and guided weapons and times the release in accordance with target data, wind, type of weapon, and other inputs.. Emergency and selective jettison facilities are also provided.

The system consists of four distinct unit types, which are interconnected by means of digital data transmission. As well as the two control panels, there is a master computer and stores loaded unit and numerous decoder units. These latter are responsible for digital data transmission interfaces, and for providing the power signals for stores release. In addition there are wing mounted Pilot Indicator Ordnance Release units.

The need for safety and mission success has been the prime consideration in formulating system philosophy, design and implementation.

The system is basically a duplicate, “both on line” arrangement and is highly self-monitored. A release is only permitted if both lanes agree, or if, on disagreement, the faulty lane is detected by its monitoring.

The master computer and stores loaded unit accommodates the following facilities:
● Weapon loaded facilities;
● Two optically-isolated 16 bit digital processor and stores;
● Interface electronics;
● Duplicate power supplies;
● System sub-fusing.

This has represented a major design constraint and, to satisfy it, extensive use of special hybrid components was necessary with multi-layer printed circuit cards loaded on both sides with components. CMOS technology is used to minimise the resulting heat dissipation problem, and sophisticated cold wall techniques combined with channelled air cooling are used.

The contract is work shared with Selenia.

This unit was designed to Spec No. SP-P-80012-OOP and the chassis is marked (in ink) "STI/T)R/256A".

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