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Jaguar Air Data Computer

Technical Information

Catalogue No: C1310
Category: Air Data
Object Type: Signal/Data Processor
Object Name: Jaguar Air Data Computer
Part No: 81-01-08
Serial No: X008/68
Manufacturer: Elliott Bros (London) Ltd
Division: Unknown
Platform(s): Jaguar
Year of Manufacture: 1968
Dimensions: Width (mm): 130
Height (mm): 197
Depth (mm): 380
Weight (g): 8,380
Location: Rack RAA10 [Main Store]

Air Data Computer
Type No. 81-01-08
Ref. No.
Ser. No. X008/68
[mods] A, B
[paper labels]
Production Aid only
Window requires sticking


From its configuration number (-08 against -21) it would suggest that this is an earlier model of the Air Data Computer. However it looks to be more like the newer generation units used on the other programmes mentioned.
The box has two inputs labelled ‘Pitot’ and ‘Static’ and has a complex test panel on the front with ten labelled lamps in an area with an ‘Encoder Test’ switch, three red lamps and a Self-Test button with an Elapsed Time Counter below that. Performance is continually monitored in flight and the pilot notified of any malfunction. On the ground, technicians can test the computer and height encoder in the aircraft simply by pressing the appropriate buttons and observing lights on the front of the box. Test sockets allow more detailed analysis of all outputs. The Serial No. is X008 showing that this is an experimental unit so the Test Panel may not have been on the production units.

An order for modular air data computers for British-built Jaguars, worth more than £250,000, was placed with Elliott Flight Automation by Mintech in1970. The unit was the smallest and lightest for its performance yet developed. A pre-production unit was flown in the S.06 prototype on its first flight in1969. The air data computer in the Jaguar forms a single central source of corrected signals of height, indicated airspeed, true airspeed, Mach number and related information, giving 16 different outputs for flight instruments, head-up display, navigation and weapon aiming. It also provides a digitised output of height for automatic altitude reporting through the secondary radar transponder. Individual functional modules can be replaced without recalibrating The mechanical transmission between modules also reduces weight and improves reliability.

The Air Data Computer was made lighter and smaller similar to the range of air data computers which were already being produced for the Nimrod, the American Lockheed C-5A heavy logistics transport, BAC One-Eleven, HS.748s for the Royal Australian Air Force and for the engine intake control system of the Concorde.

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