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A-7 TRAM HUD Electronics Unit

Technical Information

Catalogue No: C0041
Category: Head-Up Display [HUD]
Object Type: Signal/Data Processor
Object Name: A-7 TRAM HUD Electronics Unit
Part No: 59-034-01
Serial No: JDR 0010
Manufacturer: Marconi-Elliott Avionic Systems Ltd
Division: Airborne Display [ADD]
Platform(s): A-7 Corsair
Year of Manufacture: circa 1976
Dimensions: Width (mm): 190
Height (mm): 190
Depth (mm): 455
Weight (g): 11,540
Location: Rack RAA05 [Main Store]

Contract N00019-76-C-0498
Dsgn. Act. 27489
PN 59-034-01
Mfr. 27489
Ser. No. JDR 0010


The world’s first raster HUD system was developed by Marconi-Elliott Avionics in 1973 for the A-7 Corsair. The system was called TRAM (Target Recognition Attack Multisensor) and electronically combined the display of a low light level or infra-red sensor in the HUD system with the HUD symbols such that the pilot was given night vision. Another application was to display a radar display.

Symbology was added to the raster by means of a complex dual vidicon scan converter CRT which required a large number of preset adjustments. The HUD operated in a normal high brightness symbology mode in daylight with a raster display at night thus providing a 24 hour capability. The FLIR in the A-7 system had a zoom capability of about 11:1 and was used in identification of target ships from medium altitude. Around 65 of these TRAM systems were made and they saw service in Vietnam.

This unit is the video mixer computer in which the symbology and FLIR images are combined.

Click to enlarge
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