|Category:||Head-Up Display [HUD]|
|Object Name:||C-17 HUD circuit module|
|Division:||Airborne Display [ADD]|
|Year of Manufacture:||circa 1988|
|Location:||Rack RAA03 [Main Store]|
The C-17 HUD was ADD's first serious use of surface mount components and is also innovative in having two single-sided circuit boards bonded to an air-cooled core
This module is probably a special test card used in the early/pre stages of the C-17 HUD contract to gain confidence in the use of surface mount components and the CTE mismatch over the required temperature range. Note that most, if not all, of the integrated circuit devices have the word SNOOK inscribed.
This circuit module's function was to provide electrical continuity loops consisting of many pin/pad pairs connected in series as the loops passed through the “snooks”. The loops would be broken by a pin/pad failure caused by stress induced by thermal cycling.
The module was not made within ADD but was manufactured by a subcontractor on behalf of ADD although it may have been loaded with components in-house.