|Category:||Head-Up Display [HUD]|
|Object Name:||HUD Optical Module's Standby Sight Injection Block|
|Year of Manufacture:||circa 1976|
|Location:||Rack RAA13 (HUD DU Parts) [Mezzanine Store]|
The lens system of the F-16 A/B Head Up Display is a standard Petzval design, but it includes a prism block used to inject a red Standby Sight. The Sight is depressible from a PDU Control Panel and has a Night Blind to reduce the intensity of the display at night. At this time, it was not possible to get a very low and stable luminance on the CRT; there was always the danger that it might disappear altogether, so the Night Blind allowed the tube to be run at a higher and stable luminance. The housing for the Standby Sight lamp gives a prominent finned bulge under the aft end of the PDU.