|Category:||Head-Up Display [HUD]|
|Object Name:||F-16A/B HUD Optical Module|
|Part No:||27489 SOCN229-009904|
|Platform(s):||F-16A/B Fighting Falcon|
|Year of Manufacture:||Unknown|
|Location:||Main Object Store|
PPE Serial No. K6111C 0319
Part No. 27489 SOCN229-009904
Mfr. Code K6111
Mfr. Part No. 020420
Contract No. F333657-75-C-0310
Clean glass with FED SPEC O-E-760 alcohol & lens tissue
This Optical Module is easily identified as F-16 A/B by the two control knobs on its aft end; one is for the Standby Sight and the other controls the luminance. The wedge projecting aft is for a film camera - now a solid state video recording camera. The Total Field of View of the F-16 A/B PDU is 20deg but the Instantaneous FoV is only 9deg in elevation and 13.38deg in azimuth because the combiner to eye distance is quite large due to the highly angled seat. The whole optical system has to correct for display distortions and try to correct for canopy distortions. The F-16 bubble canopy is particularly difficult and every canopy is different needing unique correction. The lens system 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.
The PDU has a very rigid Combiner frame to withstand birdstrike on the F 16 where the canopy can deform onto the HUD and it is even possible for a bird to penetrate the canopy. These PDU’s are unique in being designed and tested to withstand both birdstrike and windblast (if the canopy is lost).