|Category:||Head-Up Display [HUD]|
|Object Type:||Display Unit|
|Object Name:||F-16A/B HUD Pilot's Display Unit|
|Platform(s):||F-16A/B Fighting Falcon|
|Year of Manufacture:||circa 1977|
P.D.U. HUD Set
Dsgn. Act. 27489
Ser. No. 27489C0447
The PDU has four functional groups, the cathode ray tube assembly (CRT), the optical module, the chassis and the control panel. The CRT assembly comprises the tube itself, the deflection coils and a matching circuit to compensate for minor variations in individual CRT’s. The CRT was made by Rank Brimar and it was this system that initially used the Muirhead deflection coils.
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 windblast if the canopy is lost and birdstrike.
This unit has a Rochester Serial Number 447 and being a fairly high number was probably built around 1977. The HUD was installed on a special version of the F-16A/B fitted with the General Electric J79 engine.