Question - What is it? (next to HUD)

[AeriaGloria]

55 minutes ago, Drona said:

Any idea what the highlighted portion is?

And part of pressurization system no doubt 

[Fighter29]

4 часа назад, AeriaGloria сказал:

And part of pressurization system no doubt 

Hot air tube for windshield ventilation 

[PhantomHans]

On 8/30/2025 at 1:47 PM, YoYo said:

This system was part of the ZSh-5 – the world's first integrated helmet-mounted sighting system (HMS), introduced in the MiG-29 and Su-27 in the late 1970s/early 1980s.

https://airandspace.si.edu/collection-objects/helmet-flying-protective-type-hgu-30p-or-vtas-i-united-states-navy/nasm_A19800073000

Well, maybe a world second.  VTAS on the F-4J/N/S Phantoms came in September 1972 offering the same missile and radar (starting with VTAS II in 1975) slaving capability.

Edited 3 hours ago by PhantomHans
Weird multiple post