Vacuum sys. driven instruments on helicopters?
I am browsing thru some training material about helicopter systems - and I came across one that says there is no helicopter with vacuum system installed (used to drive gyro instruments)
I believe there is none installed on a turbine helicopter, but piston engine ones? Anyone who can help me out with an example of standard fit vacuum system on a (piston engine) helicopter, that is currently in use in FAA/EASA world? THX hoistop |
Originally Posted by hoistop
(Post 11032311)
I am browsing thru some training material about helicopter systems - and I came across one that says there is no helicopter with vacuum system installed (used to drive gyro instruments)
I believe there is none installed on a turbine helicopter, but piston engine ones? Anyone who can help me out with an example of standard fit vacuum system on a (piston engine) helicopter, that is currently in use in FAA/EASA world? THX hoistop |
It would have to be a very old helicopter to have vacuum gyros - I haven't seen one in a military helicopter in 40 years.
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Vacuum Gyroscopic Instruments
Originally Posted by [email protected]
(Post 11032390)
It would have to be a very old helicopter to have vacuum gyros - I haven't seen one in a military helicopter in 40 years.
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Originally Posted by hoistop
(Post 11032311)
I believe there is none installed on a turbine helicopter, but piston engine ones?
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I've started my flying career on Alouette III (SudAviation/Aerospatiale). It was a machine from late 60's. That version had engine vacuum instruments from what I remember, playing stabilization gyros - heading and attitude indicator.
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The Bristol Sycamore had vacuum instruments. I can remember flying them fifty-six years ago and having to ignore the artificial horizon when transiting because of the acceleration errors. There was no way you could topple them: You were confirmed to be, or soon to be, dead if that happened.
You can see from this picture the characteristic slant of an artificial horizon with a lack of vacuum. Edited to add. This picture appears to have an electrical T&S but I cannot remember what a vacuum T&S had on its face. BRISTOL Sycamore Walkaround https://cimg9.ibsrv.net/gimg/pprune....f58d7a152.jpeg |
Have there ever been turn-and-slip indicators that were *not* electric? Every one I've ever seen was electric.
WRENCH1 is right. Well into the 1990's, I flew for that GOM operator (PHI) that had vacuum artificial horizons and directional gyros in their 206B's. My knee-jerk first reaction was that it was a really bad idea and couldn't understand why they did that. Then, about that time, I looked at the cost of replacing the vacuum instruments in my Cessna 150 with electric ones. Holy cow! I just stayed with the old vacuum gauges. And PHI had, what, a couple of hundred 206B's at one time...206B's that *NEVER* flew IFR? Yeah, I'd put vacuum gauges in them too if I were the DOM. In fact, I still would. |
Originally Posted by attitudepowertrim
(Post 11032461)
I've started my flying career on Alouette III (SudAviation/Aerospatiale). It was a machine from late 60's. That version had engine vacuum instruments from what I remember, playing stabilization gyros - heading and attitude indicator.
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The `Skeeter` had an AH and DG driven by an engine-driven vacuum pump.....with an electric T & S.....
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And these days you can get a full 2-screen glass set-up for the cost of an overhaul of your electric AI.
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Originally Posted by attitudepowertrim
(Post 11032461)
I've started my flying career on Alouette III (SudAviation/Aerospatiale). It was a machine from late 60's. That version had engine vacuum instruments from what I remember, playing stabilization gyros - heading and attitude indicator.
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