Jellycopter,
we hardly ever use P2. Too hot down here for that! But anyway I even tried it out in flight: T4 will hardly move in cruise -maybe some +5-10°C (if running hot or not doesn't matter, it will move about the same amount in either case). It will go down again when shut off, besides you really cannot miss the P2 indication on the screen.
Mr. Selfish,
I also believe if a thermo couple is out (or all of them) there shold be some indication about this or no T4 at all.
What you mean is the "Powercheck" and you get to it by scrolling down the screen:
first press, you change from FLI to 3 individual gauges
second press, you get the "Powercheck"
third press, you get the Weight&Balance screen
fourth press, back to FLI.
The Powercheck will indicate exactly what T4 does:
When T4 is normal I get a "good margin" (indicted by some negative T4 value)
If hot I get a "bad margin" (indicated, in my case, with some +35°C Margin)
Besides the software for thePowercheck is not that great yet.
We still get "bad torque margins", that's why Turbomeca came out with a correction table (paper
) for the torque values....
However the T4 marging is a good indicator.
You know, if the engine would go sour one could follow up, as this normally happens gradually (" I used to be able to get out of here with 4 people instead of 2, before hitting redline, etc."
My case is different:
If I start with T4 normal, I have all the power there is (not enough, by the way!! EC are you listening!!), and T4 never even gets close to yellow before I hit redline with Ng.
If T4 starts hot, I hardly ever get yellow on Ng before going red with T4!
Yesterday I had 2 flights normal and T4 at max cruise would read from 750°C to 775°C. Next 3 flights were hot with T4 at 825°C with torque around 76% and Ng around 98.2%!! (850° for take off!)
I really wonder!
Supposedly a Turbomeca certified mechanic is to show up today. I hope he finds the bug!
Nevertheless, PLEASE keep suggestions coming, anyone knows any good freelance mechanics (Arrius engine, turbomeca certified)?
3top
