HOt EC120/Arrius - parallel post on Rotorheads

[3top]

Hi all,

I already posted this over on Rotorheads, but as it is maintenance, I will take a chance here too:

Let's see whether someone can help me out with a dilemma I am having with our EC120 - Arrius powered.

Since a short while I get a lot of temperature on the engine - T4.

Until recently the limitations where I fly (hot and humid) would come on as follows:
First Ng, second Torque, T4 would never get yellow as I would have to pull Ng past redline for that.
T4 goes yellow at 830ºC, normal max cruise would see never more than 780ºC.

Lately T4 is the primary limit, sometimes runnig out of yellow/red line befoe Ng gets close to yellow (at about 99.7 %).

So T4 runs anywhere from 35ºC at ground idle to 55ºC at max cruise OVER the regular temp at these levels.

The weird thing is, it does this at unregular intervalls.

I can tell right at start up when it will be running hot - ground idle would hover around 610ºC instead 565ºC.

Sometimes I would have 4-5 periods running hot, the same with normal temps.

It never changes once started up.
It seems like something gets stuck open or not. To much fuel I guess. My mechanic is already on the fritz with this.
Can't get an answer from Turbomeca without having their guys show up, which is a fortune!
So if anyone can give me a hint or had the same/similar experience, please shoot!
Otherwise we have no choice, but bite the lemon and get Turbomeca here.....

Thanks,

3top,

[fat&furious]

Have you washed the engine ever? Look down intake and if this is swirled with soot, salt or any other undesirables follow instructions below

Chem wash followed by;
Fresh water wash preferably with de-mineralised water.
Then after rinse, hang dry before use.

Do not use a fabric softener, no need to iron!

[3top]

Hi Fat,

thanks for the tip, especially the softener!

Well we wash the turbine a lot, that 's not the problem!

See post over at Rotorheads!


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