In the middle of 7 hour flight crzing at FL330 MD11 dropped unexpectedly to "protective thrust". Was able to correct by applying GA thrust

but would be interested in what may have caused the seemingly unprompted drop to protective thrust.

Thank you,

Ken Boardman

FSX Accel, Win 7-64

seemingly unprompted drop to protective thrust

 

A sudden change in winds perhaps? I'd recommend ActiveSky as the weather controller if you don't have that.

Thanks Kenny. I actually use A2012 and it was connected throughout the flight. There were several significant changes in wind speed and

direction so perhaps that was the cause; although I've done many other similar flights and not seen this.

Best regards,

Ken Boardman

Ken,

 

Unless you're using some sort of wind smoothing through Active Sky (DWC mode, or some other option), or through FSUIPC, wind changes at altitude happen from time to time and can cause issues for any plane.

Kyle: So it's normal then?

 

Regards

Morten

Guys, if you are using Active Sky 2012 or Evolution, you'll definitely want Direct Weather Control enabled. However, if you're using Active Sky Evolution, you'll probably want to start using FSUIPC options for wind smoothing.

Kyle: So it's normal then?

 

Unless you're running some type of smoothing, yes, unfortunately. It's a weather issue, not the plane.

but would be interested in what may have caused the seemingly unprompted drop to protective thrust.

 

Ken

 

I have the protective thrust mode activated frequently when flying the MD-11 using AS2012. This occurs over The North Sea on flights from Europe to the west coast of the United States. It occurs when the TAT suddenly sifts from a -8C to +47C and the EGTshoots thru the roof. So it's not only wind but temperatue also. HiFi has no clue as to a solution. The solution I use is to alternate fflights between Eurpoe-USA and Asia-USA. Not an elegant solution but it works.

 

Michael Cubine

TAT suddenly sifts from a -8C to +47C

HiFi has no clue as to a solution.

They should realize such a jump is impossible, so do something to either smooth it out, or reject it completely and use the last known good temp. They obviously *STILL* assume the data must be good (when we know it often isn't!!).

 

A little bit of data analysis goes a long way...

 

Best regards,

Robin.

Yeah, data validation would be nice...

Agree! Have experienced EGT spikes myself, which of course ruins my "level of immersion". But only for a sec or two. ^_^