Sign in to follow this  
castarr

Altimeter "Dancing" up and down won't level

Recommended Posts

Folks, this may have been addressed moons ago but yet to find a remedy.

 

My pre-defined altitudes are plugged in and autopilot engaged; however, when the altitude is reached the Altimeter dances up and down and won't level

the aircraft to the pre-defined altitude entry. I usually click autopilot button a few times until the altimeter "calms down" and finally catches the altitude and levels but that is annoying.

 

I noticed on my Vistaliners 727's and DC-9's and some others but would like any input on what to adjust in Aircraft config or is it something else?..can't find a solution yet...

 

Your input always appreciated!

 

Respectfully,

Chris

Retro "junky" :-)

 

 

 

 

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

How high of a cruise altitude?  Pitot Heat on?  I thought I would start out with the easy things to check.

Share this post


Link to post
Share on other sites

Cruise altitude usually between 26k and 27k  Pitot Heat is off...

Thanks for replying..it's probably something staring me right in the face to adjust but can't put my finger on it....:-)

Share this post


Link to post
Share on other sites

Cruise altitude usually between 26k and 27k  Pitot Heat is off...

Thanks for replying..it's probably something staring me right in the face to adjust but can't put my finger on it....:-)

Wild guess here....I bet it's because your Pitot Heat is off!  Gets cold up there on occasion. :wink:

Share this post


Link to post
Share on other sites

Cruise altitude usually between 26k and 27k  Pitot Heat is off...

Thanks for replying..it's probably something staring me right in the face to adjust but can't put my finger on it....:-)

 

26/27k is round about where A/Ps are designed to change over to Mach for speed control instead of IAS. Assuming you have A/T engaged, could small computational errors in that be affecting the thrust slightly, thus causing the instability? See if it's okay much higher or much lower.

 

Pete

Share this post


Link to post
Share on other sites

Thanks gents...let me do a little checking with some of the tips you have shared....I will run a flight..as is..and then run same flight..with your suggestions.

I will report back. "gonna figure it out one way or another" 

 

Thank you buddy roos!

Chris

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this