Jump to content
Aero Precision provides OEM part support for military aircraft operators across more than 20 aircraft
Sign in to follow this  
Badiul Alam

Travel of RPM and Frq with throttle movement.T56 Eng.

Recommended Posts

Hey Herk friend. One of my Eng/ prop rpm increases upto 105% during opening pwr with freq and then comes to 100% after 6-7 sec with freq 400 Hz. When rpm increases to 105%, then TIT remain 750-800(-7B). After reaching 100% rpm,  TIT starts rising. Again while retarding throotles back to Flt Idle, rpm comes to 95-94%( on grd) and 96-97% in flt, then increases slowly with freq. That is in Normal, mechgov and synchro mode. We have replaced VH, FCU, TD Valve,TD amp but no joy. Any suggestions pl.    

Share this post


Link to post
Share on other sites

bad valve housing, or internal leak from dome seals, pitchlock regulator, or

prop retaining nut seals

Share this post


Link to post
Share on other sites

Only thing I would add to pjvr99's response is consider resealing the low pitch stop too. I'd almost bet money the squeal check would fail.

Share this post


Link to post
Share on other sites
23 hours ago, Lkuest said:

Only thing I would add to pjvr99's response is consider resealing the low pitch stop too. I'd almost bet money the squeal check would fail.

yes, forgot about lps

Share this post


Link to post
Share on other sites
On 6/20/2020 at 9:09 AM, pjvr99 said:

bad valve housing, or internal leak from dome seals, pitchlock regulator, or

prop retaining nut seals

Thanks. We have replaced VH and now all SAT.

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...