Flying Instructors & Examiners A place for instructors to communicate with one another because some of them get a bit tired of the attitude that instructing is the lowest form of aviation, as seems to prevail on some of the other forums!

engine life

Old 5th Apr 2019, 16:48
  #1 (permalink)  
Thread Starter
Join Date: Jan 2010
Location: UK
Posts: 239
engine life

can someone please tell me the limitations for a flying school ( UK) aircraft please, is it 2200 then 10%, then must it be replaced with a new unit?
many thanks in advance
memories of px is offline  
Old 6th Apr 2019, 10:10
  #2 (permalink)  
Join Date: Oct 2017
Location: Bressuire
Posts: 83
There isn't a fixed figure. Each engine type has its own TBO (to be overhauled). This may be different even for the same engine: if it is turbo charged, approved for aerobatics etc. Where an engine has an approved extension programme this figure is commonly 20%. In the case of a 2000 TBO engine it may therefore be extended "on condition" for a further 400 hours. If the engine is used wholly for private use the on condition programme can be without limitation of extensions.
Fl1ingfrog is offline  
Old 6th Apr 2019, 16:34
  #3 (permalink)  
Join Date: Jan 2008
Location: Uxbridge
Posts: 568
Actually it's time before overhaul.
MrAverage is offline  
Old 6th Apr 2019, 18:35
  #4 (permalink)  
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 15,765
Remember the life is not just on hours, it is also on calendar,

As an example here is the Lycoming current engine life recommendations, some engines such as the 0-360 if used frequently as laid down get a greater number of hours over their normal TBO, see

The Uk then allows a variation to these hours and calendar as mentioned ( an extension of 20%) depending on certain criteria being met CAP 747 GR 24 refers, see page 346

private as said are on condition.

Last edited by NutLoose; 6th Apr 2019 at 19:01.
NutLoose is offline  
Old 6th Apr 2019, 19:45
  #5 (permalink)  
Join Date: Mar 2016
Location: Cotswolds
Posts: 97
I've always read it as Time Between Overhaul
Kemble Pitts is offline  
Old 6th Apr 2019, 21:29
  #6 (permalink)  
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 15,765
Which is exactly what Lycoming use to describe it,see my first link above.

When the factory overhauls an engine it comes back with the total hours on the log book cert, so if it has been overhauled say twice and the engine has a TBO of 2000 the log book cert may have the engine hours listed since new, say 4,000 hrs, but will have been overhauled and will have 2000 hours to run, hence it is time between overhaul to the next one, if it was "before" then technically it would already be expired on hours in the legal sense under that description?

They do three types of engine, New, rebuilt overhauled to new dimensions and zero timed, and overhauled to overhaul specs that is a continuation of hours. ONLY the factories can zero time their engines.

Last edited by NutLoose; 6th Apr 2019 at 21:43.
NutLoose is offline  
Old 7th Apr 2019, 08:14
  #7 (permalink)  
Join Date: Jan 2008
Location: Uxbridge
Posts: 568
I sit down corrected and I apologise.
MrAverage is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.