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conrad
Joined: 07 Feb 2007
Posts: 16
Location: Banbury. UK
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 Posted: Wed Feb 09, 2011 12:22 am Post subject: Engine Life - "On Condition" |
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I am compiling some information for a presentation at an LAA (Light Aircraft Association UK) meeting being held in a couple of weeks which may determine the future of running "On Condition" in the UK
If anyone has any examples of engines that have exceeded their TBO and are operating successfully (or not) I would like to hear from you so I can support the case for running past TBO. Any info you are willing to provide would be useful, but I will need engine type, model, original TBO limits, total hours to date & age of engine.
Can be any type of engine -Rotax, Jabiru, Lycoming, Continential, HKS, UL Power etc etc.
If you want to why not post the info below for all to see.
Engine type
Manufacturers TBO, Hrs/Years
Aircraft type
Fuel type used
Long periods of storage? (specify)
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Thu Feb 10, 2011 4:52 am Post subject: Re: Engine Life - "On Condition" |
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Conrad,
I have no statistics for you but except on type certificated aircraft or SLSA which REQUIRE replacement of some parts on a calender time basis, I use "on condition" replacement for most parts. The exception are those subject to high stress and high probability of fatigue failure over time or those parts which are difficult(expensive) to get to and I have current easy access to them.
A good example of this is a Jabiru 2200 solid lifter engine with a little over ten years in service. Last week we did a thorough engine inspection while it was off the airframe during and engine mount replacement due to damage in an accident. The rubber socket that connects the Bing 94 carb to the intake manifold is supposed to be replaced on a two year calendar basis, according to Jabiru. After ten years in service (but only about 200 hours) one end is beginning to show some minor cracks from aging. I ordered a new one. If it had been replaced every two years, it would not need replacement now, but the owners would have been out an extra $250 or so for unnecessarily replaced parts.
Successful on-condition replacement requires proper and timely inspections but it can save the owner significant amounts of money over the long term without sacrificing safety. In fact, it can sometimes improve safety for two reasons. One, a part already proven in service will not suffer what I call bad-new-part syndrome. Two, mechanics are not perfect and sometimes make mistakes when replacing parts. If proper inspection of a part can be done without disassembly then not replacing a good in-service part can reduce the risk of mechanic error.
I'm not preaching against replacement of parts on a calendar basis but tell customers that is is optional when it is legal to do so.
Thom Riddle
http://sites.google.com/site/riddletr/a&pmechanix
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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