I actually have a direct email address and its not hard to guess.
You have this precisely backwards.
*ROTAX* have a 12 year / 1200 hour TBO on 914 engines (10 years / 1000
hours on older ones until some minor works are performed). Stemme do
not.
*STEMME* use that engine (with some modifications that turn it into a
Rotax 914F2/S1 - mostly moving the Turbocharger position).
It turns out that the time based TBO limit is a non issue in Australia
(and indeed globally) in the Stemme installation for two reasons:
a) The CASA general engine AD that allows all piston aircraft in
Australia to be operated beyond their TBO on an 'on condition' basis
(providing they are not used for commercial purposes) applies to this
aircraft (and I have specifically reconfirmed that with the GFA many
moons ago). So providing the engine is operating without eating oil
and with good compressions, you can keep running it until it isn't, and
b) Just before xmas last year, Stemme were able to modify the
certification of the aircraft (as they modify the engine, they are
actually the certification provider for that installation, not Rotax,
though they otherwise do follow Rotax bulletins). The change in
certification was to alter just one word regarding the TBO, which is
to define the Rotax limits as 'Recommended' instead of mandatory.
So, (b) generates the same outcome as (a), but globally.
And none of this is a 'rumour' in any sense. You can read the CASA
engine amendment on the CASA site, and you can read the engine and
maint manual set for the Stemme here (including the Rotax engine
manual that is used by Stemme).
http://www.stemme.com.au/manuals
Why did you ask?
Regards,
Simon
p.s. do feel free to reply just to me directly.
On 27/01/2009, at 2:51 PM, Mark Fisher wrote:
I am hoping Simon Hackett reads this. I have heard rumours that
Stemme have had the 12 year time life on Rotax 914’s lifted or
extended by Rotax .
Can anyone shine any light on this subject?
Cheers
Mark
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