--> Europa-List message posted by: "Area-51" <goldsteinindustrial@gmail.com>
Thanks Bud, that pretty much sums aviation up in a nutshell. In a previous life
I once asked an old guy "which motorbike brand is the most reliable one", his
response was gold, "they are all only as reliable as the person working on
them"... A few days ago I was reading a question posted on a rotax forum, "who
has any experience with a rotax engine failure during flight"; I was shocked
and dismayed by the multitude of responses. But the plentiful failure
situations is not what shocked me. What shocked me was these story tellers
admitting that the engine failures were all direct a result of their own
failure to maintain the engine or land the aircraft when they "heard something
weird going on"... Bore scopes work great, on this occasion the bore scope was
not leaving me convinced with enough information...
Duncan's question... the 914 was a complete engine situation stored on a shelf
for 20years. The pitting on the exhaust valves was not a result of atmospheric
exposure and inconsistent with the rest of the unit's condition.. The 912ULS
had been removed from a very well maintained and cared for Tecnam, wrapped in
plastic and stored correctly in the factory crate with factory sealing plugs.
The wetness of oil residue within the combustion chambers was not a conducive
environment for rust to form and cause the degree of pitting found in the time
provided. To be honest I am not going to try and work out the why or how. I
will simply be removing heads at 1000hrs for vapour blasting and servicing as
part of my Line Maintenance schedule.
It's important to keep in mind these rotax units are designed to reach their
TBO at 80% power all the way while following the provided factory Line
Maintenance schedule. There is no shortcomings in the factory's strategy. The
engine will reach its TBO, its job is complete as advertised and the unit is
then required to be either "retired", or, "returned to an authorised rotax
service center for overhaul". Running the engine further "on condition" has
nothing to do with the factory and is all now upon the owner operator. Zero
timing a TBO'd unit requires replacement of the crankshaft assembly, along with
everything else the service centre is required to do...
Federal Mogal Valve Assessment pdf attached. An old one but a good one...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515230#515230
Attachments:
http://forums.matronics.com//files/federal_mogul_valve_information_card_111.pdf
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