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Colyn,
I have had this happen from induction coupling failures on about half a dozen occasions over the last 12 years.
Keep in mind, this includes a LOT of return to service flights, where a mechanic has failed to get an induction coupling tight enough. (I was the mechanic with the limp wrist on the clamp, once!)
One time I was at about 14 to 15,000 feet leaving Ada for Colorado.
The MP dropped to about ambient less an inch or so. I landed at a small airport on a Sunday afternoon and re-positioned the induction coupling on the ramp and tightened it down and then continued the flight.
If it is JUST an induction coupling, it is really no big deal. But you never know. My brother had one of these "unexplained loss of MP" events in our C-320 in about 1981 or so. Left engine caught fire and he bellied the airplane into a corn field. Wife and two kids on board. Good outcome. Engine fell off the left wing when they jacked the airframe up!!!
Any time the induction couplings are disconnected, it is really a good idea to make a return to service flight to 18,000 feet or so, and then re-tighten the couplings back on the ground before leaving home in anger.
Regards, George
-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of colyncase on earthlink
Sent: Saturday, July 09, 2005 4:33 PM
To: Lancair Mailing List
Subject: [LML] Re: Turbo Loss Consequences
George et al,
I don't think anyone has said yet what you actually end up with for
available MP
in the case of a hard turbo failure.
e.g. let's take the classic turbine wheel jams scenario, causing a pretty
good blockage
on that compressor. You're now feeding the whole engine from the other
turbo. Am I right
that you are now at NA power levels or less before you execute your safety
procedures?
Colyn
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