OK, here is a possible method.  The Cozy MkIV has a side hinged canopy with a handle that engages latches to hold it closed.  Not enough if the latch is not engaged or fails.  For a safety stop there is a slightly curved flexible piece of slotted SS affixed to the interior fuselage and a protruding pin in the canopy frame.  When the canopy closes the pin first pushes (bends) the edge of the SS back until the pin enters the slot and the canopy continues until in the closed position.  If the canopy should rise up, the pin stops it at the top of the slot.  When opening the canopy, the pilot must pull a bit on the flexible SS to allow the pin to escape from the slot.  From the outside, the canopy is lifted enough so the pilot can reach inside and push on the SS to release the pin.  Simple and effective.

 

Grayhawk 

 

Fred,

I know of no canopy issues on the Legacy when locked prior to flight.  I have not heard or read of a latch failure on a Legacy.  That being said, if you lock the canopy it will stay shut.  Forgetting to lock two locks will result in the same error.

 Example of other systems on other airplanes that will kill you if you don't follow some form of checklist: Leaving the fuel selector in the off position prior to takeoff or not trimming the airplane prior to takeoff.  The very first airplane accident I ever witnessed was the former.  The club had a rule to turn off the fuel when finished.  This particular type would allow you to taxi all the way to the runway and get to about 100 feet before the engine would quit.  Secondly example, If you don't put the trim in the proper place on an Airbus it will not fly, we use "checklist, bells and whistles" to prevent an error here.  Bottom line, if your careless, it can kill you...  Use a checklist, dummy light, warning system of some sort.  You"ll live longer and be able to tell your stories over beers form many years.

Mike Larkin...

Sent from my iPad

On Nov 5, 2013, at 5:47 AM, Erik Larson <asw20747@aol.com> wrote:

Guys, I think as a community we are practicing denial.   There is a 500 pound gorilla standing in the corner of the room and everyone is ignoring him.  

Canopy problems are killing our friends.  The solution is not more bells, lights, switches and alarms, but a fail safe secondary sprin- loaded mechanical latch like the secondary hood latch on your car.  A modest team effort exchanging ideas and then teaming up to make some parts for retrofit would do the job. 

Hoping your canopy will stay shut is not a plan.  Since fatal results are frequently obtained, lights and switches are not enough.

  

Fred Moreno

I must say, I ABSOLUTELY agree with Fred on this.... something has got to be done about this Legacy Canopy issue and SOON!

At the very least, if Lancair is not going to address the issue directly with some kind of fail safe locking device, then they should, at the VERY least, amend the Legacy Operating Handbook, where it says, in so many words:  "If the canopy is left unlocked.... no problem.... just fly the airplane and everything will be OK..."  to something like:  "If you leave the canopy unlocked on the Legacy and get off the ground....there is a VERY good chance you will DIE or if you're lucky, just severely injured..."

I have followed these numerous canopy incidents/accidents and can NOT think of ONE, where it hasn't killed someone or if they are really lucky.... they come back with a harrowing tale of MAJOR controllability issues!  Apparently this is not the case with the 235, 320, or 360... but with the Legacy...it ALWAYS is!!!

As Fred said, Lights, Bells, Whistles, and Warnings are fine....but we need some sort of Fail Safe Latch or these tragic, needless accidents are going to keep happening.

Someone mentioned a "simple safety pin through the canopy frame and the roll over structure".... while that may work as a secondary latch, it still requires you to "do something" before takeoff for it to work.

A fail safe latch, by design, should allow you to taxi with the canopy cracked for ventilation but if the canopy is inadvertently left unlocked, to ultimately open NO more than a couple of inches.

Aren't others in the Legacy community concerned about this?  

I know Fred is....I know I am!!

Regards,

Erik Larson

Legacy N74FX

7years / 700 hrs in type

25,000+ hrs total time

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