Bruce,
Are you referring to a Standard Cirrus or the Open version ? If it is
a Standard, the force to open the airbrakes from locked position
should be set at about 20 Kg (44 lb force). With this unlock
requirement, I don't think just rubbing your arm along the lever would
unlock the brakes.
Cheers, John G. (Std Cirrus #672)

"Bruce Greeff" wrote in message
...
I'm so tight in my Cirrus I can inadvertently open the airbrakes by
moving my
left arm back.

There is enough friction between my arm and the actuator to overcome
the
geometric lock.

Quite exciting when you do that on your first single seater launch
in a Cirrus
on a winch...

Uri Saovray wrote:
Sure, but that doesn't take care of INADVERTENT opening of the
spoilers. Examples: weak geometric lock + some turbulence;
Dual-command + some confusion in the other seat; You can probably
think of more examples...
Uri

Pete Zeugma wrote in
message ...

At 22:18 14 March 2004, Uri Saovray wrote:

Speaking of simple warning devices:
How about a simple hookup to a horn which is activated
when the
airbrakes are opened while the towhook is engaged (i.e.
open spoilers
during tow)?
A microswitch on the airbrake levers would be the no-brainer
part.
What about the towhook? Magnetic sensor? where? How?




Other ideas?


how about the last 'B' in CB-SIFT-CB i've always found
it to be a no-brainer personally, and its completely
free! Usually accompanied by the guy who attaches the
towrope/cable saying that phrase 'brakes closed and
locked?'