T o d d P a t t i s t wrote:

Eric Greenwell wrote:


How does it tell the difference between takeoff - gear down,
spoilers open and landing - gear down, spoilers open?

It triggers the warning when the spoilers are unlocked and the airspeed
exceeds 25 knots. From the Cambridge manual:


I don't quite follow this. I land with an airspeed over 25
knots and I take off with an airspeed over 25 knots. That
would make it sound when landing with the gear down,
airspeed above 25 knots, and brakes open - i.e., the normal
approach. Does it watch to see if the airspeed was first
below 25 knots? Does it cut off when above 35 knots and
only sound during the takeoff roll?

The trigger isn't the airspeed value, but the rise in airspeed from
below 25 knot to above 25 knots. This happens only during the takeoff
roll. My apologies for not stating this clearly the first time. The
system does work well, and none of the pilots I know that are using it
get false alarms during flight or landing.


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Eric Greenwell
Washington State
USA