davidemox ha scritto:Eretiko ha scritto:Non ricordo bene ( devo leggere)
ma a quella quota il 320 è già in Direct Law quindi l'input non è filtrato dal computer
in avvicinamento l'airbus non va mai in direct law... ci va se hai un avaria.
in direct law (che poi non e' quella ma si chiama normal law ground mode) ce l'hai in decollo fino a 100 piedi o 5 sec.
Direttamente dai sacri testi:
NORMAL LAWS
In normal conditions, the normal laws are used to
compute the surface deflection orders.
Normal laws provide a FULL FLIGHT ENVELOPE PROTECTION.
There are three principal control modes:
- the ground mode,
- the flight mode,
- and the flare mode.
During the ground mode, a direct relationship exists
between the stick, elevators and roll control surfaces.
Also, the rudder is mechanically controlled by the
pedals and the yaw damper function is available.
The ground mode is activated after the flare mode when
the main landing gear shock absorbers are compressed
with pitch attitude confirmation.
In flight mode, the NORMAL LAWS are:
- Nz law for the pitch control, including load
factor protection,
- lateral normal law for the lateral
control(roll+yaw), including bank angle
protection,
- highspeed (VMO),
- pitch attitude (Theta),
- and stall (Angle Of Attack) protections.
The flight mode is activated after the ground mode
when the main landing gear shock absorbers are extended
with pitch attitude confirmation.
The NORMAL LAWS in flare mode are:
- flare law in place of Nz law for the pitch
control to allow conventional flare,
- lateral normal law,
- and stall protection.
The flare mode is activated after the flight mode below
a certain altitude.
DIRECT LAW
This law is automatically activated on ground.
The direct law can be activated in flight following
failures if the normal and the alternate laws can no
longer be performed.
A direct relationship between the side stick and the
surfaces is used.
In direct law, all the protections are lost.
Se non ricordo male la transizione a Flare mode avviene a 50' RA
Paolo