Contents
What are control laws in aircraft?
There are three primary flight control laws – Normal Law, Alternate Law and Direct Law. Alternate Law is further subdivided into Alternate Law 1 and Alternate Law 2.
What are the control laws?
Control laws are algorithms that determine the desired excitation based on the error signal.
What is LVL mode?
When the level mode button is activated in-flight, the autopilot automatically engages and works to return the aircraft to a straight-and-level condition.
What is a control law in control systems?
A control law is a mathematical formula used by the controller to determine the output u that is sent to the plant. A control law, which is usually part of the controller, takes the output of a process one wants to control as input.
What is direct law?
As an adjective, immediate; proximate; by the shortest course; without circuity; operating by an immediate connection or relation, instead of operating through an intermediary; the opposite of indirect.
When do flight controls degrade to alternate law?
An amber message USE MAN PITCH TRIM appears on the PFD. If the flight controls degrade to Alternate Law, Direct Law automatically becomes active when the landing gear is extended if no autopilots are engaged. If an autopilot is engaged, the airplane will remain in Alternate Law until the autopilot is disconnected.
How does the Airbus flight control system work?
With sidestick neutral and wings level, system maintains a 1 g load in pitch. No requirement to change pitch trim for changes in airspeed, configuration, or bank up to 33 degrees. At full aft/fwd sidestick deflection system maintains maximum load factor for flap position.
When does the ECAM message F / CTL altn show?
The ECAM message F/CTL ALTN LAW (PROT LOST) is displayed. In alternate law when the landing gear is extended the flight control system reconfigures to direct law.
What is the alternate law on an A320?
PITCH ALTERNATE – The pitch alternate law provides load factor demand mode, load factor limitation, high speed stability, low speed stability protections, and load alleviation function (on some A320s). ROLL DIRECT – Roll direct law is a direct side stick-to-aileron and spoiler position relationship.