Tax limit
The control limit (engl. Steering limit ) designated in the aviation the region in which the pilot to the flight path and can not continue to shift in the controlled steering direction also with other control inputs, as in the relevant instant, the control reserve has been used up in this control direction.
definition
“The tax limit describes a state in which a tax reserve is completely used up. When the control limit is reached, the aircraft will no longer comply with another control input in the corresponding direction, since either the maximum deflection of the respective control surface has been reached (physical control limit) or protective systems block the implementation in order to avoid entering a flight condition programmed as critical or to free the aircraft from such (flight dynamic control limit). "
meaning
When the control limit is reached, the pilot loses the possibility of shifting the flight path even further into the respective control dimension and control direction, as examples with regard to the two types of tax reserves show. Knowledge of the approach to a control limit is therefore of great importance for the situational awareness (Engl. Situation Awareness ) in manual flight.
species
Physical tax limit
A physical tax limit is reached when the maximum deflection of the respective control surface is reached. This maximum deflection can correspond to the mechanical maximum deflection as well as a maximum deflection reduced depending on the flight condition (in particular configuration, flight speed and air density) and flight phase. With conventionally controlled aircraft (as well as models that imitate conventional controls, such as the Boeing 777 ), this usually corresponds to the maximum deflection of the control instrument (e.g. control horn or control stick ). In the case of aircraft that are controlled by specifying roll rates ( Rate Command ), this does not necessarily have to be the case, especially not when an automatic support system (e.g. the yaw damper ) intervenes at the same time .
Flight dynamic tax limit
A flight dynamic control limit is reached when a further control surface deflection is still physically possible, but would lead the aircraft into a critical flight condition (in the case of a fly-by-wire aircraft, for example, protected by flight envelope protection ) and for this reason no control input - or only to a very limited extent.
See also
Individual evidence
- ↑ Florian JJ Schmidt-Skipiol Haptic feedback when operating fly-by-wire aircraft. Lower Saxony Research Center for Aviation, Braunschweig 2018, ISBN 978-3-947623-01-3 .
- ^ Cord-Christian Rossow, Klaus Wolf and Peter Horst Handbook of Aircraft Technology. Carl Hanser Verlag, Munich 2014, ISBN 978-3-446-42341-1 .