曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
o An audio stall warning consisting of "crickets" and a "STALL" aural message is activated.
o The Alpha Floor function is inoperative.
• The PFD airspeed scale is modified:
o VLS remains displayed
o VALPHA PROT and VALPHA MAX are removed
o They are replaced by a red and black barber pole, the top indicating the stall warning
speed VSW
• A nose up command is introduced any time the airplane exceeds VMO/MMO to keep the speed from
increasing further, which CAN be overridden by the sidestick.
• Bank angle protection is lost.
• Certain failures cause the system to revert to Alternate Law without speed stability.
• Yaw damping is lost if the fault is a triple ADR failure.
ABNORMAL ALTERNATE LAW
Abnormal Alternate Law is activated if the airplane enters an unusual attitude, allowing recovery from the
unusual attitude.
• Pitch law becomes Alternate (without autotrim or protection other than Load Factor protection).
• Roll law becomes Direct law with mechanical yaw control.
• After recovery from the unusual attitude, the following laws are active for the remainder of the flight:
o Pitch: Alternate law without protections and with autotrim.
o Roll: Direct law
o Yaw: Alternate law
• There is no reversion to Direct law when the landing gear is extended.
DIRECT LAW
Direct law is the lowest level of computer flight control and occurs with certain multiple failures.
• Pilot control inputs are transmitted unmodified to the control surfaces, providing a direct relationship between
sidestick and control surface.
• Control sensitivity depends on airspeed and NO autotrimming is available.
• 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.
• There are no protections provided in Direct Law, however overspeed and stall aural warnings are provided.
• The PFD airspeed scale remains the same as in Alternate Law.
MECHANICAL BACKUP
In case of a complete loss of electrical flight control signals, the aircraft can be temporarily controlled by
mechanical mode.
• Pitch control is achieved through the horizontal stabilizer by using the manual trim wheel.
• Lateral control is accomplished using the rudder pedals.
• Both controls require hydraulic power.
• A red MAN PITCH TRIM ONLY warning appears on the PFD.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：
AIRBUS FLIGHT CONTROL LAWS(2)
