A320前轮转弯系统介绍及维护
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When the aircraft speed is above 130 knots, the steering is not available
（脚蹬操作时前轮转弯 角度与飞机速度的限制 关系）
A320前轮转弯系统介绍及维护
图示为增强型A320系列飞 机，区别在于选择活门位 置与classic 不同,液压使 用的是黄系统
➢ - or automatically through tห้องสมุดไป่ตู้e autopilot (yaw control).
In the event of simultaneous operation, the orders that the handwheels and pedals give are algebraically added.
➢ - at least one ENG MASTER switch is ON,
➢ - aircraft is on ground.
A320前轮转弯系统介绍及维护
➢ - the steering hand wheels (orders added algebraically),
➢ - the rudder pedals, ➢ - the autopilot.
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
SYSTEM OVERVIEW
A320前轮转弯系统介绍及维护
➢ - A/SKID & N/W STeeRinG switch is in ON position,
➢ - towing control lever is in normal position,
A320前轮转弯系统介绍及维护
传统型的6GC 将选择活门作 为部件嵌入到 整体中。液压 选用的是绿系 统。
A320前轮转弯系统介绍及维护
Servovalve
Selector valve Bleed screw Anti-shimmy accumulator
A320前轮转弯系统介绍及维护
➢ －An electrically-operated selector valve and its slaved valve. When the selector valve is energized, the pressure is applied to the servovalve.
速度高于70KTS，使 用手轮转弯无效
（手轮操作时前轮转弯角度与飞机速度的限制关系） （手轮偏转角度与前轮转弯角度比例关系）
A320前轮转弯系统介绍及维护
➢ During takeoff or landing, and more generally at high speed：
➢ - either through action of the Captain (or First Officer) on the rudder pedals,
➢ －A servovalve of the deflection-jet type, equipped with a LVDT sensor which detects the position of the slide valve.
➢ －An adjustable diaphragm located on each output line of the servovalve, this diaphragm is used to adjust the flow to each actuating cylinder chamber and consequently the wheel steering speed.
➢ In the event of simultaneous operation, the orders that the handwheels give are algebraically added.
➢ The maximum travel of the wheels is plus or minus 74 deg.
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
➢ During taxi, and more generally at low speed, through action on a handwheel. There are two identical handwheels: one for the Captain, one for the First Officer.
➢ The maximum corresponding travel of the handwheel is plus or minus 75 deg.
➢ The law between these two travels is not linear.
A320前轮转弯系统介绍及维护
20KTS以内，最大行程操作
➢ 因此，对于前轮转弯系统相关故障， 必须按手册谨慎处置。
Jetblue A320-232 (N536JB) 前起落架减震支柱上支撑防转凸耳损伤被剪切 断裂,导致前轮空中偏置90度，于Los Angeles airport (LAX)执行应急着陆。
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
PEDALS DISC按钮可在以下情 况脱开脚蹬对前轮转弯的控制： －During rudder ground check. －The runway is icy. Pilot can disconnect the control through the pedals from the steering control.
➢ －A by-pass valve which interconnects the two chambers of the steering cylinder in the event of hydraulic system depressurization.
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
➢ 飞机在地面滑行时的方向控制，几乎完全 依赖于前轮转弯系统NWS来操作完成。
➢ 如果前轮转弯系统出现故障，机组将无法 掌控飞机的滑跑方向，从而使飞机偏离或 冲出跑道、滑行道，轻则损伤飞机设备， 严重的甚至会造成人员的重大伤亡。
（脚蹬操作时前轮转弯 角度与飞机速度的限制 关系）
A320前轮转弯系统介绍及维护
图示为增强型A320系列飞 机，区别在于选择活门位 置与classic 不同,液压使 用的是黄系统
➢ - or automatically through tห้องสมุดไป่ตู้e autopilot (yaw control).
In the event of simultaneous operation, the orders that the handwheels and pedals give are algebraically added.
➢ - at least one ENG MASTER switch is ON,
➢ - aircraft is on ground.
A320前轮转弯系统介绍及维护
➢ - the steering hand wheels (orders added algebraically),
➢ - the rudder pedals, ➢ - the autopilot.
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
SYSTEM OVERVIEW
A320前轮转弯系统介绍及维护
➢ - A/SKID & N/W STeeRinG switch is in ON position,
➢ - towing control lever is in normal position,
A320前轮转弯系统介绍及维护
传统型的6GC 将选择活门作 为部件嵌入到 整体中。液压 选用的是绿系 统。
A320前轮转弯系统介绍及维护
Servovalve
Selector valve Bleed screw Anti-shimmy accumulator
A320前轮转弯系统介绍及维护
➢ －An electrically-operated selector valve and its slaved valve. When the selector valve is energized, the pressure is applied to the servovalve.
速度高于70KTS，使 用手轮转弯无效
（手轮操作时前轮转弯角度与飞机速度的限制关系） （手轮偏转角度与前轮转弯角度比例关系）
A320前轮转弯系统介绍及维护
➢ During takeoff or landing, and more generally at high speed：
➢ - either through action of the Captain (or First Officer) on the rudder pedals,
➢ －A servovalve of the deflection-jet type, equipped with a LVDT sensor which detects the position of the slide valve.
➢ －An adjustable diaphragm located on each output line of the servovalve, this diaphragm is used to adjust the flow to each actuating cylinder chamber and consequently the wheel steering speed.
➢ In the event of simultaneous operation, the orders that the handwheels give are algebraically added.
➢ The maximum travel of the wheels is plus or minus 74 deg.
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
➢ During taxi, and more generally at low speed, through action on a handwheel. There are two identical handwheels: one for the Captain, one for the First Officer.
➢ The maximum corresponding travel of the handwheel is plus or minus 75 deg.
➢ The law between these two travels is not linear.
A320前轮转弯系统介绍及维护
20KTS以内，最大行程操作
➢ 因此，对于前轮转弯系统相关故障， 必须按手册谨慎处置。
Jetblue A320-232 (N536JB) 前起落架减震支柱上支撑防转凸耳损伤被剪切 断裂,导致前轮空中偏置90度，于Los Angeles airport (LAX)执行应急着陆。
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
PEDALS DISC按钮可在以下情 况脱开脚蹬对前轮转弯的控制： －During rudder ground check. －The runway is icy. Pilot can disconnect the control through the pedals from the steering control.
➢ －A by-pass valve which interconnects the two chambers of the steering cylinder in the event of hydraulic system depressurization.
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
A320前轮转弯系统介绍及维护
➢ 飞机在地面滑行时的方向控制，几乎完全 依赖于前轮转弯系统NWS来操作完成。
➢ 如果前轮转弯系统出现故障，机组将无法 掌控飞机的滑跑方向，从而使飞机偏离或 冲出跑道、滑行道，轻则损伤飞机设备， 严重的甚至会造成人员的重大伤亡。