微软模拟飞行2020波音747-8自动驾驶使用指南

VNAV PATH

In the cruise phase the target altitude is the cruise altitude and after the top of descent the target altitude decreases towards the destination airport. VNAV PATH pitches up and down to stay at a this computed target altitude, typically with little or even idle thrust.

To arm the VNAV PATH descent when you are at cruise altitude:

Click the VNAV button. This will directly engage VNAV since the vertical profile is already hit

When you are in ALT, V/S or FLCH and are below the vertical profile and want to intercept it

Select a lower altitude

Press the VNAV button. This will arm VNAV in white on the flight mode annunciator. If you were in ALT before VNAV ALT will engage and the altitude will be maintained until you intercept the profile. If you were in FLCH you may want to consider switching to V/S and lower the descent rate to be able to intercept the profile. When you are in V/S the selected vertical speed is maintain until you intercept the profile.

When you are above the vertical profile and want to intercept it from above the profile

Decrease the selected altitude

Click the VNAV button to directly engage VNAV SPD for the descent

Extend speed brakes to increase the descent rate or to a speed intervention as described below

在巡航阶段，目标高度是巡航高度，在下降高度TOD之后，目标高度朝着目的地机场减小。VNAV PATH上下倾斜以保持在此计算出的目标高度，通常只有很少甚至是空转怠速推力。

在巡航高度 时要武装VNAV PATH下降：

单击VNAV按钮

单击VNAV按钮。由于已经击中了垂直计划，因此将直接启动VNAV

当您处于ALT，V / S或FLCH且位于垂直计划下方并且想要拦截它时

选择底高度，按下VNAV按钮

选择较低的高度

按下VNAV按钮。武装后的VNAV将在飞行模式信号器上以白色现实。如果您在VNAV之前处于ALT状态，则ALT会起作用，并且高度会保持不变，直到您拦截轮廓为止。如果您使用的是FLCH，则可能要考虑切换到V / S并降低下降率，以便能够截取轮廓。在V / S中时，所选的垂直速度将保持不变，直到您拦截轮廓为止。

当您位于垂直轮廓上方并想从垂直计划上方截取它时

降低高度，按下VNAV按钮

降低所选高度

单击VNAV按钮以直接使用VNAV SPD进行下降

延长速度制动器/扰流板SpeakBrake以增加下降率或进行如下所述的速度干预

VNAV ALT的高度干预Altitude Intervention

When ever the MCP selected altitude is captured with VNAV active or armed VNAV ALT engages. This indicates that the climb or descent has been interrupted and the aircraft is no longer climbing or descending on profile.

Mouse over the selected altitude knob and rotate your mouse wheel to set a new selected altitude to climb or descent towards

Click the altitude knob to continue the climb or descent in VNAV SPD or VNAV PATH

Note - During the descent it is normal to level off at the MCP altitude to intercept the glide slope.

只要在VNAV处于启动状态或武装VNAV ALT时捕获MCP选择的高度。这表明爬升或下降已经中断，飞机不再在轮廓上上升或下降。

VNAV ALT时的高度干预

将鼠标悬停在选定的高度旋钮上，并旋转鼠标滚轮以设置新的选定高度，以向上爬升或下降

单击海拔高度旋钮以继续在VNAV SPD或VNAV PATH中进行爬升或下降

注 -在下降期间，通常在MCP高度上稳定下来以拦截下滑道。