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

在巡航階段，目標高度是巡航高度，在下降高度TOD之后，目標高度朝著目的地機場減小。VNAV PATH上下傾斜以保持在此計算出的目標高度，通常只有很少甚至是空轉怠速推力。

在巡航高度 時要武裝VNAV PATH下降：

單擊VNAV按鈕

單擊VNAV按鈕。由于已經(jīng)擊中了垂直計劃，因此將直接啟動VNAV

當您處于ALT，V / S或FLCH且位于垂直計劃下方并且想要攔截它時

選擇底高度，按下VNAV按鈕

選擇較低的高度

按下VNAV按鈕。武裝后的VNAV將在飛行模式信號器上以白色現(xiàn)實。如果您在VNAV之前處于ALT狀態(tài)，則ALT會起作用，并且高度會保持不變，直到您攔截輪廓為止。如果您使用的是FLCH，則可能要考慮切換到V / S并降低下降率，以便能夠截取輪廓。在V / S中時，所選的垂直速度將保持不變，直到您攔截輪廓為止。

當您位于垂直輪廓上方并想從垂直計劃上方截取它時

降低高度，按下VNAV按鈕

降低所選高度

單擊VNAV按鈕以直接使用VNAV SPD進行下降

延長速度制動器/擾流板SpeakBrake以增加下降率或進行如下所述的速度干預

VNAV ALT的高度干預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處于啟動狀態(tài)或武裝VNAV ALT時捕獲MCP選擇的高度。這表明爬升或下降已經(jīng)中斷，飛機不再在輪廓上上升或下降。

VNAV ALT時的高度干預

將鼠標懸停在選定的高度旋鈕上，并旋轉鼠標滾輪以設置新的選定高度，以向上爬升或下降

單擊海拔高度旋鈕以繼續(xù)在VNAV SPD或VNAV PATH中進行爬升或下降

注 -在下降期間，通常在MCP高度上穩(wěn)定下來以攔截下滑道。