LOC和APPR

The localizer button (LOC) arms the localizer capture. If there is an ILS localizer signal the autopilot will capture the runway localizer and fly towards the runway. It only steers left and right for this, it doesn't change the vertical mode.

The approach button (APPR) does the same but also arms the glide slope capture. After capturing the localizer (LOC* or LOC), when the glide slope is intercepted, the autopilot will capture it (G/S*) as well and automatically descent to the runway threshold in G/S mode. When LOC and G/S are both captured a fully automatic landing can be performed if the runway allows for that.

At 400 feet above ground the autopilot will switch to LAND mode and no buttons on the flight control unit (FCU) will change that. The only way to leave this mode is to go around or land. At 50 ft the autopilot switches from LAND to FLARE. It will automatically arrest the sink rate, retard the thrust to idle, touch down and roll out. Between twenty and ten feet you need to retard the thrust levers to idle because the auto-spoilers and auto-brakes only engage when the levers are at idle or in reverse.

本地化按鈕(LOC)武裝本地化捕獲。如果有ILS定位器信號，則自動駕駛儀將捕獲跑道定位器并飛向跑道。為此，它只會左右轉(zhuǎn)向，而不會改變垂直模式。

接近按鈕(APPR)的功能相同，但也可以捕獲滑坡坡度。捕獲到定位器(LOC *或LOC)后，當滑坡被攔截時，自動駕駛儀也將捕獲它(G / S *)，并在G / S模式下自動下降到跑道入口。如果同時捕獲了LOC和G / S，則可以執(zhí)行全自動著陸。

在距地面400英尺處，自動駕駛儀將切換到LAND模式，并且飛行控制單元(FCU)上的任何按鈕都不會改變它。離開此模式的唯一方法是復(fù)飛或降落。在50英尺處，自動駕駛儀將從LAND切換到FLARE。它將自動阻止下沉速度，將推力延遲至空轉(zhuǎn)，著陸并展開。在20到10英尺之間，您需要使 推力桿 撥到 空轉(zhuǎn)，因為自動擾流板和自動制動器僅在桿空轉(zhuǎn)或倒轉(zhuǎn)時才啟用。