Altitude Preselect

With great power comes great responsibility. Altitude preselect can keep you out of trouble, reducing altitude errors. But, it can also cause trouble if misused.

Of all the features of the modern Automatic Flight Control System (AFCS), perhaps the most useful is altitude preselect. It improves safety by reducing altitude busts and deviations. However, it can s…
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  1. ERROR: In Intercepting GS From Above, the bottom of the fifth paragraph says: ”…the AP will capture this altitude unless G/S mode is selected”. It should read: “… the AP will capture this altitude unless G/S mode is engaged/captured”. Selecting (arming) APR will not prevent the autopilot from capturing an altitude above the glideslope.

    The ALT SEL mode cannot become active and level the aircraft after capturing the glideslope. Once another mode, such as Go-Around, is selected, ALT SEL will function “normally” again.


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