The altitude hold mode (ALT) either engages automatically when the selected altitude is capturing or is activated by pressing the altitude HOLD button. In this case the TO/GA vertical mode is engaged (see below). Going around can be done with the TO/GA buttons. The mode cannot be selected manually, it can only be disengaged by the touch down or going around. After touch down the FLARE mode disengages and no active mode is displayed to the pilots. Together with the lateral ROLLOUT mode the FLARE mode will enable the aircraft to touch down on the runway, fully automatic. V/S engages instead.Īt 1500ft RA when LOC and G/S are captured the FLARE mode will arm, as can be seen on the PFD in the second line of the FMA. Similarly, when the localizer signal is lost or the localizer deviates too much and the localizer tracking is lost then glide slope is disengaged as well. The aircraft will not descent when it is not established on the localizer yet. Note - The glide slope can only capture after the localizer. It can be intercepted from below or above. The glide slope captures when the glide slope diamond is moving towards the center. Click the APP button on the MCP to arm the localizer and glide slope capture when an ILS is received
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