(Boeing 737 NG FCOMv2 - 11.31.38 - Flight Management, Navigation - Flight Management System Operation) with flaps down, VNAV remains in VNAV PTH.during a path descent with flaps up on an idle leg, VNAV switches to VNAV SPD.Using SPD INTV will usually cause the vertical mode to switch from VNAV PTH mode to VNAV SPD mode, which does not care guarantee to comply with crossing restrictions: (Boeing 737 NG FCOMv2 - 11.31.37 - Flight Management, Navigation - Flight Management System Operation) when preparing for a missed approach and the MCP altitude is set at leastģ00 feet above the current airplane altitude, VNAV will continue to.When the FMC is “on approach”, the following features are available: Once the aircraft is descending on final approach, one can set go-around altitude into the window: (Boeing 737 NG FCOMv2 - 4.20.20 - Automatic Flight - System Description) The autopilot/flight director will capture and track the localizer/final approach Selecting the APP button on the AFDS Mode Control Panel (MCP).
The Integrated Approach Navigation (IAN) modes are armed/engaged by This will allow VNAV to descend further and is required unless IAN with G/P is used: When cleared for final approach, one can also set the DA (Decision Altitude) for the approach instead of a crossing restriction into the window. As long as the aircraft is descending in VNAV PTH mode, it will follow all altitude crossing restrictions.
The safest thing to do when cleared for the approach is to set the MCP altitude window to the lowest altitude restriction because that way you won't forget to lower it again. This usually depends on the airline SOPs.
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