737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
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11.43.2 D6-27370-866-EGP
• If Altitude Intervention is used to initiate descent when more than 50
NM to T/D with VNAV engaged and the MCP ALT below current
altitude but at or above any descent constraint altitude, the result will be
cruise altitude reset to the MCP ALT and Cruise Descent vertical speed
commands of -1000 fpm to the new cruise altitude.
• If Altitude Intervention is used to initiate descent when more than 50
NM to T/D with VNAV engaged and the MCP ALT below current
altitude and below a descent constraint altitude, the result will be Early
Descent vertical speed commands of -1000 fpm until path intercept or
MCP ALT level off occurs.
Descent
During descent, LNAV progress is managed using the RTE LEGS and
PROGRESS pages, as in the cruise phase. VNAV descent management is
accomplished primarily on the DES page.
Other pages which support descent are:
• DES FORECASTS page – to enter forecast wind data to aid descent
planning
• ALTERNATE DESTS page – to manage the selection of alternate
airports and diversions.
September 15, 2016
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