737 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 11.31.31
The speed descent normally begins automatically at the calculated T/D, provided
the MCP altitude is reset for the descent. At the T/D, the FMC commands pitch to
maintain target descent speed. LNAV does not have to be engaged in order to fly
a VNAV speed descent.
The descent attempts to comply with waypoint altitude restrictions, and will not
violate these restrictions. The VNAV speed descent will not, however, guarantee
the airplane reaches an altitude restriction at the required point.
A speed descent cannot automatically revert to a path descent, except during
STAR, approach transition, or approach leg with a vertical angle. However, if all
required parameters for a path descent are available, a path descent may be
manually selected at any time by selecting the PATH prompt on the speed descent
page.
September 15, 2016
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