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reference while in the polar region. This provides a more intuitive navigation
display and allow tracking of the planned route in HDG SEL. True track may be
obtained from the computer flight plan or from the Navigation Display. Magnetic
compass information should be used, if available, to update the heading reference
when departing the polar region. With a total IRS failure, plan a raw data ILS or
Non-ILS approach.
October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 4.19
Descent
Descent Speed Determination
The default FMC descent speed schedule is an economy (ECON) descent from
cruise altitude to the airport speed transition altitude followed by a descent at ten
knots less than this speed. The speed schedule is adjusted to accommodate
waypoint speed/altitude constraints displayed on the LEGS pages, and
speed/altitude constraints displayed on the DES page. If desired, the ECON speed
schedule can be modified by alternate Mach, Mach/IAS, or IAS values on the DES
page target speed line. If the FMC information is not available, use target speeds
from the Descent Rates table in this chapter.
Descent Path
777-200 - 777-300ER
An FMC path descent is the most economical descent method. At least one
waypoint-related altitude constraint below cruise altitude on a LEGS page
generates a descent guidance path. The path is built from the lowest constraint
upward, assuming idle thrust, or approach idle below the anti-ice altitude entered
on the DESCENT FORECAST page.
787-8
An FMC path descent is the most economical descent method. At least one
waypoint-related altitude constraint below cruise altitude on a LEGS page
generates a descent guidance path. The path is built from the lowest constraint
upward, assuming thrust slightly greater than idle, or approach idle below the
anti-ice altitude entered on the DESCENT FORECAST page.
The path is based on the descent speed schedule, any entered speed/altitude
constraints or forecast use of anti-ice. The path reflects descent wind values
entered on the DESCENT FORECAST page.
Descent Constraints
Descent constraints may be automatically entered in the route when selecting an
arrival procedure, or manually entered through the CDU.
Set all mandatory altitude restrictions and “at or above” constraints in the Mode
Control Panel (MCP) altitude window. The next altitude may be set when the
restriction has been assured or further clearance has been received.
October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
4.20 FCT 777/787 Preliminary (TM)
Shallow vertical path segments may result in the autothrottle supplying partial
power to maintain the target speed. Vertical path segments steeper than an idle
descent may require the use of speedbrakes for speed control. Deceleration
requirements below cruise altitude (such as at 10,000 MSL) are accomplished
based on a rate of descent of approximately 500 fpm. When a deceleration is
required at top of descent, it is performed in level flight.
Speed Intervention
VNAV speed intervention can be used to respond to ATC speed change
requirements. VNAV SPD pitch mode responds to speed intervention by changing
airplane pitch while the thrust remains at idle. VNAV PTH pitch mode may require
the use of speedbrakes or increased thrust to maintain the desired airspeed.
Offpath Descent
The LEGS pages should reflect the planned arrival procedure. If a published
arrival procedure is required for reference while being radar vectored, or the
arrival is momentarily interrupted by a heading vector from ATC, the offpath
descent circles provide a good planning tool to determine drag and thrust
requirements for the descent.
The outer circle is referenced to the end of descent point, using a clean
configuration and a direct path from the airplane position to the end of descent
waypoint constraint. The inner circle is referenced to the end of descent point
using speedbrakes. A separate waypoint may be entered on the OFFPATH DES
page as a reference for the descent circles.
Both circles assume normal descent speed schedules, including deceleration at
transition altitude, but do not include waypoint speed and altitude constraints.
Descent Preparation Using HUD System
787-8
If the combiner was previously stowed, the combiner should be positioned and the
pilot should verify that it is properly aligned with the overhead unit. For night
　
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