*
The airplane is greater than 50 feet above the ground
*
Data to calculate the lateral guidance command is valid
*
Aircraft position is satisfactory for capture.
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777 AIRCRAFT MAINTENANCE MANUAL
AFDS -OPERATION -LNAV
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AFDS -OPERATION -HEADING/TRACK SELECT
General
The pilot uses the HDG/TRK select mode to change the airplane heading.
The select switch (SEL) on the MCP does not have a LED in the switch.
This example shows operation with HDG selected on the heading/track display. Operation with TRK selected is the same except for the display on the PFDs.
There are two ways to use the mode:
*
Set heading before the mode is selected
*
Select the mode before the heading is set.
Set Heading Before Mode
First, set a heading in the heading/track display. Then push the heading select switch. These things happen:
*
HDG SEL shows on the PFD
*
The airplane turns in the direction for minimum heading change
*
The airplane captures and holds the heading set on the MCP.
Select Mode Before Heading
First, push the heading select switch. Then set a heading in the heading/track display. These things happen:
*
HDG SEL shows on the PFD
*
When the pilot turns the heading knob clockwise, the airplane banks to the right
*
When the pilot turns the heading knob counterclockwise, the airplane banks to the left
*
The airplane captures and holds the heading set on the MCP.
Heading/Track Select Bank Angle Limit
The pilot uses the bank limit selector on the MCP to limit the airplane bank angle. In the AUTO position, the bank angle limit changes with true airspeed.
Below 200 feet, the bank angle limit is eight degrees.
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AFDS -OPERATION -HEADING/TRACK SELECT
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AFDS -OPERATION -HEADING/TRACK HOLD
General
In this mode, the airplane holds a heading or a track angle. The pilot can set a heading or a track in the MCP displays before the mode is set.
This example shows operation with HDG selected. Operation with TRK selected is the same, except for the display on the PFDs and MCP.
Airplane In a Bank
When the pilot pushes the heading/track hold switch:
*
The heading/track hold light on the MCP comes on
*
The airplane rolls wings level
*
HDG HOLD is shown on the PFDs
*
The airplane holds the heading present when the bank angle is less than three degrees for two seconds.
Airplane Wings Level
When the pilot pushes the heading/track hold switch:
*
The heading/track hold light on the MCP comes on
*
HDG HOLD shows on the PFDs
*
The airplane holds the present heading.
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AFDS -OPERATION -HEADING/TRACK HOLD
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AFDS -OPERATION -PITCH INTRODUCTION
General
These AFDS pitch modes are available during climb, cruise and descent:
*
Vertical navigation (VNAV)
*
Vertical speed (V/S)
*
Flight path angle (FPA)
*
Flight level change (FLCH)
*
Altitude hold (ALT).
VNAV
The VNAV mode is a mix of throttle and elevator commands that control the vertical flight path.
The FMCF vertical steering commands come from the active FMCF based on the navigation data and the active flight plan.
Vertical Speed/Flight Path Angle
The vertical speed or flight path angle command is an elevator command. The pilot uses this mode to change flight levels. The pilot must set the engine thrust necessary to hold the vertical speed or flight path angle command.
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本文链接地址：777 AMM 飞机维护手册 自动飞行 Autoflight(15)
