777 AMM 飞机维护手册 自动飞行 Autoflight(10)

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Altitude Increment Selector (Outer) and Altitude Selector (Inner)
The control has two concentric selectors.
The inner selector changes the reference altitude in the window. If you push the selector while in VNAV, you activate altitude intervention.
The outer selector changes the window increment. With the outer selector in the 1000 position, the inner selector changes the window at 1000 feet/detent.
With the outer selector in the AUTO position, the window change rate is 100 feet/detent. The altitude window also shows the barometric minimums you selected on both EFIS control panels.
For example, you select barometric minimum values of 290 feet on the left EFIS control panel, and 330 feet on the right EFIS control panel. As you rotate the outer selector, the altitude on the window changes as follows:
*
100

*
200

*
290

*
300

*
330

*
400

*
500, etc.

If you select the same barometric minimums value on both EFIS control panels, the MCP shows the value only once.
Once the values from the EFIS control panels show on the MCP, they stay on the MCP even if you change the EFIS control panel barometric minimums.
The MCP rounds up to the next 10 feet. So if you select a barometric minimums value of 181 feet, the MCP shows 190 feet.
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AFDS -MODE CONTROL PANEL -CONTROLS AND DISPLAYS

Vertical Speed/Flight Path Angle Selector
Rotate the selector up to decrease the value. Rotate the selector down to increase the value.
Bank Limit Selector (Outer), Heading/Track Selector (Middle), and Heading/Track Select Switch (Inner)
The control has two concentric selectors and one push-button.
The bank limit selector (outer) selects the bank angle limit used in the heading/track select mode.
The heading/track selector (middle) changes the value the window shows.
The heading/track select switch (inner) is a push-button switch. Push this switch to request the heading select or track select mode.
Autopilot Disengage Bar
The bar connects to three toggle switches. The bar is normally in the up position. Push the bar down to disengage all AFDCs.
IAS/MACH Selector
When not in VNAV, the IAS/MACH window shows the current target airspeed. Turn the IAS/MACH selector to change the target airspeed.
In VNAV, the IAS/MACH window is normally blank. If you push the selector, the window unblanks to show the current FMCF target airspeed. You can then turn the IAS/MACH selector to change the target airspeed. This is speed intervention.
Autothrottle (A/T) Engage Switch
This switch engages the autothrottle.
Climb/Continuous (CLB/CON) Thrust Switch
When two engines are in operation, this switch changes the autothrottle thrust reference to climb (CLB). When only one engine is in operation, it changes the thrust reference to maximum continuous (CON).
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AFDS -MODE CONTROL PANEL -CONTROLS AND DISPLAYS

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AFDS -AUTOPILOT FLIGHT DIRECTOR COMPUTER

Purpose * A/P interlock pins
* A/P options list.
The autopilot flight director computer (AFDC) calculates: This information shows for each AFDC.
*
Flight director (F/D) commands

*
Autopilot commands

*
Backdrive actuator commands.

Physical Description
The AFDC has modules, sub-assemblies, and a chassis assembly in an ARINC 600, 8 MCU box. The top and bottom covers let cooling air flow from the bottom to the top. The AFDC is a line replaceable unit (LRU). AFDC internal components are not LRUs.
Software Loading
The AFDCs must have operational software loaded in them. Shop personnel can load the software, or you can use the MAT to do a software load.
System Configuration
Use the MAT to monitor the AFDS configuration. You can monitor these things:
*
A/P hardware part number

*
A/P software number

*
A/P serial number

*
A/P configuration pins

*
A/P compatibility pins

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AFDS -AUTOPILOT FLIGHT DIRECTOR COMPUTER

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AFDS -AUTOPILOT FLIGHT DIRECTOR COMPUTER -FUNCTIONAL BLOCK DIAGRAM

General
This is a block diagram of the autopilot flight director computer (AFDC).
Input Signal Selection
　
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