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displays. FMC thrust modes and FMC N1 limits show on the
upper engine display.
A/T SYSTEM - OPERATION - TAKEOFF
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General
During climbout, the A/T controls engine thrust to the A/T mode
selected on the DFCS MCP. This may be either N1 or speed
mode, depending on what you select, or if the DFCS is engaged,
the DFCS selects the A/T mode. During climb in N1 mode, the A/
T advances the throttles to the target TRA calculated by the EEC
for the FMC climb N1 target.
Initial Climbout
These are the possible DFCS pitch modes for climb:
* Vertical navigation (VNAV SPD)
* Level change (LVL CHG)
* Vertical speed (V/S).
After takeoff, you can engage the A/P above 400 feet radio
altitude and select a DFCS pitch mode for climb. The normal
pitch mode during climb is VNAV.
During takeoff and initial climbout, the A/T is in throttle hold
mode. As the airplane climbs above a barometric altitude of 800
feet and 10 seconds after lift-off, these mode annunciations
show:
* A/T goes from THR HLD to ARM mode
* A/T mode lights on the MCP are off
* MCP IAS/MACH window shows the selected speed
* TO is the FMC thrust mode
* N1 ref cursors stay at the FMC takeoff N1 limit
* T/Ls are at target TRA for FMC takeoff N1.
During climbout above 800 feet barometric altitude, you can
select an A/T mode such as N1 or speed. If the DFCS is
engaged, the DFCS selects an A/T mode consistent with the
DFCS pitch mode.
VNAV Climb
Normal climbout is in DFCS VNAV pitch mode. In VNAV, the
DFCS selects N1 as the A/T mode. These are the mode
annunciations during VNAV climb:
* A/T is in N1 mode
* N1 mode light is ON
* MCP IAS/MACH speed window is blank
* VNAV SPD is the DFCS pitch mode
* CLB is the FMC thrust mode
* N1 ref cursors are at FMC climb N1 limit
* A/T controls T/Ls to a target TRA for FMC climb N1.
During VNAV climb, the A/T controls engine thrust to the FMC
climb N1 target. The A/P uses elevators to control airspeed.
LVL CHG Climb
During climb, you can select LVL CHG on the MCP as the DFCS
pitch mode and the DFCS will select N1 mode for the A/T. These
are the mode annunciations in VNAV climb:
* A/T is in N1 mode
* N1 mode light is ON
A/T SYSTEM - OPERATION - CLIMB
EFFECTIVITY
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22-31-00-021
* MCP IAS/MACH window shows the selected speed
* MCP SPD is the DFCS pitch mode (for LVL CHG).
In DFCS LVL CHG climb, the A/T sets thrust to the EEC TRA
target. This TRA target is calculated by the EEC for an
equivalent FMC climb N1 target.
V/S Climb
During climb-out, you can select V/S as the DFCS pitch mode
and set the desired vertical speed. The DFCS will select MCP
SPD mode for the A/T. These are the mode annunciations in V/S
climb:
* A/T is in MCP SPD mode
* Speed mode light is ON
* MCP IAS/MACH window shows the selected speed
* V/S is the DFCS pitch mode.
During the V/S climb mode, the A/T controls engine thrust to
control airspeed to the speed selected on the MCP. The A/P
uses the elevator to hold the climb rate to the vertical speed
rate selected on the MCP.
A/T SYSTEM - OPERATION - CLIMB
EFFECTIVITY
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