T SYSTEM - ENGINE DISPLAY
A/T SYSTEM - ENGINE DISPLAY
EFFECTIVITY
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General
The A/T operates on the ground for takeoff, and during flight.
The A/T system controls engine thrust for these flight
sequences:
* Takeoff
* Climb
* Cruise
* Descent
* Approach
* Flare
* Go-around.
For each flight phase, the A/T N1 or speed modes may be
selected from the MCP. If the DFCS is engaged, it selects the A/
T mode. The N1 or speed mode select switch light comes on to
show the mode is active. When the light is on, a second push
removes the mode from active status.
You use the TO/GA switches to start the takeoff or go-around
modes.
A/T SYSTEM - OPERATION - OVERVIEW
EFFECTIVITY
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A/T SYSTEM - OPERATION - OVERVIEW
A/T SYSTEM - OPERATION - OVERVIEW
EFFECTIVITY
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A/T SYSTEM - OPERATION - OVERVIEW
22-31-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
To prepare the FMS and the A/T for takeoff, you use the FMC
CDU to enter the necessary preflight data, and the DFCS MCP to
select parameters and set desired modes.
This is the takeoff sequence:
* Preflight
* Takeoff Start
* Takeoff Roll
* Climbout.
Preflight
These are the steps for preflight prior to takeoff:
* To preflight the FMS, enter data on the FMC CDU
* Set the DFCS MCP to takeoff modes and parameters
* Put the A/T arm switch to the ARM position on the MCP.
These are the indications after preflight is complete:
* A/T is in ARM mode
* A/T mode lights are off on the MCP
* TO is the FMC thrust mode
* N1 reference cursors are at FMC takeoff N1 limit.
Takeoff Start
At the start of the takeoff roll, the pilot pushes a TO/GA switch
on the thrust levers. The A/T active mode becomes N1 for
takeoff, and the A/T moves the thrust levers to the FMC
calculated takeoff N1 limit.
These are the indications at the start of takeoff:
* A/T goes to N1 mode
* N1 mode light is OFF
* TO is the FMC thrust mode
* N1 reference cursors are at FMC takeoff N1 limit
* T/Ls move forward to a target TRA for the N1 limit.
Takeoff Roll
As engine thrust and RPM increase to the takeoff N1 limit, the
airplane accelerates. When the airspeed gets to 80 kts, the A/T
goes in to throttle hold mode. At 84 knots, the A/T mode
changes from N1 to THR HLD on the FMA. These are the
indications at 84 kts:
* THR HLD shows on the FMA as the active A/T mode
* TO shows on the TMA as the FMC thrust mode
* N1 reference cursors are at FMC takeoff N1 limit.
In throttle hold mode, the A/T removes power from the ASMs
and does not command thrust. The T/Ls remain at the target
TRA for the takeoff N1 limit. The pilot can control thrust
manually if desired.
A/T SYSTEM - OPERATION - TAKEOFF
EFFECTIVITY
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Climb Out
During the initial climb out, above a barometric altitude of 800
feet above field elevation and 10 seconds after liftoff, the A/T
mode changes from THR HLD mode to ARM mode. These are
the indications:
A/T goes to
* ARM mode
* TO is the FMC thrust mode
* N1 reference cursors are at FMC takeoff N1 limit
* T/Ls remain at target TRA for takeoff N1 limit.
After takeoff is complete, the pilot may select a new A/T mode
from the MCP, either N1 or speed mode, when above 800 feet
barometric altitude. If DFCS is engaged during climb out, DFCS
selects an A/T mode, either N1 or Speed mode, consistent with
the DFCS mode selected. During climb out above 800 feet baro
altitude, the N1 or Speed mode light may be ON depending on
the mode selected.
A/T modes show on the FMA on the primary (outboard) EFIS
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