737 Flight Crew Operations Manual
Automatic Flight -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 4.10.3
N1 Mode
• A/T maintains thrust at N1 limit selected from FMC CDU. N1 mode
engaged manually by pushing N1 switch if N1 mode is compatible with
existing AFDS modes. N1 mode engages automatically when:
• engaging LVL CHG in climb (except during inhibit period for 2 1/2
minutes after lift-off)
• engaging VNAV in climb.
6 SPEED Switch
Push – (light not illuminated)
• engages A/T in SPEED mode if compatible with engaged AFDS modes
• illuminates SPEED switch light
• annunciates MCP SPD autothrottle mode
• maintains speed in MCP IAS/MACH display.
Push – (light illuminated)
• deselects speed mode and extinguishes switch light
• engages A/T in ARM mode.
Speed Mode
Autothrottle holds speed in IAS/MACH display or a performance or limit speed.
Speed mode engaged manually by pushing SPEED switch if speed mode is
compatible with existing AFDS modes. Speed mode engages automatically when:
• ALT ACQ engages
• ALT HOLD engages
• V/S engages
• G/S capture occurs.
When the “N1 SET” outer knob is in the AUTO position the A/T will not set thrust
above the displayed N1 limit, however, A/T can exceed an N1 value manually set
with the “N1 SET” outer knob in the manual BOTH, 1, or 2 position. Setting the
thrust reference manually is intended to provide guidance when manually
controlling thrust.
7 IAS/MACH Selector
Rotate –
• sets speed in IAS/MACH display and positions airspeed cursor
• selected speed is reference speed for AFDS and A/T
• not operative when IAS/MACH display is blank.
March 28, 2013
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