MCP Mode Selector Switches
The mode selector switches are pushed to select desired command modes for the
AFDS (Autopilot Flight Director System) and A/T (Autothrottle). The switch illuminates to
indicate mode selection and that the mode can be deselected by pushing the switch again.
While a mode is active, deselection can be automatically inhibited and is indicated by the
switch being extinguished.
When engagement of a mode would conflict with current AFS (Automatic Flight System)
operation, pushing the mode selector switch has no effect. All AFDS modes can be
disengaged either by selecting another command mode or by disengaging the A/P and
turning the F/Ds off.
Autopilot Engagement Criteria
Each A/P (Autopilot) can be engaged by pushing a separate CMD (Command) or CWS
(Control Wheel Steering) engage switch. A/P engagement in CMD or CWS is inhibited
unless both of the following pilot–controlled conditions are met:
• No force is being applied to the control wheel.
• The STAB TRIM AUTOPILOT cutout switch is at NORMAL.
Only one A/P can be engaged at a given time unless the approach (APP) mode is
engaged. Approach mode allows both A/Ps to be engaged at the same time. Dual
A/P operation provides control through landing flare and touchdown or an
automatic go–around.
In single A/P operation, full automatic flare and touchdown capability and A/P
go–around capability are not available.
