3-24 Pilot’s Guide 190-01717-10 Rev. H
Advanced Features
3.7 Altitude Preselect Functions
FEATURE LIMITATIONS
• Mode availability is dependent upon autopilot type
3.7.1 Arming Altitude Capture
Depending on the autopilot and flight director interface, the GDU provides altitude
preselect capabilities. This allows autopilot to capture a preselected altitude.
If arming is required, ALT CAP arms the altitude capture function and sets the
altitude bug.
3.7.2 Enabling Vertical Speed Control
Depending on the autopilot and flight director interface, the GDU provides vertical
speed commands to autopilots.
If the autopilot does not support altitude preselect functionality, then the
selected altitude selected field acts as an altitude alerter. For more about the
selected altitude and altitude alerting functions, refer to section 2.7.
1. Specify altitude value.
2. Set ALT CAP to “ARMED.”
An optional ARM key is available on the
GCU 485 control panel.
1. Specify vertical speed value.
2. Set VS ENG to ENGAGED.
VS key label changes to reflect mode status.
“AUTO” indicates the autopilot is actively
scheduling vertical speed.
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