| Honeywell MCP |
| Mode Control Panel |
Altitude Hold (ALT HLD) Switch
Push –
Altitude Hold Command Mode
ALT HOLD mode commands pitch to hold either:
Push –
- Engages ALT HOLD command mode.
- Commands pitch to hold uncorrected barometric altitude at the altitude
when the switch was pressed. - Annunciates ALT HOLD pitch mode and illuminates ALT HLD switch
light.
Altitude Hold Command Mode
ALT HOLD mode commands pitch to hold either:
- MCP selected altitude
OR
When in ALT HOLD at the selected MCP altitude:
- Uncorrected barometric altitude at the altitude when the ALT
HLD switch was pressed if not at the MCP selected altitude.
When in ALT HOLD at the selected MCP altitude:
- Selecting a new MCP altitude illuminates the ALT HLD switch
light and arms V/S mode.
- LVL CHG, V/S, and VNAV climb and descent functions are
inhibited until a new MCP altitude is selected.
- Pitch mode annunciates ALT HOLD.
- ALT HLD switch light extinguishes.
- Pitch mode annunciates ALT HOLD
- ALT HLD switch light illuminates.
