| Honeywell MCP |
| Mode Control Panel |
VNAV Switch
Push –
VNAV Mode
The FMC commands AFDS pitch and autothrottle to fly vertical
profile selected on the FMC CDUs. Profile includes climb, cruise,
descent, speeds, and can also include waypoint altitude constraints.
Push –
- VNAV switch light illuminates.
- Pitch mode annunciates VNAV SPD, VNAV PTH, or VNAV
ALT. - A/T mode annunciates FMC SPD, N1, RETARD, or ARM.
- IAS/MACH display blanks and airspeed cursors positioned to
FMC commanded airspeed.
VNAV Mode
The FMC commands AFDS pitch and autothrottle to fly vertical
profile selected on the FMC CDUs. Profile includes climb, cruise,
descent, speeds, and can also include waypoint altitude constraints.
Climb –
Cruise –
- Autothrottle holds FMC thrust limit.
- AFDS holds FMC target speed.
- Automatic level-off occurs at MCP altitude or VNAV altitude,
whichever is reached first.
Cruise –
- Autothrottle holds FMC target speed.
- AFDS holds FMC altitude.
- Selecting a lower MCP altitude arms FMC to automatically
- begin descent upon arrival at FMC top of descent point.
- MCP constrained altitude annunciates VNAV ALT.
- VNAV constrained level-off annunciates VNAV PTH.
