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* VNAV automatically selects altitude targets and speed targets according to pilot MCP entries and the altitude and speed constraints in the FMS flightplan. | * VNAV automatically selects altitude targets and speed targets according to pilot MCP entries and the altitude and speed constraints in the FMS flightplan. | ||
* VNAV automatically selects pitch and thrust control modes to fly to the targets. For example during descent, VNAV chooses between a FLCH descent, a vertical speed (fixed rate-of descent), and an FMS path descent. In the case where VNAV selects vertical speed control mode, VNAV also selects the vertical speed target. | * VNAV automatically selects pitch and thrust control modes to fly to the targets. For example during descent, VNAV chooses between a FLCH descent, a vertical speed (fixed rate-of descent), and an FMS path descent. In the case where VNAV selects vertical speed control mode, VNAV also selects the vertical speed target. | ||
* for the descent and approach, VNAV automatically provides an optimum path that is used as the reference for all automated altitude/speed target and control mode selections. | * for the descent and approach, VNAV automatically provides an optimum path that is used as the reference for all automated altitude/speed target and control mode selections. | ||
In a study of the software of contemporary VNAV functions, Sherry & Polson (1999), found that the typical VNAV function automatically chooses the active altitude target from a possible list of sixteen, and chooses the active speed target from a possible list of twenty-six. | |||
For more info, see: | For more info, see: | ||
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* http://www.b737.org.uk/fmc.htm | * http://www.b737.org.uk/fmc.htm | ||
* http://code7700.com/g450_vnav.html | * http://code7700.com/g450_vnav.html | ||
* | * http://human-factors.arc.nasa.gov/ihi/research_groups/air-ground-integration/MACSassistant/MCP.htm | ||
{{Appendix|all| | |||
* {{cite web |url=http://human-factors.arc.nasa.gov/publications/20051025130903_VNAVCogEngJournal1TM.pdf |title=Why VNAV in Descent is Difficult to Use }} | |||
* {{cite web |url=http://www.smartcockpit.com/download.php%3Fpath%3Ddocs/%26file%3DGetting_To_Grips_With_Perfomance_Monitoring.pdf|title=getting to grips with aircraft performance monitoring (p.96 ff)}} | |||
* {{cite web |url=http://www.google.com/patents/US20060200279 |title=Method of determining a comparison of an aircraft's performance capabilities with performance requirements }} | |||
* {{cite web |url=http://www.google.com/patents/US20110118908 |title=Methods and systems for management of airplane speed profile }} | |||
}} | |||
== The Performance Database == | == The Performance Database == |