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Originally Posted by e1cnr
Does anyone know how autopilots work in 777's? Do they go straight line toward destination or can you program multiple direction / elevation changes?
Yes, you can program in an entire route of flight (which is the norm) and it will follow that lateral route. For altitude changes, you can put in altitudes associated with various fixes on the route and it will either climb or descend to cross that fix at the specified altitude, but only if the higher or lower altitude has been set on the Mode Control Panel (MCP). Thus you could have it do a series of climbs or a series of descents, but you couldn't have it mix up climbs and descents without intervention.
Example: I have a route programmed from A to B to C to D. I have an initial altitude of 35000 and I have an altitude of 28000 set for B and then 15000 set for C. If I set 15000 on the MCP and fly in VNAV mode, the plane will fly the course and descend to cross B at 28000, where it will level off. It will begin a descent to 15000 at the appropriate time so that it crosses C at that altitude. Note: if I leave 35000 on the MCP, the descents will not happen and there's no way to have it automatically climb back up.
Last edited by W0X0F; 03-16-2014 at 03:53 PM.
Reason: Left out a word