Originally Posted by
downwind
Hi All,
Automatic Flight Takeoff: When you press TOGA on the Classic and NG the FD bar roll command maintains wings level till 400 ft RA.
F/D Go–Around & A/P Go–Around: F/D roll commands hold current ground track at or below 50 feet AGL for NG and above Above 400 feet RA for the classic.
1. Why does the track guidance differ for a go-around and take off? (I think the case of a big crosswind etc…)
2. Two engine F/D Go–Around & two engine A/P Go–Around: When you press TOGA, the command airspeed cursor automatically moves to a target airspeed for the existing flap position based on maximum takeoff weight calculations, why is this logic used for the classic and NG flap retraction based on a max takeoff calculation?
3. On the classic, the EGPWS contains a internal GPS, is this the same for the NG?
Thank you.
1. It actually depends on MSNs and if You have preselected LNAV before takeoff for example. In that case LNAV will become engaged at 50ft AGL on takeoff. During go around You also get LNAV above 50 ft AGL for certain MSNs. The latter is a requirement to qualify the aircraft for RNP (AR) approaches.
3. The EGPWS terrain display is correlated to the aircraft GPS position.