Hi HN39,
Originally Posted by HazelNuts39
With reference to this question and your reply, how do you explain (on page 112 of the french report, also on page 113) the cycling of 'Mach selecté' between 02:00:00 and 02:09:55? Is this Mach_1, Mach_2 or Mach_3?
None as it is unrelated to ADR Machs.
Mach "selecté" or "selected Mach" is entered manually by the pilot in "selected" mode or managed by the FMA in "managed mode". Of course, one needs an autopilot working in order to use the flight guidance.
Consequently, this graph value represents the "Mach" targeted currently selected/used before autopilot kicked off.
Last change was at 0209:58 when "managed" mode was switched to "selected" mode, and pilots set it at Mach 0.80 (they were reducing targeted Mach). So before this point, Mach variations should have been automatically managed.
Looking at graphs pages 112-113, Mach_selecté is the blue straight line at M.80 (barely visible on the second one). The green value should be ADR_Mach_1 (as there is no ISIS_Mach). The blue blocks should be periods of flight in managed_Mach.
Mach_selecté do not move at all during the event like altitude_selectée ; the last one was rather the active mode (vertical)... hence, maybe this "je te mets sur ATT" would rather be "je te mets sur ALT".
But I'm not sure, I need to verify this last point.