[A] – Switches on the route following and barometric altitude stabilization modes. When the ACS is
active, this command pushes the "СБРОС" (RESET) button switching off any current mode including
the "УПРАВЛЯЙ ВРУЧНУЮ" (MANUAL CONTROL) mode and "УВОД НА ВЫСОТУ" (GROUND
COLLISION AVOIDANCE MODE).
[H] – Switches on barometric altitude stabilization mode. This is only possible when the bank angle is
less than 8 degrees and the heading is stabilized.
[LAlt-1] – Switches on the attitude hold mode (push-light switch "АВТОМ" is on) if the bank angle
is less than 8 degrees and the heading is stabilized.
[LAlt -2] – An alternative command to enable barometric altitude stabilization.
[LAlt -3] – Level to the horizon. In this mode, the ACS is not switched off by control stick overriding
and it has no pitch and bank angle limits. If this mode is on, the push-light switch "ПРИВЕД К
ГОРИЗ" (Level up to the horizon) is on in the lower right portion of the front cockpit panel.
Figure 44: "ПРИВЕД К ГОРИЗ" (Level to the horizon) annunciator
[LAlt -4] – An alternative command to enable barometric altitude stabilization. Same as [H].
[LAlt -5] – Switches on the radar altitude stabilization mode at altitudes between 300 to 1000m. At
a radar altitude of less than 50 meters or vertical velocity of more than -15 m/s, the "УВОД НА
ВЫСОТУ" (GROUND COLLISION AVOIDANCE MODE) mode is engaged automatically the bank angle
is zeroized and attain positive pitch using a g-load of up to 4 units.
[LAlt -6] – Switches on the route following modes. Simultaneously, the pitch is stabilized based the
value at mode initiation is used.
[LAlt -9] –Pushing the "СБРОС" (RESET) button switching off any current mode, including the
"УПРАВЛЯЙ ВРУЧНУЮ" (MANUAL CONTROL) mode and "УВОД НА ВЫСОТУ" (GROUND
COLLISION AVOIDANCE MODE). It also resets an ACS failure.
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