AIRCRAFT FLIGHT
MANUAL
BRISTELL B23
Document No.: ADXC-73-001-AFM
Non-approved page
Revision: A2
7-45
Date of Issue: 15.04.2021
Envelope protection, Electronic Stability & Protection (ESP-X)
ESP monitor the aircraft and provide control input feedback when
necessary to discourage operating the aircraft at potentially unsafe
attitudes and/or airspeeds. If enabled (which is the default setting), this
feature will automatically arm when the aircraft is above 500 feet AGL
and the autopilot is not engaged, and disarm when below 200 feet AGL.
When selected, ESP engages automatically when the aircraft
approaches or exceeds one or more predetermined airspeed or attitude
limitations.
NOTE
If AGL height data is unavailable (i.e., GPS altitude or terrain data is
unavailable), automatic engagement of Level mode is not supported
Stability protection for each flight axis is provided by the autopilot servos,
which apply force to the appropriate control surface(s) to discourage pilot
control inputs that would cause the aircraft to exceed the normal or
"protected" flight envelope. This is perceived by the pilot as resistance to
control movement in the undesired direction when the aircraft
approaches a steep attitude, and/or the airspeed is below the minimum
or above the maximum configured airspeed. As the aircraft deviates
further from the normal attitude and/or airspeed, the force increases
proportionally (up to an established maximum) to encourage control
movement in the direction necessary to return to the normal attitude
and/or airspeed range. When ESP has been engaged for more than
fifteen seconds (cumulative; not necessarily consecutive seconds) of a
30-second interval, the autopilot can be configured to engage with the
flight director in Level Mode, bringing the aircraft into level flight. An aural
“Autopilot” alert is played and the flight director mode annunciation will
indicate ‘LVL’ for vertical and lateral modes. Level mode as activated by
ESP is limited by altitude. ESP will not be able to activate Level mode
until the aircraft climbs above 2000 feet AGL. ESP will be locked out of
automatically activating Level mode after the aircraft descends below
1500 feet AGL as well. Also note that Level mode as activated by ESP is
different than manually selected Level mode. Manually selected Level
mode is not limited by altitude at all. The pilot can interrupt ESP by
pressing and holding the Autopilot Disconnect / Control Wheel Steering
(AP DISC / CWS) switch. Upon releasing the AP DISC / CWS switch,
ESP force will again be applied. ESP can also be overridden by
overpowering
the servo’s torque limit. ESP is enabled or disabled from
the Automatic Flight Control System page