7-4-6
Air / Ground System
The aircraft “in air” or “on ground” (AIR/GND) status is determined from a combination of
aircraft systems interfaced to the MAU:
−
LH main gear proximity switch
−
RH main gear proximity switch
−
Radar Altimeter - altitude
−
Calibrated airspeed (ADAHRS computed).
By comparison monitoring of the above systems the MAU determines the AIR/GND status of
the aircraft. MAU Channel A outputs a discrete signal to control the LH AIR/GND relays. MAU
Channel B outputs a discrete signal to control the RH AIR/GND relays.
The LH AIR/GND signal is sent to the following systems:
−
Propeller de-ice
−
Flaps
−
ECS
−
LH Stick Pusher Computer
−
Flight Time Counter.
The RH AIR/GND signal is sent to the following systems:
−
RH Stick Pusher Computer
−
Logo Lights (optional system).
If the MAU determines a disparity between the monitors by comparison monitoring, a correct
determination of the AIR/GND status is still possible as the suspect (invalid) monitor is
disregarded in the determination. When the MAU determines that all monitors disagree it
results in an invalid AIR/GND state. If the AIR/GND state is invalid a
Air/Ground Fail
will be
shown on the CAS.
When
Air/Ground Fail
shows the AIR/GND state defaults to AIR.
A dormant fault in the LH and RH main gear proximity switches is possible as a result of the
AIR/GND monitor function of the MAU. To avoid this CAS status alerts will be given for
LH
WOW Fault
,
RH WOW Fault
or
LH + RH WOW Fault
when the MAU determines either
or both proximity switch inputs are invalid.
7-4-7
Brakes
, Brake System, for system operation.
Aircraft braking is provided by two brake assemblies, one bolted to each main landing gear
axle. The brakes are controlled by toe pedals attached to each rudder pedal assembly. The
pilot and copilot left toe brakes operate the left brake while the pilot and copilot right toe brakes
operate the right brake.
Section 7 - Airplane and Systems Description
Air / Ground System
Pilot's Operating Handbook
Report No: 02406
Issue date: Mar 06, 2020
Page 7-4-9
12-C-A15-00-0704-00A-043A-A
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