Landing gear function and indication
When the landing gear module is activated, and all legs are at their
fully extended end switches, the red and green LEDs on the control
panel flash slowly four times (1Hz).
The landing gear electrical circuit is connected to the pitot-static
circuit via a pressure sensor. The pressure sensor is adjusted to
activate at speeds of 100 km/h (55 KIAS) or slower. When activated
the control system prevents the retraction of the gear below 100
km/h (55 KIAS), thereby preventing the unintentional retraction of
the landing gear whilst the aircraft is on the ground.
When “LG UP” is selected the landing gear will retract if the speed
is greater than 100 km/h (55 KIAS). The red LEDs will flash slowly at
1Hz until the gear legs are up and locked in the retracted position.
If the landing gear fails to reach the end switch within 25 seconds
the red LEDs will flash rapidly at 3.3Hz.
At the end of the gear retraction cycle, and when all end switches
have been reached, the RED LEDs will remain on (solid) for 10
seconds and then turn off. The landing gear control system module
functionality can be checked in flight by selecting “LG UP”, the red
LEDs will flash 3 times slowly at 1Hz and then turn off.
When “LG DOWN” is selected the landing gear will deploy at
airspeeds up to V
LO
, 130 km/h (70 KIAS). During gear extension the
green LEDs will flash slowly at 1Hz until the gear is down and
locked, when down and locked the green LEDs will remain lit. If the
gear does not fully deploy and actuate the end switches after 25
seconds, the green LEDs will flash rapidly at 3.3Hz.
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