Landing gear Flashcards
what type of landing gear does the da42 have
fully retractable tricycle landing gear
hydraulically operated, electrically powered
nose gear is steerable
features of the main gear
wheel attaches to trailing link
gas/oil damper attaches to rear of strut and trailing link to absorb landing loads
features of the nose gear
steering obtained by rudder control system w steering linkage
wheel turn limit of 30 degrees
has spring damper to prevent shimmy and vibration
where is the hydraulic block located
rear of aft cockpit bulkhead on the left side
how does the landing gear operate
hydraulic system extends and retracts gear
folding stays lock the gear in place w. latching mechanism
electrically operated valves deliver pressure to actuators to move the gear (pressure keeps gear retracted)
how much psi is the pressure regulating valve
1800psi
how much psi is the pressure relief valve
2600psi
what do the solenoid valves do
control the flow of hydraulic pressure in the system
what does the pump pressure switch do
closes when below 1400 psi and opens when above 1650 psi
whats the difference between full pressure and differential pressure
for differential pressure, fluid pressure is acting on different effective areas of the piston
how many weight on wheels switches does the da42 have
9
emergency extension limitations
up to 156 kts
can take up to 20 seconds
how is the emergency gear extension operated
with the emergency extension lever on the left side of the cockpit
failure of electrical system causes gear to automatically extend
when will the landing gear horn sound
if switches closed and gear is up, when power is below 14 inches
features of the braking system
2 sets of master cylinders
operated with toe of rudder pedal
