Gear Position Indicating
This type of switch, mounted on the landing gear, completes a circuit to illuminate a green “down and locked” light.
What is a downlock switch?
This cockpit warning activates when throttle is reduced and the landing gear is not down.
What is a landing gear warning horn?
This is the primary purpose of an anti-skid system during landing.
What is preventing wheel lockup?
This system automatically applies braking upon landing without pilot input.
What is an auto-brake system?
This switch prevents the landing gear from retracting while the aircraft is on the ground.
What is a squat switch (weight-on-wheels switch)?
This color light typically indicates an unsafe or in-transit landing gear condition.
What is a red warning light?
This switch prevents landing gear warnings while the aircraft is on the ground.
What is a squat switch (weight-on-wheels switch)?
These components detect wheel speed and send signals to the anti-skid control unit.
What are wheel speed sensors?
Auto-brake systems are typically armed prior to landing using this cockpit control.
What is an auto-brake selector switch?
This cockpit control sends an electrical signal to initiate gear extension or retraction.
What is the landing gear selector (handle)?
This kind of indicating system provides continuous gear position instead of just up/down status.
What is a synchro (or transmitter-based) system?
n many aircraft, advancing this control will silence the landing gear warning horn.
What is the throttle?
This unit compares wheel speed and modulates brake pressure to prevent skidding.
What is the anti-skid control unit?
This condition must usually be met before auto-brakes will activate after touchdown.
What is weight-on-wheels (aircraft on ground)?
In many systems, this type of circuit ensures the gear cannot retract unless specific conditions are met.
What is an interlock circuit?
These switches are electrically closed only when the landing gear is fully extended and locked.
What are downlock switches?
This system’s primary purpose is to alert the pilot of an unsafe landing configuration.
What is the landing gear warning system?
When this condition is detected, the anti-skid system reduces brake pressure.
What is impending wheel lockup (or skid condition)?
This system works together with auto-brakes to prevent wheel skid during braking.
What is the anti-skid system?
This device routes electrical power to either the extend or retract side of a landing gear system.
What is a relay (or selector valve control circuit)?
A failure of this component could cause a gear to be down and locked but not show a green light.
What is a position switch (or indicator circuit)?
A faulty version of this switch can cause a warning horn even when the gear is down and locked.
What is a throttle position switch?
This type of system operation rapidly applies and releases brake pressure automatically.
What is brake pressure modulation?
If this system fails, auto-brake performance may be reduced or disabled.
What is the anti-skid system?
Loss of electrical power in many landing gear systems will typically result in this gear condition.
What is gear free-fall (or extend by gravity/emergency extension)?