Can you retract the landing gear?
Well, the short answer is no. Modern airplanes have something called “Squat switch”. Essentially it is a sensor, which can tell if a plane is still standing on the ground. That is why it is called squat switch – it senses when the landing gear is still squatting under the load of the plane.
How is the landing gear extended and retracted?
Through mechanical advantage, the pilot extends and retracts the landing gear by operating the lever. Use of a roller chain, sprockets, and a hand crank to decrease the required force is common. Electrically operated landing gear systems are also found on light aircraft.
How do we prevent the landing gear from retracting on the ground?
Ground locks are used in landing gear as extra insurance that the landing gear will remain locked in position while the aircraft is on the ground. A ground lock is an external device that is placed in the retraction mechanism to prevent its movement.
What type of motor is used in retractable landing gear system?
reversible electric motor
This system uses a two-position switch on the instrument panel, not unlike other landing-gear switches. In the Piper system, the switch controls a reversible electric motor. This motor is powered by the aircraft’s electrical system to operate a hydraulic pump used to pressurize hydraulic actuators.
How many types of retractable landing gear systems are there?
There are three main types of Retractable Landing Gear, Electrical, Hydraulic, and Manual.
How long does it take for landing gear to retract?
about seven seconds
Hydraulic pressure holds the gear up, so there are no uplocks as on some aircraft. The landing gear retracts or extends in about seven seconds.
Can landing gear retract on ground?
There is a weight sensor which senses if the plane is on the ground. This sensor prevents gear retraction while the plane is still on the ground. Failure of this sensor would prevent gear retraction after takeoff.
What type of fluid is used in the landing gear retraction system?
A hydraulic landing gear retraction system utilizes pressurized hydraulic fluid to actuate linkages to raise and lower the gear. When a switch in the flightdeck is moved to the UP position, hydraulic fluid is directed into the gear up line.
What are the two types of landing gear?
Landing gear usually comes in three basic wheel arrangements: conventional, tandem and tricycle-type. Beyond this, landing gear is then classified as either fixed or retractable. Fixed landing gear hangs underneath an aircraft during flight, whereas retractable landing gear is stowed inside an aircraft during flight.
How does the landing gear extension and retraction work?
Normal power for landing gear extension and retraction is supplied by two independant hydraulic sources: Hydraulic system No. 1 for the nose and body gear and system No. 4 for the wing gear. The alternate extension system uses electric motors to unlock the doors and landing gear.
Why did the Boeing 747 have 4 landing gears?
While the Boeing 747 was being designed in the 1960s, engineers were concerned about its heavy weight which could affect its ability to land safely. To counter this, they incorporated four main landing gears into the design, along with other features including triple-slotted flaps and split-control surfaces.
Where is the landing gear control module on a B 747?
B747 Landing Gear Control Module: Showing Handle and Control Rod (Credit: Boeing via AAIB) The handle is connected to a control rod, which in turn is connected to a quadrant, and attached to the quadrant is a cable that runs to the wing gear selector valve quadrant located in the right hand body gear wheel well.
Do all landing gear wheels have hydraulic brakes?
All the main landing gear wheels have hydraulic braking. The normal brake system is powered by the No. 4 hydraulic system, with system No. 1 as the alternate source. When utilizing system No. 1 as an alternate source, common tubing is utilized downstream of the normal brake source select valve.