Landing gear and brakes Flashcards
The landing gear is________ actuated and _________ operated.
electrically, hydraulically
Where is the landing gear emergency handle located?
Under the cockpit floor between the pilot seats.
What holds the landing gear in the up position?
An uplock box on each gear.
Explain the Emergency Extension process.
Pull out the free-fall handle that activates the free-fall selector valve and releases all residual hydraulic pressure from the landing gear lines to the return line, and mechanically releases the landing gear uplocks. Gravitational and aerodynamic forces extend the landing gear (the gear free fall). The downlock mechanism then locks the gear in its fully extended position.
When the flap lever is set to either 0, 1, or 2 position, when would the landing gear aural warning sound?
*Difference between pressure altitude and LFE is less than 700’, or radio
altimeter indication less than 700’ AGL; and
*Airspeed is below 160kts; and
*Either thrust lever is set below 40 degrees for two operative engines; and
*Thrust lever of operative engine is set below 40 degrees for a one-engine
inoperative condition.
When would the landing gear aural warning sound at flap lever 3 position or FULL?
Regardless of thrust lever position, airspeed and altitude, the landing gear aural warning will sound and cannot be silenced by pushing the WRN INHIB button.
When would the landing gear aural warning sound if flaps failed?
The landing gear aural warning will sound when the difference between pressure altitude and LFE is less than 700’ while descending.
What is the primary input to the Air/Ground System?
Weight-on-Wheels (WOW)
Name some of the aircraft systems that utilize the WOW signals:
Brake Control System
Landing Gear Control Lever
FADEC (Full Authority Digital Engine Control)
Electrical System
Lights (Baggage Compartment)
Air Conditioning and Pressurization
Fuel System (Fuel Indication)
Flight Controls (Flaps and Spoilers);
Avionics (Data Concentrator Unit and GEA (Garmin Engine/Airframe unit)
What is the minimum turning radius?
65 feet to make a 180 degree turn. Rudder pedals give up to 20 degrees of steering authority with another 23 degrees thru differential braking and thrust.
What would a “LG WOW SYS FAIL” CAS message indicate?
There is disagreement between the signals from right and left WOW sensors
for more than 3 seconds.
What type of brake system does the Phenom 300 utilize?
Carbon Brakes and Brake-by-Wire (Rudder pedals actuate the pedal transducers that send the brake inputs to the Brake control Unit (BCU)).
The brake system includes what functions:
1) Locked Wheel Protection – prevents the main landing gear tire from bursting.
(If a locked wheel condition is detected, where the wheel speed is 30% or less of the other wheel reference speed, a full pressure dump is applied to the locked wheel. The pressure dump is cancelled when the wheel speed or the “locked wheel” attains 70% of the paired wheel reference speed. The dropout speed for this functionality is 30kts, allowing differential braking for steering purposes).
2) Anti-Skid Protection – prevents tire skidding and maximizes brake efficiency
(The system controls the amount of hydraulic pressure applied to the brakes and reduces the wheel brake pressure, if necessary, to prevent skidding. The system provides antiskid protection when both wheel speed reference speeds are above 30kts. Below 10kts, anti-skid is deactivated, allowing the pilot to pivot on a wheel).
3) Touchdown Protection – prevents brake application prior to airplane on ground; allows the wheels to spin up at touchdown in order to avoid tire blow out, even if pedals are being pushed.
4) Gear Retract Braking – provides a brake pressure application during gear retraction to stop the rotating wheels before entering the wheel well.
5) Initiated Built In Test (IBIT) – it exercises the pressure loop components throughout their full range in order to ensure correct operation of the SOV, BCV, and PT.
What happens if the wheel speed input fails?
Anti-Skid is not available.
What would a “BRK FAIL” CAS message indicate during an approach?
Only the emergency/parking brake will be available for stopping.
(Actuating the T-Handle in the cockpit ports brake accumulator pressure to each brake assembly proportional to the amount the handle is pulled).
