BRAKES Flashcards
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).
Is Anti-Skid available for the emergency/parking brake?
No.
How many applications does the emergency/parking brake provide?
Six
