33 Questions
What is the primary concern when bleeding power brakes in an aircraft?
Following the applicable maintenance manual in detail
What is the purpose of a steering system in an aircraft?
To control the direction of movement while taxiing
What type of fluid is commonly used in an aircraft's hydraulic system?
All of the above
What type of steering system is typically found on small aircraft?
Mechanical steering system
What is the purpose of bleeding the power brake system?
To remove air from the hydraulic system
What is a common component found in power brake systems that requires special consideration during bleeding?
Anti-skid component
What is the purpose of the master cylinder in a power brake system?
To amplify the pressure of the brake pedal
What is the most popular brake for modern light aircraft?
Single Disc Brake
What is the function of the calliper in a single disc brake?
To apply a squeezing action between the fixed linings and the rotating disc
What type of brake has the disc keyed into the wheel and free to move in and out as the brake is applied?
Single Disc Brake with a keyed disc
What is the purpose of the disc clips in a single disc brake?
To prevent the disc from rattling
What forces the brake piston onto the movable lining and against the disc in a single disc brake?
Hydraulic fluid under pressure
What is the function of the anchor bolts in a single disc brake?
To move the calliper in and out
What is the purpose of the hardened steel drive keys in a single disc brake?
To rotate the disc with the wheel
In a single disc brake, where is one of the linings fixed?
In the outer portion of the housing
What happens to the tail wheel when the aircraft is turning during taxiing?
It deflects in the direction of the turn
What is the purpose of the lines painted on the underside of the nose of the aircraft?
To show the maximum towing pivot angle
What is the purpose of the auto brake control valve in the auto-braking process?
To open and allow pressure from the No. 2 system to operate the shuttle valves
What type of spring is used to centre the nose wheel on the MB-326H Macchi aircraft?
Tension spring
What happens to the wheels spinning after the landing gear is selected up?
They are stopped by the pressure from the No. 2 system operating the shuttle valves
What happens to the aircraft when the left brake is applied during taxiing?
The aircraft turns in the direction of the arrow
Which system provides pressure to operate the shuttle valves during auto-braking?
No. 2 system
What is the purpose of the parking brake valve in the auto-braking process?
To apply pressure from the landing gear up line to the auto brake control valve
What is the primary purpose of the nose wheel on tricycle configurations?
To deflect left or right during turns
What initiates the auto-braking process after take-off?
Landing gear up selection
What is used to centre the nose wheel on tricycle configurations after a turn?
Cam centring devices
What type of braking system is used during taxiing in the figure shown?
Differential braking
What is the function of the shuttle valves in the auto-braking process?
To operate the brake units and stop the wheels spinning
What happens to the tail wheel when the aircraft returns to straight line taxiing?
It re-engages and centres itself
What is the primary function of the brake units in the auto-braking process?
To stop the wheels spinning after take-off
Which system is not directly involved in the auto-braking process?
Flaps system
What is the result of the pressure from the No. 2 system operating the shuttle valves?
The wheels are stopped after take-off
What is the purpose of the pressure from the landing gear up line in the auto-braking process?
To apply pressure to the parking brake valve
Study Notes
Aircraft Steering and Braking
- Aircraft use differential braking while tail steering is disengaged, and the tail wheel re-engages when the aircraft returns to straight-line taxiing.
- Applying the left or right brake forces the castoring type nose wheel to deflect left or right on tricycle configurations.
- Nose wheel aircraft use spring or cam centring devices to centre the lower fork after the aircraft has been turned.
Brake Types
- Single disc brakes are the most popular type of brake for modern light aircraft, with a calliper that applies a squeezing action between fixed linings and a rotating disc.
- There are two types of single disc brakes: one with the disc keyed into the wheel and free to move in and out, and another with the disc rigidly attached to the wheel and the calliper moving in and out on anchor bolts.
Brake Components
- The disc rotates between two linings and is clamped when hydraulic fluid under pressure forces the brake piston onto the movable lining and against the disc.
- The housing is bolted to the axle and holds the two linings, one fixed in a recess in the outer portion of the housing, and the other riding in the inner side.
Auto-Braking System
- The auto-braking system applies pressure to the parking brake valve, which opens to allow pressure from the No. 2 system to operate the shuttle valves and direct pressure to the brake units to stop the wheels spinning.
Bleeding the Brake System
- It is essential to follow the maintenance manual in detail when bleeding power brakes, as there may be anti-skid components, de-boosters, or hydraulic fuses in the lines that must be given special consideration.
- The bleeding procedure is not complete until both the main and emergency systems are free of air.
Hydraulic Fluid
- The hydraulic system of a modern aircraft may use phosphate-ester-base synthetic fluid such as Skydrol, mineral-base MIL-H-5606, or synthetic MIL-H-83282A fluid.
This quiz assesses your understanding of aircraft taxiing and braking procedures, including differential braking and tail wheel re-engagement.
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