Lesson 13: BREAKS & SKIDS Flashcards
What are the 2 types of brakes?
Cleveland
Goodyear
Describe a CLEVELAND brake
RIGID disc
FLOATING caliper
Describe a GOODYEAR brake
FLOATING disc
RIGID caliper
This brake uses multiple small PISTONS to force a pressure plate against a disc stack thus applying a clamping force
MULTIPLE DISC BRAKE
What are discs commonly made of?
Steel
Carbon
This type of brake is used for large aircraft and is made up of a stationary housing, pressure plate, backing plate
MULTI DISC BRAKE
What are the advantages of CARBON discs?
thicker/lighter
better wear/heat dissipation
What type of brake contains a REDUCTION GEAR?
Electro-mechanical carbon brake
What are the 4 types of brake actuators?
Independent Master Cylinder
Boosted
Power
Emergency
This type of brake system is primarily used on small aircraft, and secondary on large. It also contains a DIAPHRAGM
INDEPENDENT MASTER CYLINDER
On what type of aircraft do we use boosted brakes?
MIDSIZE
This type of brake system uses foot pressure and the hydraulic system
BOOSTED BRAKE
How does a BOOSTED brake work?
Depressing the pedal pulls ROD and forces fluid to brakes
More pressure more fluid provided by SPOOL valve
This type of brake uses the main hydraulic system pressure for large aircraft application
POWER brakes
Power brakes incorporate which subsystems?
DEBOOSTING
ANTISKID
EMERGENCY BRAKE
What is DEBOOSTING?
Pressure reducer for effective brake control
What is ANTISKID?
Prevents individual wheel skids
What do we use fro EMERGENCY brakes?
CO2
Brake accumulators
What are the 2 primary inspections done on a small aircraft brake?
Brake wear
Hydraulic leak
How is break wear determined?
Length of brake return PIN
Thickness of disc/pad
How do we perform brake wear check on large aircraft?
With brakes ON
Air in the system or brake line deterioration can cause what?
Spongy brakes
What are the 2 ways of bleeding the brakes not equipped with power brakes?
Gravity and pressure
A locked wheel can cause what?
tire wear
rupture
slip
Antiskid systems are designed to send what if the wheel decelerates too rapidly?
Brake release order
What does a BRAKE RELEASE ORDER do?
Sends fluid back to return, bypassing the brake
What are the 3 components of the ANTISKID system?
Wheel Speed sensors
Control valves
Antskid computer
3 main functions of the control unit?
- electrical signal used by control valve
- regulate brake pressure
- prevents brakes applied before touchdown
When is the antiskid system fully active?
20mph+
