AMS 5 - 3Brakes

AMS 5 - 3Brakes

AMS 5 Part 3

AMS 5.6 Describe the construction, operation, function, inspection and maintenance of an aircraft braking system.

AMS 5.7 From given information, describe the function of components and principles of operation of the following systems:

           Nose wheel steering;

           Power wheel brakes, and

           Anti-skid braking systems.

AMS 5.8 Describe a typical brake temperature monitoring system and be able to use a brake limitation chart.

Drum BrakeDrum Brake

Non-Energising BrakesNon-Energising Brakes

Expander Tube ConstructionExpander Tube Construction

Single Disk BrakesSingle Disk Brakes

Keyed

Single Disk BrakesSingle Disk Brakes

Bolted

Multiple Disk BrakeMultiple Disk Brake

Segmented Rotor BrakeSegmented Rotor Brake

Automatic AdjustersAutomatic Adjusters

Single Disk

Automatic AdjustersAutomatic Adjusters

Multi Disk

Master CylindersMaster Cylinders

Released

Pressure applied

Independent Master CylinderIndependent Master Cylinder

Brake ValveBrake ValvePressure Boosted

BrakesPressure Boosted

Brakes

Parking Brake ValveParking Brake Valve

2 Position Type SAAB 3402 Position Type SAAB 340

Rotary Park Brake ValveRotary Park Brake Valve

Sikorsky, Blackhawk/Seahawk HelicoptersSikorsky, Blackhawk/Seahawk Helicopters

Brake SystemsBrake Systems

Light aircraft / Wheeled HelicoptersLight aircraft / Wheeled Helicopters

Reservoir

Brake Pedals Parking Brake Handle

Parking Brake Control Valve

Brake Master Cylinder (1 of 4)

Shuttle Valves

Non Powered Hydraulic Brake SystemsNon Powered Hydraulic Brake Systems

Sikorsky, Blackhawk/Seahawk HelicoptersSikorsky, Blackhawk/Seahawk Helicopters

Powered Hydraulic Brake SystemsPowered Hydraulic Brake Systems

LEFT

BRAKES

Power Brake Control ValvePower Brake Control ValveSliding SpoolSliding Spool

Brake Debooster CylinderBrake Debooster Cylinder1. Emergency system pressure line2. Main brake pressure line3. Upper support clamp4. Packing5. Packing6. Debooster cylinder assembly7. Piston8. Piston Spring9. Packing10. Lower support clamp11. Riser tube12. Packing13. Tee Fitting14. Brake line (to pressure relief valve)15. Brake pressure relief valve16. Overflow line17. Brake line (Debooster to shuttle valve)18. Shock strut19. Torque link20. Brake shuttle valve21. Upper end cap22. Snap ring23. Spring retainer24. Valve Spring25. Ball26. Ball pedestal27. Barrel28. Lower end cap

Brake Debooster CylinderBrake Debooster Cylinder

F = A P1500 psi 2 sq. in= 300 psi 10 sq. in

Deboost and Lockout ValveDeboost and Lockout Valve

Anti Skid SystemsAnti Skid Systems

TransducersTransducers

Electro Hydraulic Anti Skid ValveElectro Hydraulic Anti Skid Valve

Anti Skid SystemAnti Skid System

Medium to large aircraftMedium to large aircraft

Zone Description Requirements

Zone I Normal zoneBelow 1 .0 Million ft.lb [138 000 kg m]

No special requirement under normal operations.

Zone II Normal zone1.0 to 2.05 million ft.lb [138 000 to 282 900 kg m]

Delay subsequent take off as indicated by chart

Zone III Caution zone:

2.05 to 4.0 million ft.lb [282 900 to 552 000 kg m]

1. Move aircraft to clear active runway as uneven braking could cause one or more tyres to deflate if energy was in the upper range.

2. Use brakes sparingly to manoeuvre.3. Do not set parking brake.4. Allow to cool for the time indicated by chart.5. After cooling, make a visual check of brakes.

Zone IV. Danger zone Over 4.0 million ft.lb [552 000 kg m]

I. Clear runway immediately as fusible plugs will blow 2 to 30 min. after stopping.

2. Do not apply dry chemical or quench until fusible plugs have released tyre pressure.

3. Do not approach for 1/2 hour or until fusible plugs have blown.

4. Two to three hours are required for brakes to cool enough for safe removal when artificial cooling is not used.

5. Tyres, wheels, and brakes must be replaced.