SAE AIR1739B

1 SCOPE
    1.1 Purpose
2 APPLICABLE DOCUMENTS
    2.1 SAE Publications
    2.2 U.S. Government Publications
    2.3 Other Documents
3 GENERAL SYSTEM DESCRIPTION AND OPERATION
    3.1 General System Configuration
    3.2 System Operation
    3.3 Antiskid Control Classification
          3.3.1 ON-OFF System
          3.3.2 Modulating System (Quasi-Modulating)
          3.3.3 Adaptive Systems (Fully Modulating)
    3.4 Control Features
          3.4.1 Individual Wheel Control
          3.4.2 Paired Wheel Control
          3.4.3 Locked Wheel Protection
          3.4.4 Touchdown Protection
          3.4.5 Hydroplaning Protection
          3.4.6 Fault Detection
4 HARDWARE DETAILS AND FUNCTIONS
    4.1 Wheel Speed Transducer
          4.1.1 DC Generator
          4.1.2 AC Generator
          4.1.3 Fiber-Optic Wheel Speed Transducers
          4.1.4 Wheel Speed Transducer Couplings
    4.2 Controller
    4.3 Antiskid Valve
    4.4 Brake and Tire
5 SYSTEM PERFORMANCE EVALUATION
    5.1 Aircraft Tests
          5.1.1 Average Friction Coefficient Calculation -
                  Basic Method
          5.1.2 Average Friction Coefficient Calculation -
                  Alternate Method 1
          5.1.3 Average Friction Coefficient Calculation -
                  Alternate Method 2
          5.1.4 Average Friction Coefficient Calculation -
                  Alternate Method 3
          5.1.5 Antiskid System Efficiency Calculation - Drag
                  Force/Torque/Pressure Efficiency Method
          5.1.6 Antiskid System Efficiency Calculation -
                  Wheel Slip Method
    5.2 Simulator Tests
          5.2.1 Stopping Distance Efficiency
          5.2.2 Developed U Efficiency
          5.2.3 Developed U Efficiency - Alternate Method 1
    5.3 Dynamometer Tests
6 SYSTEM DEVELOPMENT PROCESS
7 SERVICE PROBLEMS
APPENDIX A BIBLIOGRAPHY
FIGURES
1 Antiskid System Schematic
2 On-Off System Operation
3 Modulating System Operation
4 Adaptive System Operation
5 DC Wheel Speed Transducer
6 AC Wheel Speed Transducer
7 Spider/Dog-bone Coupling
8 Bellows Coupling
9 Sensor - Exciter Ring
10 Antiskid Servo Valve
11 Typical Aircraft Brake Assemblies
12 Typical Aircraft Tire Construction (Bias)
13 Aircraft Landing Gear Geometry
14 Brake Torque/Pressure/Drag Force Efficiency
15 Antiskid Efficiency Versus Wheel Slip Ratio
16 Optimum Slip Ratio Determination
TABLE 1 Airplane and Landing Gear Parameters

This SAE Aerospace Information Report (AIR) has been prepared by a panel of the SAE A-5A Committee and is presented to document the design approaches and service experience from various applications of antiskid systems.