Document ID: chunk:federal_register_of_legislation:F2007C00493:front:0:p18
Version: federal_register_of_legislation:F2007C00493
Segment Type: other
Provision Reference: 
Character Range: 50556–53639

at that Actuator Supply Energy level when tested in accordance with clause 22.3.1. The chosen, nominated energy level of the signal provided to the 'Brakes' actuator, must not be less than that necessary to produce a calculated 'Established Retardation Coefficient' of 0.45 under the Service Brake test Conditions described in part 11 when laden to the 'GALR' without prior fade conditioning stops.
22.3.6.1.                    The final speed to which the trailer has to be successively braked as part of the brake fade conditioning procedure must be determined from the equation

V12 - V22 = 2,700    'Gross Axle Load Rating'
                      'Total Combination Mass'

         where:

         V 1 is the initial speed in km/h
         V 2 is the final speed in km/h
         Masses and Loads in tonnes
22.3.6.2.                    The temperature (100 °C) requirement of clause 10.3 does not apply to the test required by clause 13.1.
22.4.                                Suspension Behaviour, 'Brake Reactive Suspensions' only.
22.4.1.                          'Suspension Systems' for other than hinged drawbar 'Pig Trailers'.
22.4.1.1.                    The suspension must be installed according to the 'Manufacturer's' instructions to a representative trailer, be fitted with 'Axles', wheels and tyres of a size appropriate to the mass rating of the suspension, and be fitted with identical "Pre-calibrated" 'Brakes' at each 'Axle'.
22.4.1.1.1.              "Pre-calibrated" in this case means that the relationship between the input actuation energy level and the output torque for the 'Brakes' on each 'Axle' has been measured.
22.4.1.2.                    To determine the 'Service Brake System' 'Skid Limit' a Service Brake Effectiveness Test must be conducted applying the brakes on all 'Axles' of the trailer and using the General Test Conditions of part 10 and generally in accordance with the particular conditions of part 11 with not less than 50% of the 'Suspension Systems' rated 'Axle Group' load used in place of 'Gross Trailer Mass'.   Clause 11.2 need not be complied with.
22.4.1.3.                    The test result must be reported as the value of the computed retardation force for each 'Axle' divided by the greatest of the 'Axle' retardation forces at which an 'Established Retardation Coefficient' of 0.45 can be achieved without wheel lock.
22.4.1.3.1.              In the case of 'S-Cam' air 'Brake Systems' the overall effect of changing actuator and slack adjuster sizes can be simulated by individually adjusting the air pressure to each 'Axle'.
22.4.1.4.                    To determine the 'Emergency Brake System' 'Skid Limit' a test repeating that prescribed in clause 22.4.1.2 must be conducted, but using brakes on those trailer axles deemed to be fitted with an 'Emergency Brake System' and without having to meet 0.45 'ERC'. The 'Skid Limit' value must be specified as the dimensionless ratio D

Where D =   Indicated retardation force (N)
            9.81  Static 'Axle Load'

         Where D is the maximum value achievable