This Minimum Performance Document defines the testing required for wheels, brakes, and wheel and brake assemblies to be used on civil aircraft certified under 14 Code of Federal Regulations (CFR) Part 23, 27, and 29.

Compliance with this document is recommended to assure that the equipment supplied will meet the intended design function when installed on aircraft. Compliance with this document does not constitute authorization for installation on an aircraft. The combined recommendations of this document provide an acceptable practice, but not the only practice, for obtaining authorization to apply TSO markings on the equipment.

Applications:

Compliance with these minimum performance requirements by manufacturers is required as a means of assuring that the equipment will have the capability to satisfactorily perform its intended function(s). Installers and users must properly maintain this equipment to assure its continued safe operation.

NOTE: Aircraft operational characteristics and other external influences may affect performance capabilities. Consequently, anticipated aircraft braking performance should be verified by aircraft testing.

Composition of Equipment:

The words “equipment” or “brake assembly” or “wheel assembly” as used in this document include all components which form the entire unit.

For example, a wheel assembly may include half hub(s), bearings, flange(s), drive keys, heat shields, brake disks, and fuse plugs. A brake assembly may include backing plate, torque tube, cylinder assemblies, pressure plate, and heat sink.

It should not be inferred from this example that each wheel assembly and brake assembly will necessarily include all or only, the above example components. This will depend on the specific design chosen by the manufacturer.