Friction and wear coefficients can vary a lot in multi-disk aircraft brakes under the condition of loaded friction regimes. That is why heat loading, friction duration and distance and also service life calculation procedures, based on constant friction and wear coefficients, are not always applicable to such devices. Such a calculation can provide sufficiently valid results only if experimental data are available, obtained by testing friction couples in a full-scale brake on a test bench. The results will be reliable if a full-scale brake structure is similar to a new one, which is under design, the same friction couple is used and brakes operation modes do not differ too much. It is also possible to use the results of friction couples specimens braking tests, in case the test procedure is based on friction and wear modelling theory recommendations.

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