The acceleration stress test of the brake system on an airplane

The test method is discussed which increases the environment stress and the working stress to stimulate failures in products without damage, besides, the method which converts the acceleration stress test time to working time is put forward to evaluate the MTBF and first overhaul period of the product. In order to stimulate potential failures, the technology of colligating reliability test and life test is studied in the brake system of a certain aircraft, in which the environment stress is not statistical stress but its kind and magnitude are established in allusion to the weak links. Rated working stress which corresponds to antiskid brake rule is brought into the test profile and the contamination tolerance test of hydraulic system is conducted. As a result, latent failures of the break system are activated in a short time; the test which needs 5200 working hours to finish is ended in 200 hours; reliability growth rate achieves 0.65; the MTBF of the brake system increases to 848h from 28h in the beginning, and the first overhaul period of new developed products in the break system attains 1250 takeoff-landing times.