Present day airliners coming into land weigh some 100 tons and in certain case vey much more. No matter how skilful the landing, the loading on the under-carriage gear is very considerable, commencing with the initial shock and the application from zero to full loading in less than half a second, quite apart from braking stresses.
As in all highly stressed equipment, correct design and the careful choice of materials are the safeguards to unfailing reliability. For the bushes used in aircraft under carriages, Langley HIDURAX 1 is particularly suitable. Because of the heavy loads involved most conventional bearings Bronzes are inadequate due to their low strength.