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The design of jet engine parts makes particular claims on the balancing machines used: shortest spinning time in the balancing machine, e.g. no nulling and calibration runs—set up of the plane computer at stand still—exact plane setting even at close compensation plane distances and large bearing plane space—installation of rotors with their own operational ball or roller bearings without necessity of the parasitic mass of connection frames or squares.

This is our report on this first international assembly of Aircraft Maintenance and Engineering, held in Zurich 6th–9th February 1979. This was AIRMEC 79 — and, as was foreseen in our Comment in the January issue, the significance of this innovation among aviation occasions was taken up by thirty‐six countries who sent 276 delegates to the convention, which was supported by the Exhibition, attracting 112 exhibitors from 17 countries. There is every chance that this event will take its place with Farnborough, Paris and Cranfield as a regular feature of the aviation scene and of considerable interest to all engaged in aircraft maintenance. The organisers did announce at the end of that Show that AIRMEC 81 would take place, again in Zurich, in February of that year. And perhaps it is interesting to comment at this stage about the decision to return to Zurich. While it might be said that the event was a success, the fact that the convention was held in a venue separate from the Exhibition, did have some disadvantages and the consensus among the exhibitors was that this did discourage many of the 2260 in attendance from really taking in the Exhibition. Perhaps the only exception to this were the Chinese whose delegation spent almost all of every day in the Exhibition halls, visiting every stand and spending considerable time at each one.