9.2 Duration of accelerated vibration tests All categories of equipment shall be subjected to a total conditioning time of 15 h. This shall normally be divided into periods of 5 h conditioning in each of three mutually perpendicular axes. If during the course of testing overheating of equipment is felt to be a problem, (i.e. vibration of rubber parts, etc.) it is permissible to stop the tests for a period of time in order to allow the equipment to recover. However, it must be noted that the total duration of 5 h vibration shall be achieved. If tests are stopped then this shall be stated in the report.