TM 1-6625-724-13&P0003 000003 00-1TECHNICAL PRINCIPLES OF OPERATIONAVIATION VIBRATION ANALYZERFiguresFigure 1. AVA Overall Menu Structure ............................................................................................................................2PRINCIPLES OF OPERATIONThe AVA system maintains a database of measured data, diagnostic outputs, and aircraft history. The system willgenerate printed reports from this database to support historical review and trending of data. All or part of thedatabase may be deleted, transferred to an external computer, or restored from a computer. Transfer isaccomplished by means of an RS-232 link using KERMIT protocol, or a solid-state memory unit the size of a creditcard. Diagnostic programs and replacement software modules are transferable by the same means.The primary mission of the AVA is to collect helicopter blade track height, blade lead/lag, vertical/lateral vibrationmeasurements, shaft vibration, and to calculate the recommended maintenance correction to the rotor system that willresult in reduced vibration levels. This system may also be used for engine vibration analysis.The actual measurements are carried out automatically and simultaneously by a single operator keystroke. The AVAexecutes configured, internally stored software programs limited to the established aircraft maintenance proceduresthat reduce vibration levels. User interface is needed for entry of aircraft identification, single key commands for datacollection, results display, and computed maintenance corrections.Each of the AVA functions provides an overview style of direction to the operator in the form of a main diagram. Thediagram contains all of the elements and options that the operator can invoke along with a general description of whatto do in making the desired selections.Figure 1 shows the four main functions performed by the AVA and the basic elements associated within eachfunction.
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