TM 1-6625-724-13&P0011 000011 00-1SYSTEM DIAGNOSTICSAVIATION VIBRATION ANALYZERFiguresFigure 1. Diagnostic Menu Hierarchy ............................................................................................................................... 2Figure 2. Edit Adjustables Screen .................................................................................................................................... 4DIAGNOSTICSThe Diagnostics function executes the diagnostics routine on the selected Flight Plan's data. The diagnostics routinewill typically calculate the required mass balance, pitch rod and tab adjustments necessary to reduce system vibrationand track to acceptable levels.The Diagnostic operation is started by pressing the F3 key from the Main Menu, see figure 1. The aircraft setup scriptmust have been previously configured with diagnostic coefficients and weighting factors for the diagnostics tofunction. (Weighting factors can be described as a set of “priorities” for the diagnostics to consider. Certain vibrationor track data points can be weighted to have more priority than others in the diagnostics.) The diagnostic operation isexecuted on data from the currently selected flight ID. These corrections are the optimum set of adjustments thatshall be made to reduce the vibration levels to the lowest possible level (all indicated corrections must be made). If areduced or modified set of adjustments is required or desired, the diagnostic editing functions (Edit Adjustables or EditDefaults) must be used.a.ViewingtheCorrectionsUpon pressing the F3 key at the Main Menu, the first screen will be a comparison of the vibration and/or track splitmeasurements as compared against the limits defined by the script file. If multiple pages exist, the LEFT andRIGHT arrow keys can be used to scroll through the displays. Pressing the UP and DOWN arrow keys will togglefrom the default of displaying only “above limits” values to displaying all values as compared to their defined limits.Pressing QUIT or DO will instruct the system to exit out of the limits page and continue with the diagnosticsroutine.NOTEIf “All Measurements are Within Specified Limits” isdisplayed, pressing QUIT will return the system to theMain Menu, while pressing DO will instruct the system tocontinue with the processing and diagnosis of theremaining vibration and track values.The second screen (optional, dependent on script file configuration) is a display of the system’s current record ofabsolute adjustment values. In the case of a new aircraft being measured for the first time with this system, allvalues will be zero. In all other cases, the display shows a cumulative record of the adjustments alreadyperformed. This display is interactive and provides the operator the ability to enter any information already knownabout the rotor configuration for the system to consider while calculating corrections. Pressing DO will continuethe diagnostics calculation with any manual changes entered. Pressing QUIT will continue without the changesbeing saved.The Diagnostics operation will display a corrections screen indicating the desired corrections. To scroll throughthe corrections list, use the LEFT and RIGHT arrow keys on the CADU keypad. To print the entire screen, pressthe PRINT key. Pressing the DO key will advance to the Diagnostics Menu screen.b.Viewing the Predicted ResponseThe Predicted Response, assuming the corrections indicated in the corrections screen are fully implemented, isdisplayed on the Predicted Response screen. This screen can be viewed by selecting the view prediction optionsfrom the Diagnostics Menu. The Predicted Response screen shows a table of predicted responses for thevarious vibration and track measurements at each test condition. For instance, data was collected at a testcondition called FPG100, the predicted amplitude and phase of the vibration and the predicted track in mm aredisplayed. If additional Test States were performed there, predicted vibration and track levels would also bedisplayed. The predicted response is useful for a couple of reasons. It allows a user to use the diagnostic editorto eliminate a particular adjustment or families of adjustments and view the predicted response. This makes itpossible to select a limited set of adjustments that still meet a user's vibration criteria that potentially can savework and time. The second useful aspect is to monitor the effectiveness of the diagnostic solution. The predicted
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