0071 00TM 1-6625-724-13&P0071 00-34TASK 4 –BALANCE TAIL ROTOR NOTEAVA moves are changes to the adjustable tip weightsand, as such, are to be added to or subtracted fromwhatever weights are currently in the blade tips.NOTEThe diagnostic solution given for each set ofmeasurements is independent of all othermeasurements that have been previously performed.The AVA does not maintain any history of adjustments.It therefore makes no assumptions regarding whatadjustments were made during previous runs. a. Examine the Limits screen. If measurements are within limits, press the UP cursor to display the measuredmagnitude. If tail rotor balance is above 0.10 ips and it is desired to reduce it further, press QUIT to return to thefirst limits screen, then continue with this procedure (do step b). If it is not desired to reduce balance to below0.10 ips, press QUIT to terminate tail rotor balance procedures.b. Press DO to calculate the adjustment.NOTEThe total weight move called for by the AVA for a givenblade should be equally split between the forward andaft weight pockets, with 1/2 the weight adjustment madeto the forward pocket and 1/2 the weight adjustmentmade to the aft pocket. NOTEThe addition of weight to a blade has the equivalenteffect on vibration as removal of the same amount ofweight from its opposite blade.NOTEA weight change to an outboard blade is 50% moreeffective than an equal weight change to an inboardblade.c. Recall the measured balance:1. If the measurement is less than 0.7 ips, record and make the AVA-recommended adjustments. Do procedure6.2. If the measurement is 0.7 ips or greater, Do procedure 5.1.PROCEDURE 5.1 Tail Balance 0.70 ipsa. For balance greater than or equal to 0.7 ips, reduce the AVA-recommended adjustments by 1/2 for both inboardand outboard blades. This will prevent adjustment overshooting for high imbalance.b. Perform procedure 6.PROCEDURE 6: VERIFY/REPEATRepeat tail measurement to determine whether or not the corrections had the desired affect. Repeat diagnostics/corrections as necessary until vibration is within limits.
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