Figure 7-38.  Positions of two-bladed propeller during a balance check.  Figure 7-39.  Positions of three-bladed propeller during balance check. During a propeller static balance check, all blades must be at  the same blade angle. Before conducting the balance check,  inspect to see that each blade has been set at the same blade  angle. Unless otherwise specified by the manufacturer, an  acceptable balance check requires that the propeller assembly  have no tendency to rotate in any of the positions previously  described. If the propeller balances perfectly in all described  positions, it should also balance perfectly in all intermediate  positions. When necessary, check for balance in intermediate  positions to verify the check in the originally described  positions.  [Figure 7-40] When a propeller assembly is checked for static balance and  there is a definite tendency of the assembly to rotate, certain  corrections to remove the unbalance are allowed. The location for removal or addition of weight for propeller  unbalance correction has been determined by the propeller  1.  The addition of permanent fixed weights at acceptable  locations when the total weight of the propeller  assembly or parts is under the allowable limit. 2.  The removal of weight at acceptable locations when  the total weight of the propeller assembly or parts is  equal to the allowable limit. 7-25 A. Vertical balance check B. Horizontal balance check 1 3 2 3 2 1 2 1 3