GM No 2 to 21.A.128 Acceptable functional test - Variable pitch propellers

• ED Decision 2012/020/R found in: Initial Airworthiness and Environmental Protection (748/2012) Part-21 Part-21L (Jul 2024)

GM No 2 to 21.A.128 Acceptable functional test – Variable pitch propellers ED Decision 2012/020/R The functional tests required for a new propeller will be specified by the propeller design organisation and should normally include a number of complete cycles of control throughout the propeller pitch and rotational speed ranges. In addition, for feathering and/or reversing propellers, several cycles of feathering operation and reversing operation from the lowest normal pitch to the maximum reverse pitch, should normally be required. ##### GM No 2 to 21.A.128 Acceptable functional test – Variable pitch propellers *ED Decision 2012/020/R* The functional tests required for a new propeller will be specified by the propeller design organisation and should normally include a number of complete cycles of control throughout the propeller pitch and rotational speed ranges. In addition, for feathering and/or reversing propellers, several cycles of feathering operation and reversing operation from the lowest normal pitch to the maximum reverse pitch, should normally be required.