21.A.128 Tests: engines, propellers, and control and monitoring units (CMUs)

Each manufacturer of engines, propellers or CMUs manufactured under this Subpart shall subject each engine, variable pitch propeller, or CMU to an acceptable functional test as specified in the type-certificate holder’s documentation, to determine whether it operates properly throughout the range of operation for which it is type certified, as a means of establishing relevant aspects of compliance with point 21.A.125A(a).