APPARATUSES FOR AN AIRCRAFT POWERPLANT

A rotating structure (70) for an aircraft powerplant (20) includes a balancing device (76) and a bladed rotor. The balancing device (76) is configured to rotationally balance the rotating structure (70) about a rotational axis (72). The balancing device (76) includes a housing (82) and a plurality of balancing masses (84). The housing (82) includes a first sidewall (94), a second sidewall (96), an outer endwall (98), an annular channel (102) and an annular slot (114). The outer endwall (98) circumscribes the annular channel (102). The annular channel (102) extends axially within the housing (82) between the first sidewall (94) and the second sidewall (96). The annular slot (114) extends radially through the outer endwall (98) to the annular channel (102). Each of the balancing masses (84) includes a mass body (130) and an engagement feature (134). The mass body (130) is captured within the annular channel (102). The engagement feature (134) is configured to be engaged by a tool (162) from outside of the housing (82) to adjust a circumferential position of the mass body (130) about the rotational axis (72).