Radially captured in situ balancing masses for aircraft powerplant

An apparatus for an aircraft powerplant, comprising:

• a rotating structure including a balancing device and a bladed rotor, the balancing device configured to rotationally balance the rotating structure about a rotational axis, and the balancing device including a housing and a plurality of balancing masses;
• the housing including a first sidewall, a second sidewall, an outer endwall, a mount, an annular channel and an annular slot, the first sidewall and the second sidewall each projecting radially out away from the rotational axis to the outer endwall, the outer endwall circumscribing the mount, the mount including a plurality of mounting apertures arranged circumferentially about the rotational axis, the annular channel extending axially within the housing between the first sidewall and the second sidewall, the annular channel extending radially within the housing between the outer endwall and the mount, and the annular slot extending radially through the outer endwall to the annular channel;
• and
• each of the plurality of balancing masses including a mass body, an engagement feature and a shank, each mass body captured within the annular channel, each engagement feature axially aligned with the annular slot, and each shank threaded into a respective one of the plurality of mounting apertures.

An apparatus for an aircraft powerplant, comprising:

• a rotating structure including a balancing device and a bladed rotor, the balancing device configured to rotationally balance the rotating structure about a rotational axis, and the balancing device including a housing and a plurality of balancing masses;
• the housing including a first sidewall, a second sidewall, an outer endwall, a bushing, an annular channel and an annular slot, the first sidewall and the second sidewall each projecting radially out away from the rotational axis to the outer endwall, the outer endwall circumscribing the bushing, the annular channel extending axially within the housing between the first sidewall and the second sidewall, the annular channel extending radially within the housing between the outer endwall and the bushing, and the annular slot extending radially through the outer endwall to the annular channel;
• and
• each of the plurality of balancing masses including a lug, a spring element and a pin with a shoulder, each lug disposed within the annular channel and circumferentially slidable along the bushing, and each spring element compressed between the respective lug and the respective shoulder.