Abstract: An online concierge system suggests replacement items when an ordered item may be unavailable. To promote similarity of sources between the replacement item with the ordered item, candidate replacement items are scored, in part, based on a source similarity score based on a source of the candidate replacement item and a source of the ordered item. The source similarity score may be determined by a computer model based on user interactions with item sources. The similarity score may be based on source embeddings that may be determined based on respective item embeddings or may be determined by training source embeddings directly from user-source interactions. The similarity score for a candidate replacement item may be combined with a replacement score indicating the user's likelihood of selecting the candidate replacement item as a replacement to yield a total score for selection as suggestion as a replacement for the ordered item.

Abstract: An antivibration centering ring for centering a foot of the torque tube of an aircraft brake on an axle of the aircraft includes alternating bearing zones that are arranged to bear in alternation on the axle and on the torque tube foot. The bearing zones are offset on their non-bearing sides by functional clearance so that no bearing zone bears simultaneously on the axle and on the foot of the torque tube. The bearing zones are connected to one another by flexible ligaments.

Abstract: A rear disc of a stack of aircraft carbon brake discs intended to rest against one end of the torque tube of the brake on which the disc stack is threaded, the support being provided by pucks secured to the rear disc by rivets, each inserted into a through hole in the rear disc and a hole opposite one of the pucks. According to the invention, each rivet has a cylindrical rod inserted into the holes of the rear disc and the puck and having an end deformed against the puck, and a head having a circular cylindrical portion with a conical base having an outer peripheral surface connected to a conical surface of the base by a fillet, and the disc through hole has a first portion adapted to receive the rod of the adjusting rivet, a second portion adapted to receive the circular cylindrical portion of the head of the adjusting rivet, and a transition conical portion adapted to receive the conical base of the rivet head.

Abstract: A rear disc of a stack of aircraft carbon brake discs intended to rest against one end of the torque tube of the brake on which the disc stack is threaded, the support being provided by means of pucks secured to the rear disc by rivets, each inserted into a through hole in the rear disc and a hole opposite one of the pucks. According to the invention, each rivet has a cylindrical rod inserted into the holes of the rear disc and the puck and having an end deformed against the puck, and a head having a circular cylindrical portion with a conical base having an outer peripheral surface connected to a conical surface of the base by a fillet, and the disc through hole has a first portion adapted to receive the rod of the adjusting rivet, a second portion adapted to receive the circular cylindrical portion of the head of the adjusting rivet, and a transition conical portion adapted to receive the conical base of the rivet head.

Abstract: An antivibration centering ring for centering a foot of the torque tube of an aircraft brake on an axle of the aircraft includes alternating bearing zones that are arranged to bear in alternation on the axle and on the torque tube foot. The bearing zones are offset on their non-bearing sides by functional clearance so that no bearing zone bears simultaneously on the axle and on the foot of the torque tube. The bearing zones are connected to one another by flexible ligaments.