A lubricant pump system (20; 120; 220) for an aircraft engine, the lubricant pump system (20; 120; 220) comprising: a source of motive power (30; 238); a first lubricant pump (26; 126A, 128A; 226A, 228A) drivingly connected to the source of motive power (30; 238) via a first load path (32A; 132A; 232A) receiving a first portion of the motive power; a second lubricant pump (28; 128B, 126B; 228B, 226B) drivingly connected to the source of motive power (30; 238) via a second load path (32B; 132B; 232B) receiving a second portion of the motive power, the second load path (32B; 132B; 232B) being separate from the first load path (32A; 132A; 232A); and a mechanical fuse (34; 134; 234) operatively disposed between the source of motive power (30; 238) and the first load path (32A; 123A; 232A), the mechanical fuse (34; 134; 234) also being operatively disposed between the source of motive power and the second load path (32B; 132B; 232B), characterised in that: the source of motive power (30; 238) includes a drive gear, the first load path includes a first shaft drivingly connected to the drive gear via the mechanical fuse, and the second load path includes a second shaft drivingly connected to the drive gear via the mechanical fuse; and the lubricant pump system comprises a coupler drivingly interconnecting the first shaft and the second shaft together, the coupler being drivingly connected to the drive gear via the mechanical fuse. a source of motive power (30; 238); a first lubricant pump (26; 126A, 128A; 226A, 228A) drivingly connected to the source of motive power (30; 238) via a first load path (32A; 132A; 232A) receiving a first portion of the motive power; a second lubricant pump (28; 128B, 126B; 228B, 226B) drivingly connected to the source of motive power (30; 238) via a second load path (32B; 132B; 232B) receiving a second portion of the motive power, the second load path (32B; 132B; 232B) being separate from the first load path (32A; 132A; 232A); and a mechanical fuse (34; 134; 234) operatively disposed between the source of motive power (30; 238) and the first load path (32A; 123A; 232A), the mechanical fuse (34; 134; 234) also being operatively disposed between the source of motive power and the second load path (32B; 132B; 232B), characterised in that: the source of motive power (30; 238) includes a drive gear, the first load path includes a first shaft drivingly connected to the drive gear via the mechanical fuse, and the second load path includes a second shaft drivingly connected to the drive gear via the mechanical fuse; and the lubricant pump system comprises a coupler drivingly interconnecting the first shaft and the second shaft together, the coupler being drivingly connected to the drive gear via the mechanical fuse. the source of motive power (30; 238) includes a drive gear, the first load path includes a first shaft drivingly connected to the drive gear via the mechanical fuse, and the second load path includes a second shaft drivingly connected to the drive gear via the mechanical fuse; and the lubricant pump system comprises a coupler drivingly interconnecting the first shaft and the second shaft together, the coupler being drivingly connected to the drive gear via the mechanical fuse.