A system comprising: an in-line turboprop engine having a central axis of rotation defining an axial direction and including a compressor coupled to a compressor shaft that is rotatable about the central axis of rotation, a lubricant supply, an exhaust manifold and an air intake manifold disposed axially aft of the exhaust manifold; auxiliary accessories (27, 28) disposed at an aft end of the in-line turboprop engine; and a lubrication assembly for the auxiliary accessories (27, 28), the lubrication assembly comprising: an accessory gearbox including a forward wall extending transversely with respect to the axial direction, an aft wall spaced apart from the forward wall in the axial direction and disposed aft of the forward wall, and at least a first sidewall extending in the axial direction and connecting the forward wall to the aft wall, the forward wall of the accessory gearbox at least partially defining the air intake manifold of the engine; a plurality of rotatable shafts (271, 281, 34) that are extending along the axial direction through the aft wall of the accessory gearbox, each respective rotatable shaft being disposed to be connected to drive a respective one of the auxiliary accessories of the engine; gearing (36, 38) disposed within the accessory gearbox and connected to the shafts; and a lubricant reservoir for containing lubricant for the accessory gearbox, the lubricant reservoir being configured to be connected to be supplied with lubricant from the lubricant supply of the engine, the lubricant reservoir being defined in part by the first sidewall of the accessory gearbox, the first sidewall being disposed to separate the lubricant reservoir from the accessory gearbox, and wherein the lubricant reservoir defines an aft chamber projecting axially aft beyond the aft wall of the accessory gearbox. an in-line turboprop engine having a central axis of rotation defining an axial direction and including a compressor coupled to a compressor shaft that is rotatable about the central axis of rotation, a lubricant supply, an exhaust manifold and an air intake manifold disposed axially aft of the exhaust manifold; auxiliary accessories (27, 28) disposed at an aft end of the in-line turboprop engine; and a lubrication assembly for the auxiliary accessories (27, 28), the lubrication assembly comprising: an accessory gearbox including a forward wall extending transversely with respect to the axial direction, an aft wall spaced apart from the forward wall in the axial direction and disposed aft of the forward wall, and at least a first sidewall extending in the axial direction and connecting the forward wall to the aft wall, the forward wall of the accessory gearbox at least partially defining the air intake manifold of the engine; a plurality of rotatable shafts (271, 281, 34) that are extending along the axial direction through the aft wall of the accessory gearbox, each respective rotatable shaft being disposed to be connected to drive a respective one of the auxiliary accessories of the engine; gearing (36, 38) disposed within the accessory gearbox and connected to the shafts; and a lubricant reservoir for containing lubricant for the accessory gearbox, the lubricant reservoir being configured to be connected to be supplied with lubricant from the lubricant supply of the engine, the lubricant reservoir being defined in part by the first sidewall of the accessory gearbox, the first sidewall being disposed to separate the lubricant reservoir from the accessory gearbox, and an accessory gearbox including a forward wall extending transversely with respect to the axial direction, an aft wall spaced apart from the forward wall in the axial direction and disposed aft of the forward wall, and at least a first sidewall extending in the axial direction and connecting the forward wall to the aft wall, the forward wall of the accessory gearbox at least partially defining the air intake manifold of the engine; a plurality of rotatable shafts (271, 281, 34) that are extending along the axial direction through the aft wall of the accessory gearbox, each respective rotatable shaft being disposed to be connected to drive a respective one of the auxiliary accessories of the engine; gearing (36, 38) disposed within the accessory gearbox and connected to the shafts; and a lubricant reservoir for containing lubricant for the accessory gearbox, the lubricant reservoir being configured to be connected to be supplied with lubricant from the lubricant supply of the engine, the lubricant reservoir being defined in part by the first sidewall of the accessory gearbox, the first sidewall being disposed to separate the lubricant reservoir from the accessory gearbox, and wherein the lubricant reservoir defines an aft chamber projecting axially aft beyond the aft wall of the accessory gearbox.