Abstract: An example system includes an electrical machine electrically configured to generate electrical energy used by one or more components of a gas-turbine engine; an energy storage system; and a controller electrically connected to the energy storage system and configured to receive electrical energy from the energy storage system, wherein, in response to the gas-turbine engine being shut off, the controller is configured to cause the electrical machine to rotate a rotor of the gas-turbine engine using the energy received from the energy storage system.

Abstract: A gas turbine engine includes an engine core including: a compressor system including first, lower pressure compressor, and second, higher pressure compressor; and an outer core casing. The engine includes a front mount arranged for connection to a pylon; and a fan located upstream of the engine core. The outer core casing includes a first flange connection that: is arranged to allow separation of the outer core casing at an axial position thereof, and is the first flange connection downstream of an axial position defined by the axial midpoint between the mid-span axial location on trailing edge of the most downstream aerofoil of first compressor and mid-span axial location on leading edge of the most upstream aerofoil of the second compressor. A front mount position ratio of: axial ? ? distance ? ? between ? ? the ? ? first ? ? flange ? ? connection and ? ? the ? ? front ? ? mount first ? ? flange ? ? radius is equal to or less than 1.18.

Abstract: A method is provided of producing a rigid raft comprising electrical conductors enclosed in the raft. The method includes: providing a cured, composite material base layer; laying up electrical conductors on the base layer; and overlaying the laid-up electrical conductors with a cover layer, thereby producing a rigid raft in which the electrical conductors are enclosed in the raft.

Abstract: Automatic control device (30) (30?) (30?) for an electromagnetic damper of vibrations (50) having windings (51) arranged around a rotor (62) of a rotating machine (60) and supplied by an electric signal; the electromagnetic damper of vibrations also having a magnetic circuit (54), constituted by a first part (54a) and a second part (54b) separated between them by an air gap (54c). The automatic control device (30) (30?) (30?) includes: amplification stages (32) (32?) (32?) for supplying the windings (51) and having at least an output (32a) (32?a) (32?a); signal processing stages (31) (31?) (31?) electrically connected to the amplification stages (32) (32?) (32?). The signal processing stages (31) supply the amplification stages (32) (32?) (32?) on the basis of an electric signal (a(t)) of voltage and/or current drawn on at least one output (32a) (32?a) (32?a); by one or more sensible elements (34) remote in comparison with the rotor (62) and variable as an inductance of the windings (51) varies.

Abstract: A fuel supply system has valve communicating fuel to fuel nozzles. A fuel manifold supplies fuel to the valve. The valves are controlled by rotary drives extending from an actuator. At least part of the drive lies within the fuel manifold which serves to keep the drive cool and reduce significantly the number of seals required.