{
  "$type": "site.standard.document",
  "description": "Aircraft power and propulsion systems 200 and methods 300 of starting gas turbine engines 101 of aircraft power and propulsion systems 200 are disclosed. In one example, an aircraft power and propulsion system 200 comprises: a gas turbine engine 101 having a first spool and a second spool, the…",
  "path": "/patents/1387720",
  "publishedAt": "2026-02-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02C7/266",
    "ROLLS ROYCE PLC [GB]"
  ],
  "textContent": "Aircraft power and propulsion systems 200 and methods 300 of starting gas turbine engines 101 of aircraft power and propulsion systems 200 are disclosed. In one example, an aircraft power and propulsion system 200 comprises: a gas turbine engine 101 having a first spool and a second spool, the first spool being a designated starting spool; one or more electrical networks 231, 233; a first electrical machine 211 mechanically coupled with the first spool; a second electrical machine 213 mechanically coupled with the second spool; a first power converter 221 having a first side and a second side, wherein a the first side of the first power converter 221 is connected to a winding 2111 of the first electrical machine 211, and the second side of the first power converter 221 is connected to one of the one or more electrical networks 231; a second power converter 223, having a first side and a second side, wherein the second side of the second power converter 223 is connected to one of the one or more electrical networks 233; and a controllable switching arrangement 240 configured so that a connection to the first side of the second power converter 233 is switchable between: a winding 2131 of the second electrical machine 213, whereby the second electrical machine 213 and the second power converter 223 are configured to extract power from the second spool in a generator mode or drive rotation of the second spool in a motor mode; or the winding 2111 of the first electrical machine 211, whereby the first and second power converters 221, 223 are connected in parallel to the winding 2111 of the first electrical machine 211 for supplying a starting current to the winding 2111 of the first electrical machine 211 for starting or restarting the gas turbine engine 101.",
  "title": "ELECTRICALLY STARTING A GAS TURBINE ENGINE"
}