(19)

(11)

EP 4 256 266 A1

(12)

(43) Date of publication: 11.10.2023 Bulletin 2023/41 (21) Application number: 21823990.3 (22) Date of filing: 26.11.2021

(51) International Patent Classification (IPC):  F28D 1/03(2006.01) F28D 21/00(2006.01) F28D 9/00(2006.01) F28D 1/02(2006.01) (52) Cooperative Patent Classification (CPC): F28D 2021/0021; F28D 1/03; F28D 9/0093; F28D 2001/0266 (86) International application number: PCT/GB2021/053089 (87) International publication number: WO 2022/117999 (09.06.2022 Gazette 2022/23)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 03.12.2020 GB 202019056 (71) Applicant: BAE SYSTEMS plc London SW1Y 5AD (GB)	(72) Inventor: GREICIUNAS, Evaldas Leeds LS25 1NB (GB) (74) Representative: BAE SYSTEMS plc Group IP Department  Warwick House P.O. Box 87 Farnborough Aerospace Centre Farnborough Hampshire GU14 6YU Farnborough Hampshire GU14 6YU (GB)