(19)

(11)

EP 3 963 276 A1

(12)

(43) Date of publication: 09.03.2022 Bulletin 2022/10 (21) Application number: 20721288.7 (22) Date of filing: 23.04.2020

(51) International Patent Classification (IPC):  F28D 1/03(2006.01) F28F 3/12(2006.01) F28D 9/00(2006.01) F28F 1/02(2006.01) (52) Cooperative Patent Classification (CPC): F28F 2225/04; F28F 3/12; F28D 2021/0021; F28F 2009/224; F28F 21/086; F28D 1/0383; F28F 2210/10; F28F 2210/04 (86) International application number: PCT/GB2020/051004 (87) International publication number: WO 2020/221988 (05.11.2020 Gazette 2020/45)

(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: 30.04.2019 GB 201906005 30.04.2019 EP 19275062 (71) Applicant: BAE Systems PLC London SW1Y 5AD (GB)	(72) Inventors: PRICE, Howard James Balderstone Lancashire BB2 7LF (GB) PARKER, John Francis Preston Lancashire PR4 1 AX (GB) PEARSON, David Peter Preston Lancashire PR4 1AX (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)