(19)

(11)

EP 0 510 152 A1

(12)

(43) Date of publication: 28.10.1992 Bulletin 1992/44 (21) Application number: 91919622.0 (22) Date of filing: 12.11.1991

(51) International Patent Classification (IPC):  F23R 3/ 32( . ) (86) International application number: PCT/GB1991/001988 (87) International publication number: WO 1992/008933 (29.05.1992 Gazette 1992/12)

(84) Designated Contracting States: DE FR GB (30) Priority: 13.11.1990 GB 19900024630 (71) Applicant: ROLLS-ROYCE plc London, SW1E 6AT (GB)	(72) Inventor: OVERTON, Dennis, Llewellyn 1 Cranham Drive Bristol BS12 6AQ (GB) (74) Representative: Bird, Vivian John  Rolls-Royce plc PO Box 3 Filton, Bristol BS12 7QE Filton, Bristol BS12 7QE (GB)