(19)

(11)

EP 0 317 577 A1

(12)

(43) Date of publication: 31.05.1989 Bulletin 1989/22 (21) Application number: 87907687.0 (22) Date of filing: 15.06.1987

(51) International Patent Classification (IPC):  B64C 13/ 12( . ) B64C 13/ 14( . ) (86) International application number: PCT/US1987/001360 (87) International publication number: WO 1988/010209 (29.12.1988 Gazette 1988/28)

(84) Designated Contracting States: DE FR GB IT (71) Applicant: Bell Helicopter Textron Inc. Fort Worth Texas 76053 (US)	(72) Inventors: SMITH, Andrew Arlington, TX 76014 (US) WOLSTENCROFT, Frank Bedford, TX 76021 (US) (74) Representative: UEXKÜLL & STOLBERG  Patentanwälte Beselerstrasse 4 D-22607 Hamburg D-22607 Hamburg (DE)