21. The hydraulically operated retractable landing gear units all retract rearward, and each unit is twin-wheeled. 22. The CB750 had a hydraulically operated single piston sliding caliper with a solid front disc. 23. The hydraulically operated clutch was new as well, and an optional Laycock-de Normanville Humber Hawk. 24. The aircraft has a hydraulically operated airstair in the forward cabin for entry and exit. 25. All other locks on the Thames are hydraulically operated . 26. Most retraction systems are hydraulically operated , though some are electrically operated or even manually operated. 27. The British Navy operated a hydraulically operated twin-gun mount. 28. The brakes were by Girling, hydraulically operated , with 9 in . ( 229 mm ) drums. 29. The preferred tool for engine rotation is an electrically powered, hydraulically operated " turning jack ". 30. The hydraulically operated brake and pawl allows the anchor to be dropped from the ship's bridge.
