Abstract: A hardover protection system for an aircraft. A differential motion sensor is mounted to a sector for receiving cockpit pitch commands input via a cable system. The motion sensor includes a pair of cranks held together by a predetermined spring preload. One of the cranks is coupled to a rod that forms a portion of a power linkage for hydraulically driving an elevator surface while the other is coupled to a rod that is linked to a shutoff valve. A linkage for mechanically driving an elevator control tab is also mounted to the sector. The design of the shutoff valve and its location within the aircraft's hydraulic control system interact to disable powered operation of the elevator surface upon a predetermined degree of deflection of the shutoff valve piston. Such deflection is responsive to the detection of a predetermined mismatch between the input command motion to the sector and the output motion of the power linkage.

Abstract: In a combine harvester header, a modified hydraulic cylinder for controlling reel height includes a cylinder rod sub-assembly having a threaded portion permitting rotation of the cylinder rod to make adjustment of the cylinder rod effective length for fine or supplementary adjustment of the harvester reel relative to the platform cutterbar. A dual purpose member, pivotably captive on a rotatable nut portion of the cylinder rod sub-assembly, is swingable between an approximately horizontal position in which it serves as a wrench handle for rotatably adjusting the cylinder rod threaded portion and, downwards, into a safety stop position where it is engageable with the end of the body of the hydraulic cylinder to prevent inadvertent lowering of the reel from a fully raised position.