Dual cam control mechanism for coordinated deployment and retraction of an air-craft's leading and trailing edge wing flaps

摘要

In the disclosed mechanism a primary position control cam has first and second camming surfaces for cooperating with separate followers that in turn act through a hydraulic subsystem to position the leading and trailing edge wing flaps in response to a single, pilot operated control lever. A secondary cam also having first and second camming surfaces correspondingly shaped to those of the primary cam, is slaved to the actual, hydraulically effected movement of the trailing edge flaps. Cooperating with the first surface of the secondary cam is a feedback follower for providing a mechanical feedback signal that assists the primary cam and the associated hydraulics in positioning the trailing edge flaps. An override follower cooperates with the second camming surface on the secondary cam and mechanically overrides the ability of the primary cam's second surface follower to position the leading edge flaps under certain conditions, so as to ensure a predetermined, aerodynamically critical sequencing of the hydraulically effected movements of the leading and trailing edge flaps as they seek the positions commanded by the single, pilot operated lever.