Motors: expansible chamber type – With correlated control of motive fluid and locking means – Sequential operation of locking means and motive fluid control
Patent
1994-06-16
1995-07-11
Lopez, F. Daniel
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Sequential operation of locking means and motive fluid control
91 45, F15B 1526
Patent
active
054310857
ABSTRACT:
An actuator for a thrust reverser is disclosed which will prevent retraction of the thrust reverser door from its open, reverse thrust position should there be a malfunction in the locking system which locks the thrust reverser door in its closed forward thrust position. Upon deployment of the thrust reverser during a normal aircraft landing, should there be a malfunction in the thrust reverser door locking system, the actuator holds the thrust reverser doors in their opened positions so as to provide a positive, visual indication of such a system malfunction. The actuator has an internal device in the actuator head which, in cooperation with the control rod of the secondary mechanical locking system prevents hydraulic fluid from retracting the actuating piston and rod assembly from their extended positions and thereby prevents retraction of the thrust reverser door from the reverse thrust positions. Since thrust reverser doors are always fitted with position sensors, the failure of the thrust reverser door to return to its forward thrust position will be sensed by the normal aircraft position sensors so as to provide a positive indication to the aircraft crew of a defect in the mechanical locking system.
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Lopez F. Daniel
S.N.E.C.M.A. - Societe Nationale d'Etude et de Construction de M
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