Pilot operated no-back

A pilot operated no-back comprising:

• a housing;
• input and output shafts journalled in said housing;
• a brake disc pack within said housing and compressible into connection with said output shaft to prevent rotation of said output shaft;
• a ball ramp mechanism having a rotary input plate coupled to said input shaft and a rotary output plate adjacent said input plate and movable with respect to said input plate to compress said brake disc pack;
• and
• a selectively operable pilot brake connected to said output shaft for retarding rotation of said output plate.

In an aircraft having movable control surfaces, a control means for selectively preventing movement of said control surfaces as a result of loads applied to said control surfaces, that control means comprising:

• an input shaft means for receiving motive force from a source;
• an output shaft means, connected to said control surfaces, for applying said motive force to said control surfaces;
• a coupling means for interconnecting said input shaft means to said output shaft means to allow transfer of motive force therebetween;
• said coupling means including a brake means and a pilot means;
• said brake means being connected to said output shaft means in response to motive force being applied to said output shaft means as a result of loads applied to said control surfaces, that connection serving to prevent movement of said output shaft means;
• and
• said pilot means being connected to said brake means so as to selectively disable the connection of said brake means to said output shaft means which prevents movement of said output shaft means, such that loads applied to said control surfaces can, when so selected, apply motive force to said output shaft means and, thereby, to said input shaft means.

A no-back apparatus, comprising:

• an input shaft means for receiving first motive power from a controllable source;
• an output shaft means for transferring said first motive power therethrough and for receiving second motive power from a load source;
• a coupling means for interconnecting said input shaft means to said output shaft means to allow the transfer of said first or second motive power therebetween;
• said coupling means including a brake means for connection to said output shaft means to permit transfer of said first motive power from said input shaft means to said output shaft means, and to prevent transfer of said second motive power from said output shaft means to said input shaft means;
• and
• said coupling means including pilot means, having a connection to said brake means, for selectively preventing connection of said brake means to said output shaft such that transfer of said second motive power to said input shaft means from said output shaft means is permitted.