Monitor for uncommanded braking

Apparatus for monitoring uncommanded braking for an aircraft having landing gear that can move between a retracted position and an actuated position, the landing gear having a wheel and a hydraulically operated wheel braking system with a brake pedal for controlling operation of said wheel braking system, comprising:

• means for determining brake pedal application and for generating a pedal application signal indicating actuation of the wheel braking system when said brake pedal has been applied;
• means for measuring brake pressure communicated to said wheel braking system;
• means for comparing said brake pressure with a selected threshold brake pressure and for generating a brake pressure signal when said brake pressure exceeds said threshold brake pressure;
• a gear test inhibit logic circuit for generating a test inhibit signal for inhibiting the apparatus for monitoring uncommanded braking when the landing gear is actuated and permitting operation of the apparatus for monitoring uncommanded braking when the landing gear is retracted;
• a shut off valve connected to said wheel braking system for preventing communication of brake pressure to said wheel braking system, in order to prevent braking;
• and
• fault latch means for receiving said pedal application signal, said brake pressure signal, and said gear test inhibit signal, and for generating a fault latch output signal for controlling said shut off valve responsive to said pedal application signal, said brake pressure signal, and said gear test inhibit signal.