Method for monitoring the locking means of an electrical thrust reversal system for a turbine engine

1. A computer implemented method for monitoring at least one locking device of an electrical thrust reversal system for a turbine engine in an airplane, said electrical thrust reversal system comprising a thrust reverser and a first, a second and a third locking device, the locking devices being able to be placed in a closed position in which the deployment of the thrust reverser is not possible, and in an open position in which the deployment of the thrust reverser is possible, the opening and the closing of the first and the second locking device being commanded by a control unit, the control unit and the third locking device being supplied by an electrical network of the airplane, the method being carried out by a computer prior to the take-off of the airplane, the method comprising:

verifying, by the computer, that the airplane is on the ground and that the turbine engine is stopped;

after said verifying, sending, by the computer, a command for opening the locking devices, the sending comprising:

sending, by the computer, to the electrical network of the airplane an order for powering up the control unit and the third locking device;

sending, by the computer, to the control unit an order for opening the first and the second locking device;

verifying, by the computer, the opening of said locking devices;

sending, by the computer, a command for closing the locking devices.

2. The monitoring method according to claim 1 , further comprising verifying, by the computer, the closing of the locking devices following the sending of the command for closing the locking devices.

3. The monitoring method according to claim 2 , wherein sending the command for closing the locking devices comprises:

sending, by the computer, to the control unit an order for closing the first and the second locking device;

sending, by the computer, to the electrical network of the airplane an order to stop the powering up of the third locking device;

sending, by the computer, to the electrical network of the airplane an order to stop the powering up of the control unit.

4. The monitoring method according to claim 1 , wherein said method is set in motion automatically on turning on the computer.

5. The monitoring method according to claim 1 , wherein said method is set in motion manually.

6. The monitoring method according to claim 1 , further comprising sending, by the computer, an alert message to a flight deck of the airplane if at least one of the locking devices is not open.

7. The monitoring method according to claim 1 , further comprising recording, in a maintenance system of the airplane, the result of the verifying of the opening of the locking devices.

8. The monitoring method according to claim 1 , wherein the computer is a Full Authority Digital Engine Control (FADEC) computer.

9. A computer comprising components for implementing a method for monitoring at least one locking device of an electrical thrust reversal system for a turbine engine in an airplane, said electrical thrust reversal system comprising a thrust reverser and a first, a second and a third locking device, the locking devices being able to be placed in a closed position in which the deployment of the thrust reverser is not possible, and in an open position in which the deployment of the thrust reverser is possible, the opening and the closing of the first and the second locking device being commanded by a control unit, the control unit and the third locking device being supplied by an electrical network of the airplane, the method being carried out by the computer prior to the take-off of the airplane, the method comprising:

verifying that the airplane is on the ground and that the turbine engine is stopped;

after said verifying, sending, by the computer, a command for opening the locking devices, the sending comprising:

sending, by the computer, to the electrical network of the airplane an order for powering up the control unit and the third locking device;

sending, by the computer, to the control unit an order for opening the first and the second locking device;

verifying the opening of said locking devices;

sending, by the computer, a command for closing the locking devices.

10. The computer according to claim 9 , wherein the computer is a Full Authority Digital Engine Control (FADEC) computer.

11. A turbine engine comprising a computer comprising components for implementing a for monitoring at least one locking device of an electrical thrust reversal system for a turbine engine in an airplane, said electrical thrust reversal system comprising a thrust reverser and a first, a second and a third locking device, the locking devices being able to be placed in a closed position in which the deployment of the thrust reverser is not possible, and in an open position in which the deployment of the thrust reverser is possible, the opening and the closing of the first and the second locking device being commanded by a control unit, the control unit and the third locking device being supplied by an electrical network of the airplane, the method being carried out by the computer prior to the take-off of the airplane, the method comprising:

verifying that the airplane is on the ground and that the turbine engine is stopped;

sending, by the computer, a command for opening the locking devices, the sending comprising:

sending, by the computer, to the electrical network of the airplane an order for powering up the control unit and the third locking device;

sending, by the computer, to the control unit an order for opening the first and the second locking device;

verifying the opening of said locking devices;

sending, by the computer, a command for closing the locking devices.