Counter-rotating turbine of an aircraft turbomachine and method for the non-destructive testing of a counter-rotating turbine rotor

A counter-rotating turbine of an aircraft turbomachine, comprising:

• a casing comprising at least one endoscopy port configured for an endoscopy plug of a non-destructive testing device to pass into said casing, said non-destructive testing device comprising said endoscopy plug adapted to be secured in a endoscopy port of a radially outer rotor of the counter-rotating turbine, said endoscopy plug comprising means for acquiring and transmitting images configured to acquire images of the rotor and to send said acquired images, and means for receiving and displaying images configured to receive and display said acquired images, said means for receiving and displaying images being connected to said means for acquiring and transmitting images by means of a wireless connection,
• a first rotor, referred to as radially inner rotor, connected to a first turbine shaft and configured to rotate in a first direction of rotation,
• a second rotor, referred to as radially outer rotor, connected to a second turbine shaft and configured to rotate in a direction of rotation opposite to the first direction of rotation,
• said second rotor being arranged radially around said first rotor,
• said casing being arranged radially around said second rotor,
• and wherein said radially outer rotor has an endoscopy port into which the endoscopy plug of the non-destructive testing device is releasably secured.