Aircraft door sealing system and aircraft door arrangement

1. An aircraft door sealing system comprising:

a sealing element which comprises a resilient material and which can be secured to a first element of an aircraft door arrangement and which comprises a sealing member and a sealing lip which extends from the sealing member, and

a counter-bearing element which comprises a rigid material and which can be secured to a second element of the aircraft door arrangement and which is configured to cooperate with the sealing element in order to seal a gap which is present between the first and the second element of the aircraft door arrangement and which has a first counter-bearing portion which is provided to cooperate with the sealing member of the sealing element and a second counter-bearing portion which is provided to cooperate with the sealing lip of the sealing element,

wherein the sealing lip and the second counter-bearing portion are positioned relative to each other in such a manner and the sealing lip can be resiliently deformed in such a manner that the sealing lip is applied to the second counter-bearing portion, and a contact face between the sealing lip and the second counter-bearing portion is formed or increases when an external pressure which acts on an outer face of the sealing lip via the gap between the first and the second element of the aircraft door arrangement, when the aircraft door sealing system is in a state mounted in the aircraft door arrangement, exceeds a threshold value,

wherein the sealing member of the sealing element is constructed in a tubular manner and has an inner hollow space and at least one ventilation opening which is connected to the inner hollow space,

wherein the counter-bearing element comprises a first securing portion having a free first end and a second end, and

wherein the first and the second counter-bearing portions are connected to the second end of the first securing portion,

wherein the counter-bearing element further comprises a second securing portion which is connected to the second counter-bearing portion, wherein the second securing portion extends at an angle of approximately from 120 to 130°relative to the second counter-bearing portion.

2. The aircraft door sealing system according to claim 1 , wherein the threshold value corresponds to a water pressure which acts on the outer face of the sealing lip in the event of a water landing of an aircraft which is provided with the aircraft door sealing system.

3. The aircraft door sealing system according to claim 1 , wherein the sealing member and the first counter-bearing portion are positioned relative to each other in such a manner and the sealing member can be resiliently deformed in such a manner that the sealing member is applied to the first counter-bearing portion, and a contact face between the sealing member and the first counter-bearing portion is formed or increases if, when the aircraft door sealing system is in the state mounted in the aircraft door arrangement, an internal pressure in the inner hollow space of the sealing member corresponds to an internal pressure in an aircraft cabin provided with the aircraft door arrangement.

4. The aircraft door sealing system according to claim 1 , further comprising a retention member to secure the sealing element to the first element of the aircraft door arrangement.

5. The aircraft door sealing system according to claim 4 , wherein the retention member comprises at least one of:

a retention profile which comprises a first profile element which can be secured to an inner face of the first element of the aircraft door arrangement and a second profile element which extends substantially perpendicularly to the first profile element, or a retention clamp which cooperates with a base portion of the sealing element in order to fix the sealing element to the first profile element of the retention profile of the retention member.

6. The aircraft door sealing system according to claim 5 , wherein the retention member comprises the retention profile which comprises the first profile element and the second profile element,

wherein the sealing lip of the sealing element has a first portion which extends substantially parallel with the second profile element of the retention profile and a second portion which protrudes beyond the second profile element of the retention profile in a direction of the second counter-bearing portion.

7. The aircraft door sealing system according to claim 1 , wherein the first and the second counter-bearing portions of the counter-bearing element extend substantially perpendicularly to each other.

8. An aircraft door arrangement comprising:

a first element,

a second element, and

an aircraft door sealing system according to claim 1 ,

wherein the sealing element of the aircraft door sealing system is secured to the first element and the counter-bearing element of the aircraft door sealing system is secured to the second element.

9. The aircraft door arrangement according to claim 8 , wherein the first element is constructed as an aircraft door and the second element is constructed as a door frame.

10. The aircraft door arrangement according to claim 9 , wherein the second element comprises at least one aircraft primary structural component which is arranged adjacent to a door opening of the aircraft door arrangement and a securing strut.

11. The aircraft door arrangement according to claim 10 , wherein the securing strut is secured to the aircraft primary structural component and extends from the aircraft primary structural component in a direction of the door opening.

12. The aircraft door arrangement according to claim 10 , wherein the first securing portion of the counter-bearing element is secured to the securing strut.

13. The aircraft door arrangement according to claim 10 , wherein a second securing portion of the counter-bearing element is secured to the aircraft primary structural component.