What indicates genuine rivet tipping in a stressed skin metal wing assembly?

In a stressed skin metal wing assembly, genuine rivet tipping is indicated by consecutive rivet heads tipped in the same direction. This specific pattern signifies that the rivets have been properly compressed during the assembly process, which is crucial for maintaining the structural integrity of the wing. When rivets tip in the same direction, it typically means that they have been loaded evenly, suggesting that the rivets are seated correctly and contributing appropriately to the structural load.

Rivet tipping can occur due to the application of forces during flight or when the assembly is installed, and it is a natural occurrence in skilled assemblies. When rivets tip consistently in the same direction, it is evidence that they are working together as intended to distribute loads effectively.

The other options would suggest inconsistencies that could indicate improper installation or structural issues. For example, inconsistent rivet head angles would imply a lack of uniformity, which could lead to compromised strength. Similarly, rivet heads tipped in different directions could suggest that the rivets are experiencing unequal loads, potentially leading to failure under stress. Lastly, no visible tipping of rivet heads could mean that either the rivets have not been sufficiently loaded, or the assembly has not undergone the necessary stresses, which may not reveal the true performance