If a repair deviated from the manufacturer's structure repair manual by using blind rivets, what action should be taken?

The correct action to take in this scenario is to consult with the manufacturer before making a decision. Utilizing a different type of fastening mechanism, such as blind rivets, instead of what is specified in the manufacturer's structure repair manual could potentially impact the structural integrity and safety of the aircraft. The manufacturer’s guidelines are established based on comprehensive analysis and testing, hence any deviation would need thorough assessment to determine its implications.

By consulting with the manufacturer, you ensure adherence to safety standards and maintain compliance with regulatory requirements, which is crucial for aircraft repairs. If the manufacturer acknowledges the use of blind rivets and deems them acceptable under specific conditions or with additional modifications, then the repair can proceed safely and legally. This course of action not only protects the integrity of the aircraft but also upholds the standards of the aviation maintenance community.