How many consecutive nut plate installations need to meet requirements before final assembly?

The requirement for consecutive nut plate installations before final assembly is typically five. This standard ensures that the installation process is consistent and that the assembly meets quality and safety standards. By requiring five successful installations, it allows for a sufficient level of practice to ensure that the technician is proficient in the technique and can maintain the necessary tolerances and specifications for the assembly. This practice helps to minimize errors in the installation process and ensures that all components will perform reliably in the final assembly of the aerospace structure.