True or False: The flushness of the fastener head does not need to be measured if the rivet head is visually acceptable.

The statement is false because the flushness of a fastener head is a critical measurement in aerospace assembly. Even if a rivet head appears visually acceptable, it is essential to verify that it meets specified flushness tolerances. Proper flushness is vital for aerodynamic efficiency, structural integrity, and overall safety in aerospace applications.

Visual inspections alone may not reveal subtle misalignments or protrusions that could affect the performance of the assembly. Therefore, measurements must be taken to ensure that the fastener head is installed correctly and meets all engineering specifications. This level of diligence helps prevent potential issues during flight and ensures compliance with industry standards.