根据§ 2.1043要求，允许的变更有如下三类：
CLASS I – Equipment changes that do not degrade the data reported to the Commission.
CLASS II – Equipment changes that do degrade the data reported to the Commission.
CLASS III – Changes in software for Software Defined Radio Equipment.
备注 ：除了轻微的外观变化，大多数认证设备的变化都需要测试来确定，无论变更是一级、二级还是三级许可变更。II类和III类许可变更必须向委员会报告，且测试需要由FCC认可的实验室进行。