Fees established under this part for any filing will also be charged, as appropriate, for any substantial amendment to a pending filing. An amendment is considered substantial if it changes the character, nature, or the magnitude of the proposed activity or rate in the pending filing. For purposes of this section, an application for a temporary certificate is not considered to be an amendment to a pending certificate application. [Order 433-A, 51 FR 43607, Dec. 3, 1986] Subpart B_Fees Applicable to the Natural Gas Act and Related Authorities