; or (B) other airspace above areas in which operations of unmanned aircraft pose very low risk. (7) Exemption from certain requirements To the extent consistent with aviation safety, the Administrator may exempt applicants under the final rule from requirements under sections 44702, 44703, and 44711. (8) Certificate modifications and revocations A certificate issued under the final rule may, at any time, be modified or revoked by the Administrator. (c) Consultation In carrying out this section, the Administrator shall consult with other Federal agencies, as appropriate. 45507. Special rules for certain UTM and low-altitude CNS (a) In general Notwithstanding any other requirement of this chapter, and not later than 120 days after the date of enactment of this section, the Secretary of Transportation shall determine if certain UTM and low-altitude CNS may operate safely in the national airspace system before completion of the rulemaking required by section 45506. (b) Assessment of UTM and low-Altitude CNS In making the determination under subsection (a), the Secretary shall determine, at a minimum, which types of UTM and low-altitude CNS, if any, as a result of their operational capabilities, reliability, intended use, and areas of operation, and the characteristics of the aircraft involved, do not create a hazard to users of the national airspace system or the public. (c) Requirements for safe operation If the Secretary determines that certain UTM and low-altitude CNS may operate safely in the national airspace system, the Secretary shall establish requirements for their safe operation in the national airspace system. (d) Expedited procedures The Secretary shall provide expedited procedures for reviewing and approving UTM or low-altitude CNS operated to monitor or control aircraft operated primarily or exclusively in airspace above— (1) croplands; (2) areas other than congested areas