(a) Unless it is otherwise extended, revised, or terminated, each final
determination of no hazard made under this subpart or subpart B or E of
this part expires 18 months after its effective date, regardless of
whether the proposed construction or alteration has been started, or on
the date the proposed construction or alteration is abandoned, whichever
(b) In any case, including a determination to which paragraph (d) of
this section applies, where the proposed construction or alteration has
not been started during the applicable period by actual structural work,
such as the laying of a foundation, but not including excavation, any
interested person may, at least 15 days before the date the final
determination expires, petition the FAA official who issued the
(1) Revise the determination based on new facts that change the basis
on which it was made; or
(2) Extend its effective period.
(c) The FAA official who issued the determination reviews each petition
presented under paragraph (b) of this section, and revises, extends, or
affirms the determination as indicated by his findings.
(d) In any case in which a final determination made under this subpart
or subpart B or E of this part relates to proposed construction or
alteration that may not be started unless the Federal Communications
Commission issues an appropriate construction permit, the effective period
of each final determination includes --
(1) The time required to apply to the Commission for a construction
permit, but not more than 6 months after the effective date of the
(2) The time necessary for the Commission to process the application
except in a case where the Administrator determines a shorter effective
period is required by the circumstances.
(e) If the Commission issues a construction permit, the final
determination is effective until the date prescribed for completion of the
construction. If the Commission refuses to issue a construction permit,
the final determination expires on the date of its refusal.