14 C.F.R. § 77.27
Initiation of studies
The FAA will conduct an aeronautical study when:
(a) Requested by the sponsor of any proposed construction or alteration for which a notice is submitted; or
(b) The FAA determines a study is necessary.
The FAA will conduct an aeronautical study when:
(a) Requested by the sponsor of any proposed construction or alteration for which a notice is submitted; or
(b) The FAA determines a study is necessary.