660 

14 CFR Ch. I (1–1–24 Edition) 

§ 77.27 

(b) The purpose of an aeronautical 

study is to determine whether the 
aeronautical effects of the specific pro-
posal and, where appropriate, the cu-
mulative impact resulting from the 
proposed construction or alteration 
when combined with the effects of 
other existing or proposed structures, 
would constitute a hazard to air navi-
gation. 

(c) The obstruction standards in sub-

part C of this part are supplemented by 
other manuals and directives used in 
determining the effect on the navigable 
airspace of a proposed construction or 
alteration. When the FAA needs addi-
tional information, it may circulate a 
study to interested parties for com-
ment. 

§ 77.27

Initiation of studies. 

The FAA will conduct an aero-

nautical 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. 

§ 77.29

Evaluating aeronautical effect. 

(a) The FAA conducts an aero-

nautical study to determine the impact 
of a proposed structure, an existing 
structure that has not yet been studied 
by the FAA, or an alteration of an ex-
isting structure on aeronautical oper-
ations, procedures, and the safety of 
flight. These studies include evalu-
ating: 

(1) The impact on arrival, departure, 

and en route procedures for aircraft op-
erating under visual flight rules; 

(2) The impact on arrival, departure, 

and en route procedures for aircraft op-
erating under instrument flight rules; 

(3) The impact on existing and 

planned public use airports; 

(4) Airport traffic capacity of exist-

ing public use airports and public use 
airport development plans received be-
fore the issuance of the final deter-
mination; 

(5) Minimum obstacle clearance alti-

tudes, minimum instrument flight 
rules altitudes, approved or planned in-
strument approach procedures, and de-
parture procedures; 

(6) The potential effect on ATC radar, 

direction finders, ATC tower line-of- 

sight visibility, and physical or elec-
tromagnetic effects on air navigation, 
communication facilities, and other 
surveillance systems; 

(7) The aeronautical effects resulting 

from the cumulative impact of a pro-
posed construction or alteration of a 
structure when combined with the ef-
fects of other existing or proposed 
structures. 

(b) If you withdraw the proposed con-

struction or alteration or revise it so 
that it is no longer identified as an ob-
struction, or if no further aeronautical 
study is necessary, the FAA may ter-
minate the study. 

§ 77.31

Determinations. 

(a) The FAA will issue a determina-

tion stating whether the proposed con-
struction or alteration would be a haz-
ard to air navigation, and will advise 
all known interested persons. 

(b) The FAA will make determina-

tions based on the aeronautical study 
findings and will identify the fol-
lowing: 

(1) The effects on VFR/IFR aero-

nautical departure/arrival operations, 
air traffic procedures, minimum flight 
altitudes, and existing, planned, or pro-
posed airports listed in § 77.15(e) of 
which the FAA has received actual no-
tice prior to issuance of a final deter-
mination. 

(2) The extent of the physical and/or 

electromagnetic effect on the oper-
ation of existing or proposed air navi-
gation facilities, communication aids, 
or surveillance systems. 

(c) The FAA will issue a Determina-

tion of Hazard to Air Navigation when 
the aeronautical study concludes that 
the proposed construction or alteration 
will exceed an obstruction standard 
and would have a substantial aero-
nautical impact. 

(d) A Determination of No Hazard to 

Air Navigation will be issued when the 
aeronautical study concludes that the 
proposed construction or alteration 
will exceed an obstruction standard but 
would not have a substantial aero-
nautical impact to air navigation. A 
Determination of No Hazard to Air 
Navigation may include the following: 

(1) Conditional provisions of a deter-

mination. 

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