Page 294 - Fluid Power Engineering

260 Chapter Twelve

c. Minimize lighting, use nonreflective materials, choose ap-
propriate colors, commitment to maintain turbines so they
are functioning and have no visible blemishes like oil leaks,
and commitment to decommission nonoperating turbines.
d. Design infrastructure like substation and transmission in a
manner that hides it from view
e. Minimize vegetation removal, screening, and noise.
6. Determination of unacceptable or undue aesthetic impacts.
The final aspect of the assessment is to make a determination if
the proposed project will pose an unacceptable visual impact
based on the information collected in the five steps above.

Hazard to Aviation
Although hazard to aviation is not strictly an environmental impact,
it is part of the permitting process. In this section, the process used
in the United States is described as an example. Projects must consult
local aviation jurisdiction for specific guidance, processes, and rules.
The US Federal Aviation Administration (FAA) administers the
efficient use of navigable airspace under Title 14 of Code of Fed-
eral Regulations Part 77. To accomplish this, FAA performs an Ob-
struction Evaluation/Airport Airspace Analysis (OE/AAA) through
Form 7460-1, Notice of Proposed Construction or Alteration. The ap-
plication for evaluation may be filled out online at https://oeaaa.
faa.gov/oeaaa/external/portal.jsp. The outcome of this process is a
determination by the FAA that the proposed structure is or is not a
hazard to aviation. In addition, FAA provides guidance on Obstruc-
tion Marking and Lighting, which describes the standards for lighting
and marking required on the structure.
Notification to FAA is required for: 9
1. Any construction or alteration of more than 200 ft in height
above the ground level
2. Any construction or alteration:
i. Within 20,000 ft of a public use or military airport that
exceeds a 100:1 surface from any point on the runway of
each airport with at least one runway more than 3,200 ft
ii. Within 10,000 ft of a public use or military airport that
exceeds a 50:1 surface from any point on the runway of
each airport with its longest runway no more than 3,200 ft
iii. Within 5,000 ft of a public use heliport that exceeds a 25:1
surface

In the above specification, 25:1 surface is a plane that starts from
the edge of the airport and has a gradient of 1-ft elevation from ground