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Off-Airport Obstruction Evaluations

The department evaluates proposed development on and nearby public airports to assess its impact upon navigable airspace and potential compatibility conflicts with flight operations.
Pennsylvania law requires: A person who proposes to erect a new structure, to add to an existing structure or to erect or maintain an object, natural or manmade, in close proximity to a public airport, as defined in 14 CFR § 77.9 (Construction or alteration Requiring Notice), shall first obtain approval from the department by submitting a written notice PA Form AV-57 (PDF) at least 30 days prior to commencement thereof.
The FAA has created a Notice Criteria Tool to help developers determine if a propsoal requires notification to the department.