Obstruction Evaluation and Airport Airspace Analysis

FAA Notice of Preliminary Findings

Receiving a Notice of Preliminary Findings does not necessarily mean your proposal will impact Airspace. Williams Aviation will analyze the potential impacts and determine if the FAA concerns have validity.

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FAA Obstruction Marking and Lighting

Williams has expertise in the development of innovative and workable alternative solutions when FAA “Marking and Lighting Recommendations” are impractical or otherwise unworkable.

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CFR Part 77 - Safe, Efficient Use, and Preservation of the Navigable Airspace

CFR Part 77 establishes a complex structure of imaginary surfaces in relation to each runway at airports or helipads.  The size of each imaginary surface is based on the category of each runway according to the type of instrument approach available or planned for that runway.

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Terminal Instrument Procedures (TERPS)

The purpose of the United States Standard for Terminal Instrument Procedures is to prescribe the criteria for the formulation, review, approval, and publishing of procedures for Instrument Flight Rules (IFR) operations to and from civil and military airports.

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One Engine Inoperative (OEI)

All commercial airlines are required to develop OEI procedures for each airport/runway out of which they conduct flight operations.  The Federal Aviation Regulations (FARs) prescribe that in the event of an engine failure on takeoff, commercial air carrier-type aircraft must be loaded in such a manner that they are able to clear obstacles along their intended route of flight by either 35 feet vertically or 300 feet laterally.

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