FAA Study. Aeronautical studies of Mitigating Adverse Effects. The adverse FAA Notice is Required. Notification of

man-made features from becoming hazards to navigation.

108. FAA STUDY OF EXISTING POTENTIAL

HAZARDS TO AIR NAVIGATION. Existing objects that are obstructions to air navigation are presumed to be hazards until an FAA study determines otherwise.

a. FAA Study. Aeronautical studies of

existing objects are conducted when deemed necessary by the FAA to determine the physical and electromagnetic effect on the use of navigable airspace and air navigational facilities. Aeronautical studies of existing objects may be initiated as a result of information received or a situation observed.

b. Mitigating Adverse Effects. The adverse

effect of an object presumed or determined to be a hazard to air navigation may be mitigated by: 1 Removing the object. 2 Altering the object, e.g. reducing its height. 3 Marking andor lighting the object, provided an FAA aeronautical study has determined that the object would not be a hazard to air navigation if it were marked and lighted. Guidance on marking and lighting objects is contained in AC 707460-1, Obstruction Marking and Lighting. 109. PROPONENT RESPONSIBILITIES TO NOTIFYING THE FAA OF PROPOSED CONSTRUCTION OF OBJECTS AFFECTING NAVIGABLE AIRSPACE. 14 CFR Part 77, Objects Affecting Navigable Airspace, requires persons proposing any construction or alteration described in Section 77.13 a to give 30-day notice to the FAA of their intent. Part 77 also specifies standards for determining obstructions to air navigation and provides for FAA aeronautical studies of obstructions to determine their effect on the safe and efficient use of airspace. AC 707460-2 Proposed Construction or Alteration of Objects That May Affect Navigable Airspace.

a. FAA Notice is Required. Notification of

the proposal should be made on FAA Form 7460-1, Notice of Proposed Construction or Alteration, available from the Airports web site http:faa.govarpforms. The proposed construction or alteration of structures or objects in the vicinity of a heliport requiring notice to the FAA includes: 1 Any construction or alteration of more than 200 feet 61 m above ground level AGL at its site. 2 Any construction or alteration of greater height than an imaginary surface located within 5,000 feet 1,524 m of a public-use or military heliport and penetrate a 25:1 sloping surface extending outward and upward originating at the heliport as illustrated in Figure 1-5. 3 When the FAA requests notice.

b. Penalty for Failure to Provide Notice.