uh-oh! obstructions have been identified on my airport ... · so, you cut down the trees. now what?...
TRANSCRIPT
Uh-Oh! Obstructions Have Been Identified on My Airport -
Now What?
Matt Wagner, Mead & HuntBill Towle, St. Cloud Regional AirportKathy Vesely, MnDOT Aeronautics
Presentation Outline
1. Audience Polling Questions2. Types of Obstructions3. Part 77 Surfaces4. How to Maintain Clear Approaches5. 5010 Airport Inspections6. Obstruction Removal (from 5010)7. QUIZ!
What is an Obstruction?
Any object that penetrates an imaginary surface (FAR Part 77) or a terminal obstacle clearance area.
Types of Obstructions
• Trees• Buildings• Towers• Terrain• Crops• Cranes
Why eliminate Obstructions?
• Hazard to aviation• Turbulence• Wildlife attractants
FAR Part 77 Imaginary Surfaces
FAR Part 77 Imaginary Surfaces
Primary SurfaceA surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 200 feet beyond either end of the runway.
Common Obstructions:• Brush• Terrain• Crops
Primary Surface
Approach Surface
A surface longitudinally centered on the extended centerline of the
runway, beginning at the end of the Primary Surface. Primary Surface
width at end adjacent to runway end and flares out to a distance of 5,000
ft, 10,000 ft or 50,000 ft, depending on the approach category. The
surface slope is 20:1, 34:1 or 50:1/40:1.
Common Obstructions:
• Trees
• Towers
• Cranes
Transitional SurfaceExtends outward and upward, at right angles to the runway centerline and runway centerline extended, from the sides of the Primary Surface and the Approach Surfaces. The slope is 7:1 and the surface extends until it intersects the Horizontal or Conical Surface. Extends a distance of 5,000 feet measured horizontally from the edge of the Approach Surface.
Common Obstructions:• Trees• Buildings
Horizontal SurfaceA horizontal plane 150 feet above the established Airport Elevation, the perimeter of which is constructed by swinging arcs of specified radii (either 5,000 ft or 10,000 ft) from the center of each end of the Primary Surface of each runway. Tangents connect the adjacent arcs.
Common Obstructions:• Towers• Terrain
Conical SurfaceExtends upward and outward from the outer limits of the Horizontal Surface for a horizontal distance of 4,000 feet. The slope of the conical surface is 20:1.
Common Obstructions:• Towers• Terrain
Agricultural Operations at Minnesota Airports
Agricultural Operations at Minnesota Airports
Agricultural Operations at Minnesota Airports
What About TERPS?FAA Order 8260.3D – Standard for Terminal Instrument Procedures
Figure 3-4 Departure Surface for Instrument Runways
What About TERPS?Missed Approach
Maintaining Clear Approaches
• Daily Self Inspection– Constr. on or near airport– Vegetation or Trees– On the Part 139 checklist
Maintain Clear Approaches
• Survey to verify clear surfaces
• Determine tallest features
• Survey
If Obstructions are Suspected
• MN DOT 5010 Inspection
Professional Survey
Identify Obstructions
Identify Obstructions
Uh Oh! Obstructions – Now What?
Rick Braunig - April 25, 2019
Ways Obstructions are identified
• ALP Survey• Most thorough and most accurate way to identify obstructions
• Airport Obstruction Management Plan• Effective at close-in, recurring obstructions like brush or volunteering
trees off the ends or sides of the runways. Can be difficult for airport staff to accurately determine tree heights in the approach.
• Most consultants would be able to assist as would agencies with survey capabilities. MnDOT is willing to help explain the imaginary surfaces.
• 5010/Airport Inspection• Not a comprehensive survey, only picks up the tallest objects. One
point may identify 20 or more trees that need to be trimmed.
5010 Inspections
• MnDOT Aeronautics• Under contract with FAA• 3 year cycle• Part 77 Surfaces• Agriculture Operations• Based Aircraft
• Airport Licensing• MN Rules requirements• Phone / Toilets• Windsock / Fencing
There are different kinds of airports
•Part 139• Commercial Airline Service. Have special requirements to comply
with and are inspected by FAA inspectors. No 5010 inspection, but still are required to meet Minnesota licensing requirements.
•NPIAS• Compliance with FAA ACs is required through grant assurances.
5010/Airport Licensing inspections are conducted by MnDOT.
•Non-NPIAS• Only Minnesota criteria apply. 5010/Airport Licensing inspections
are conducted by MnDOT.
•MAC• MnDOT license Not Required
There are different kinds of Obstructions
•Part 77 Obstructions• Federal law which defines imaginary surfaces. • Minnesota airport licensing standards mirror / reflect Part 77.
•RPZ Obstructions• Defined in Airport Design Advisory Circular (AC). FAA requires
compliance with this and all other surfaces in the design guide through grant assurances for federal funds.
• Minnesota has a Clear Zone defined by policy and Land Use Safety Zones enforced through airport zoning.
•Departure Surface Obstructions• Another surface contained in the Airport Design AC that is more
restrictive (40:1) than Part 77 surfaces. • Minnesota has no corresponding surface.
5010 Inspection Results
• A Letter• 1 page = Good
• A Drawing
I have obstructions. So What?
• Grant Assurances
• 9. Pursuant to Minnesota Statutes Section 360.305, subdivision 4 (g) (1),
the Recipient will operate its airport as a licensed, municipally-owned public
airport at all times of the year for a period of 20 years from the date the
Recipient receives final reimbursement under this Agreement. The
Airport must be maintained in a safe, serviceable manner
for public aeronautical purposes only.
• Airport Licensing
• MS 360.018 Subd. 6.Licensing airport or other air navigation facility. All
proposed airports, restricted landing areas, and other air navigation
facilities shall be first licensed by the commissioner before they, or any of
them, shall be used or operated. … It shall be unlawful for any municipality
or officer or employee thereof, or for any person, to operate an airport,
restricted landing area, or other air navigation facility for which the
required annual license has not been issued by the commissioner.
Who sees obstructions identified on the 5010 / Airport Inspection?
• MnDOT Engineers… Who $ Fund $ Projects• FAA ADO Project Managers…
Who $ Fund $ Projects• All of FAA through the
Airport Master Record (AMR)• May affect approach
availability or minimums• Pilots through outlets that
publish AMR data• Pilots may choose to use your
neighbor’s airport
So, you cut down the trees. Now What?
• Someone needs to certify that the obstruction has been removed.• This will typically be a consulting
engineer.• You need to get that information
into the Airport Master Record.• Person submitting information must have
credentials the FAA recognizes.• This takes time (months)• Updates occur on a 56 day cycle, plus
there is delay time for the FAA to review and accept the new information.
The best plan is to remove obstructions BEFORE the inspection!
• No obstructions are less work for the inspectors.• Without obstructions there is no
need hire an engineer to certify that obstructions that aren’t there were properly removed.• Without obstructions there is no
impact to airport approaches.• Without obstructions there is no
delay on getting restrictions to the airport approaches removed.• Pilots don’t know any issues.
Obstructions tend to show up in the same locations year over year
• Look at past inspection reports for trouble areas.• Plan for your next inspection.
MnDOT inspects every three years. • Trees and brush grow at a
predictable rate. We recommendcutting at least 10 feet below the maximum height to allow three years of growth before re-trimming.• Cutting in the winter is easier. Wet
areas may not be accessible in the summer & no bats.
We Have Obstructions –Now What?
We Have Obstructions –Now What?
Quiz Time!
1. Go to www.menti.com
2. Use the code 95 30 81
Answer fast for a higher score!