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Plea For The Trees ® Louisville,KY 40205



History of the Bowman Field Safety Program
The LRAA's 2008 update of the Bowman Field Airport Layout Plan required this planning document to reflect the traditional airspace protection surfaces established under FAA regulations regarding objects affecting navigable airspace (found at 14 Code of Federal Regulations Part 77). Additional airspace safety requirements - defined as "TERPS," Terminal Instrument Procedures - are also required by FAA to be evaluated in the updated planning process. TERPS are specified in FAA Order 8260.3B and are used to design airport-specific procedures for pilots when they use cockpit instruments (as opposed to visual observation) to fly into and from airports. TERPS is also applied in reverse, as in this case, to evaluate obstructions into airspace that might pose hazards to air navigation under existing or planned instrumentation procedures. The "ideal" minimum take-off gradient for aircraft departures under TERPS is to climb 200 feet for every 6,076 ft. (nautical mile). A 40:1 flight path ratio (flying 40 ft. of horizontal distance for every 1 ft. of vertical distance) from a departure runway end provides the obstruction clearance necessary to meet the 200 ft./nautical mile ideal. (See attached diagram: Airspace Surfaces Profile.) At this climb ratio, for example, at 0.5 miles (2,420 ft.) from a departure runway end, a tree that is more than 60-ft. high would intrude into the TERPS minimum take-off gradient, thus encroaching into the airspace sought to be protected during flights when pilots use cockpit instrumentation, such as low-visibility weather conditions.

LRAA hired the Hanson Engineering consulting team in July 2012 to perform an airspace study to identify trees and human-made structures that intrude into airspace heights sought to be protected by the TERPS departure elevation.  The Hanson study (Airspace Study) was submitted to the FAA for review in May 2013. FAA then determined that the TERPS approach elevation would be applied instead.  At a 20:1 ratio, the TERPS approach resulted in fewer trees targeted for removal.  After completion of FAA's review in fall 2013, the FAA curtailed night flights into the airport on Runway 24, but lifted the ban after over 50 trees at the Big Spring Country Club were logged to the ground or trimmed in late 2013. For the rest of the runways, FAA determined which obstructions posed a "hazard" to air navigation. Mitigation options could have included complete removal of trees, tree trimming, marking or lighting, changing flight departure procedures, raising the height of the OCS, or seeking a waiver of the TERPS requirements from the FAA. However, FAA and LRAA focused only on tree removal. 

See most recently published maps of affected areas and table of direct impact areas (cities, neighborhoods, streets, parks, golf courses): Maps of Affected Areas

See the LRAA's website at www.flylouisville.com/bowman-field/meetings-and-events/ for more information.

See the LRAA's Airport Layout Plan: Bowman Field ALP
(Warning: large file; may take several minutes to download)​


For more info see the following links:

October 5, 2016 - FAA sends response to FitzGerald/Barras letter of 09-16-16; 
see FAA Letter of 10-05-16

September 16, 2016 - Tom FitzGerald and Leslie Barras present cease and desist letter to FAA; see FitzGerald/Barras letter of 09-16-16

Understanding Airspace, Objects, and Their Effects on Airports 
(2010 Report Sponsored by FAA)
http://onlinepubs.trb.org/onlinepubs/acrp/acrp_rpt_038.pdf
(This is a lengthy, but reader-friendly, explanation of FAA's multiple standards for airspace protection. Even if you read only the first 24 pages, you'll learn helpful info.)

LRAA authorizes Hansen Professional Services to proceed with FAA's Environmental Assessment (02-19-14); see Task Order No. 4 

LRAA issues RFQ (04-09-12); see Request for Qualifications (note: RFQ makes no reference to Section 106 Historic Landscape Review)

LRAA selects Hanson Professional Services, Inc. (06-20-12); see Hanson Consulting Team

LRAA approves first year scope of work (07-19-12); see Scope of Work; Tom FitzGerald presents letter to LRAA Board on behalf of PFTT outlining expectations; see FitzGerald Letter 07-19-12

September 10, 2012 - Tom FitzGerald and Leslie Barras present letter to FAA and LRAA further outlining expectations; see FitzGerald/Barras Letter 09-10-12. FAA responds to FitzGerald/Barras letter of 09-12-1; see FAA Letter 09-12-12 

LRAA Commitment To Not Acquire Avigation Easements Until Required Studies Done
LRAA Commitment Letter 02-29-12 

FAA brochure on "Wide Area Augmentation System" (WAAS)
Wide Area Augmentation System

Additional FAQ, Airspace Surface Diagram, and TERPS Departure Surface Boundaries
Bowman Field FAQ, Diagram, TERPS Map 01-19-12

Understanding Airspace, Objects, and Their Effects on Airports 
(2010 Report Sponsored by FAA)
http://onlinepubs.trb.org/onlinepubs/acrp/acrp_rpt_038.pdf
(This is a lengthy, but reader-friendly, explanation of FAA's multiple standards for airspace protection.  Even if you read only the first 24 pages, you'll learn helpful info.)
© Mike Hayman
This tree off Pee Wee Reese Rd. is threatened with topping or complete removal.