Article 40 - Chapter 100 Map Change Information

This article proposes to amend the Airport Approach Protection General Bylaw by updating the existing map reference in the Airport Approach Zone definition. Chapter 100 was first enacted in 1958 to prevent the creation of Airport Hazards.  The definition of the “Airport Approach Zone” included a reference to a February 1958 Map on file with the Chatham Town Clerk.  That February 1958 map is now outdated.  Since 1958 there have been several changes to the airspace used by aircraft arriving and departing the airport, including: regulatory input from the Federal Aviation Administration (FAA) through its publication of Advisory Circulars (ACs) and safety improvements represented in the FAA approved Airport Layout Plan (ALP). These changes implement the Airport Commission’s ongoing efforts to improve safety for pilots, aircraft passengers and everyone on the ground in the Airport’s vicinity. The 1958 Map needs to be replaced with a map reflecting the reality of aircraft arrivals and departures today. As noted in the Article, a positive vote will result in the map of record changing to an updated “Map of Approach Zones Chatham Airport, Chatham, Massachusetts, dated March 2024.”

The substitution of this new map reconciles Airport Approach Zone areas with current runway conditions, Airport Layout Plan (ALP) features and FAA Advisory Circulars. This new, revised surface shape maintains the existing 20 to 1 vertical slope of the 1958 Map surface areas and does not change the glide slope. The configuration in the March 2024 Map comports with the FAA’s “Surface 4” in AC 150/5300-138-Table 3-3 (Revised 3/31/22). The Airport Approach Zones are distinct and separate from the Runway Protection Zones or “RPZ”, which are two-dimensional, surface areas intended to enhance protection of people and property on the ground within 1,200 linear feet from the end of each runway.

Current text of Chapter 100 Bylaw

Informational Mailing

  1. Chapter 100 Map Change Mailing List
  2. Chapter 100 Yellow Map 1958 2024 Approaches

Supporting Documents

  1. 2024 ATM WARRANT Excerpt Article 40
  2. March 2024 Chapter 100 Map WARRANT VERSION
  3. May 7, 2024 - Chapter 100 Proposed General Bylaw Changes Public Hearing Presentation (PDF)
  4. February 1958 Approach Bylaw Map

INTERACTIVE MAP VIEWER

https://mapsonline.net/peopleforms/mo4/index.php?site_id=4314

By using this Interactive Map Viewer residents and property owners can view their parcel of interest in relation to the existing 1958 Approach Zones and the location of the 2024 Approach Zones.  Using the Find Tab on the upper left corner, users can enter property information to zoom to the parcel of interest and then using the layers tab can activate the “2024 Surface 4 Approach” and/or the “1958 Approach” layers to view that parcels locational relationship with the existing and proposed surfaces. If after picking the desired layer(s) the selected parcel (indicated in yellow) does not indicate approach surface boundaries within the view, by using “zoom out” functionality (either the “-“symbol on upper right of the view or “rolling back” using your mouse) that parcel’s location in reference to the Approach Zones can be viewed.