SANAC Issue Paper #6

ISSUE: Increase the glide slope angle and reduce aircraft power settings

BACKGROUND: At the May 12, 1998 SANAC meeting this issue was one of thirty-eight issues brought forward as a noise reduction idea by members of the public.

ANALYSIS/DISCUSSION: The glide slope for the instrument landing system (ILS) at Sanford is 3 degrees.  Three degrees is also the national standard for instrument approaches nation-wide.  An attempt was made by the Sanford Airport Authority to increase the glide slope to three and one half (3 1/2) degrees.  This increased glide slope would provide additional altitude at every point along the entire length of the final approach and allow aircraft to carry a reduced power setting and therefore reduce aircraft generated adverse noise.  A request was forwarded to the FAA for consideration and approval.

Unfortunately the FAA disapproved of the request based on the fact that 3 degrees is the national standard for final approach glide slopes.

CONCLUSION: Continue to work with the community to find alternate means to reduce aircraft generated noise.

RECOMMENDATION: None.

SUB-COMMITTEE MEMBERS: Sanford Airport Authority

DATE PREPARED: November 12, 1999