BRGHT Altitude Sensitivity

The flight path comparison shows that altitude restrictions below 1,200 ft produce no meaningful relief for Severn communities. This tool explores the BRGHT waypoint proposal in detail: drag the slider to vary the turn altitude from 3,000 to 5,000 ft and instantly see the impact on Ashbrook (primary affected community), Aurora Hills and Bretton Woods (south of Severn Run), and fuel cost. The model suggests ~4,100 ft as the sweet spot where Ashbrook drops below the N65 threshold at commercially immaterial fuel cost.

Drag slider to set BRGHT turn altitude Arc color = Ashbrook noise status Green <60 dBA · Amber 60–65 · Red >65 (N65 threshold) Click any marker for details

BRGHT turn altitude

3,000 ft

762 ft/NM gradient

3,000 ft5,000 ft

Ashbrook — primary receptor

737-800 NG (worst case) —

737 MAX 8 —

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Bretton Woods

737-800 NG (worst case) —

Altitude overhead —

Lateral dist from track —

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Aurora Hills

737-800 NG (worst case) —

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Fuel delta vs WARYN procedure

Extra gallons / flight—

Cost per flight—

Annual (50 dep/day)—

% of fuel load—

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Calibrated to TrueNoise A320 measurement (69.3 dBA, 9 May 2026, post-calibration-correction).
Not a certified FAA AEDT analysis.
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