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<br />Proposals for Revising Northern California Metroplex – Alameda County/Contra Costa County 28 <br />Figure 15: Published QUIET SEVEN departure out of SFO. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />NIITE THREE DEPARTURE NOISE ISSUES: <br /> <br />QUIET was designed for noise abatement and kept aircraft over the water during the lower portion <br />of the aircraft climb profile. The current SFO NIITE procedure eliminated the charted heavy line to <br />REBAS that was published under QUIET. The elimination may have allowed greater discretion for <br />early turns prior to aircraft reaching the REBAS waypoint and greatly undermining noise abatement. <br /> <br />Analysis of aircraft flying NIITE shows the overwhelming majority are currently allowed early turns <br />instead of flying the route as charted to REBAS. This places aircraft at least 1000 to 5000 feet lower <br />in altitude during nighttime hours over densely populated areas in Oakland, Berkeley, and other <br />communities. In the early morning and late night hours, aircraft noise is especially disruptive given <br />the low ambient noise levels which have been measured to drop as low as 29 dBA in the Montclair <br />residential area in the hills of Oakland. <br />220