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continue straight out to San Tin before making their turn, a total of 87.5 percent of northeasterly departures assumed to use this route with 12.5 percent continuing the straight-out departure beyond this point.
If all other assumptions from the initial operating option (Figure 3-1) remain the same, then the areas exposed to 25 and 30 NEF are estimated to be those shown in Figure 4-1. The effect of this change is to increase noise exposure in the San Tin area and areas toward Fanling in the Northeast New Territories while reducing exposure in the vicinity of Fairview Park.
Operators would undoubtedly prefer availability of this turn south from runway F 1 with Scheme "A" to minimize route mileage. Capacity impact to Scheme "A" is negligable. Were Scheme "B" to be developed, some method to improve departure track separation would be desirable and a turn from runway F2 over the Tai Lam Chung reservoir area would be desirable during busy periods when the airport is operating near capacity.
4.1.2 Northeast Nighttime Departure Restrictions:
Runway D Only, and No Early Turn Southward
This option would attempt to balance noise exposures between the absence of any restrictions on the early turn and its complete elimination. For this option, all nighttime northeasterly departures were assigned to Runway D and these departures were restricted from using the early turn. All other assumptions remained the same, including daytime early southward turn departures, with one exception. In this case, and in the following case, the early turn flight track was adjusted slightly to more accurately represent expected flight tracks of average aircraft rather than that of heavier, slower turning aircraft alone. This adjustment also begins to indicate the type of effect which a consciously applied program of minimizing Fairview Park overflights would have on reducing noise exposure in that
area.
The 25 and 30 NEF contours for this option are shown in Figure 4-2.
Note that fairly minor impacts in the Tin Shui Wai and Fairview Park areas may be expected from this option, but the new residential development limit still extends through San Tin.
Operators are likely to accept a nighttime requirement to use only runway D for northeast departures. Capacity would be reduced at night, but forecasts indicate very low demand levels for nighttime operations. In general terms, restrictions along these lines would not reduce the capability of the replacement airports' ability to achieve its' objectives.
4.1 3 No Northeast Nighttime Operations
A measure which reduces noise exposure to the northeast of the airport altogether, but which has severe operational difficulties in implementing, is the complete elimination of departures to, and approaches from, the northeast at night. If weather permitted, nighttime activity would be assigned southwesterly
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