Page 293 - Planning and Design of Airports

254 Airp o r t D e sign

movable objects of 0.1 the wingspan plus 10 ft or (0.1)(156.1) + 10 = 25.6 ft. This
results in a parking position for this aircraft being 156.1 + 25.6 = 182 ft wide by
182 ft long. The MD-87 requires a clearance of (0.1)(107.84) + 10 = 20.8 ft. This
results in a parking position for this aircraft being 107.84 + 20.8 = 129 ft wide.
From Table 6-28 this aircraft may be parked as close to 15 ft to the concourse
since it is in airplane design group III. This results in the length of a parking
position for the MD-87 being 130.42 + 15 = 146 ft. However, since the parking
position for the 767-200 is longer, the actual length provided for the MD-87
is 182 ft.
For aircraft to be moved from their parking positions onto the apron taxilane a
separation from the inside edge of the last gate position to the terminal building
equal to the fuselage length plus 0.1 times the wingspan plus 10 ft is required.
This should allow the aircraft to turn onto the centerline of the taxilane from its
gate position and also allow another aircraft to gain access to the gate position
before the last aircraft at that gate leaves the apron area. The parking arrange-
ment shown in Table 6-13 shows the MD-87 as the closest aircraft to the terminal
building. Therefore, the distance from the centerline of the last gate position to
the terminal building is 130.42 + 54 + (0.1)(107.83) + 10 = 206 ft.
The design must ensure that the clearances provided are adequate based upon
the turning capability of the design aircraft. The analyst should verify using the
procedures discussed earlier in this chapter that the tracking-in of the aircraft
while making a turn from the taxilanes to the parking position will not com-
promise safe clearances between aircraft. The analyst must also verify for each
aircraft that the turning to access gate positions will ensure that no part of the
aircraft will compromise these safe clearances.
Using the above dimensions results in a ramp length of 726 ft. The dimensions
for all aircraft parking positions or gates are shown in Fig. 6-42.
The terminal apron area for these eight aircraft becomes equal to (778)(726) =
565,800 ft , which is equal to about 13 acres or a total ramp area per aircraft of
2
2
about 1.6 acres. A gate for a 767-200 is (182)(182) = 33,100 ft , which is about
0.75 acres. The required gate for an MD-87 is (129)(146) = 18,800 ft which is
2
slightly more than 0.4 acres. Useful rules-of-thumb which allow one to estimate
terminal apron gate requirements are a total ramp area of from 1.5 to 2.0 acres
per aircraft gate, and an area of from 0.75 to 1.0 acres per gate for a wide-bodied
aircraft gate position and an area of about 0.5 acres per gate for a narrow-bodied
aircraft gate position.
Terminal Apron Surface Gradients
For fueling, ease of towing and aircraft taxiing, apron slopes or grades
should be kept to the minimum consistent with good drainage
requirements. Slopes should not in any case exceed 2 percent for util-
ity airports and 1 percent for transport airports. At gates where air-
craft are being fueled every effort should be made to keep the apron
slope within 0.5 percent.

Control Tower Visibility Requirements
At airports with a permanent air traffic control tower, the runways
and taxiways must be located and oriented so that a clear line of sight
is maintained to all traffic patterns, the final approaches to all run-
ways, all runway structural pavements, all apron taxiways, and other