Position 5. Clearance to taxi to hangar line or parking area is issued here.
Position 6. Parking information issued here if necessary.
Note.— See Figures V-1 and V-2.
4.3 A frequency change should not be issued to single-pilot helicopters during emergency situations, air-taxiing, or low-level flight. Whenever possible, control instructions from the next ATS unit should be relayed as necessary until the pilot is able to change frequency.
Note.— Most light helicopters are flown by one pilot and require the constant use of both hands and feet to maintain control during low-altitude/low-level flight. Although flight control friction devices assist the pilot, changing frequency near the ground could result in inadvertent ground contact and consequent loss of control.
5. Selection of runway-in-use
5.1 The term “runway-in-use” shall be used to indicate the runway that at a particular time is considered by a unit providing aerodrome control service to be the most suitable for use by the types of aircraft expected to land or take off at the aerodrome.
5.2 Normally, an aircraft will land and take off into wind unless safety, the runway configuration, or air traffic conditions determine that a different direction is preferable. In selecting the runway-in-use, however, the unit providing aerodrome control service shall take into consideration, besides surface wind speed and direction, other relevant factors such as the aerodrome traffic circuits, the length of runways, and the approach and landing aids available.
5.3 If the runway-in-use is not considered suitable for the operation involved the pilot-in-command may request permission to use another runway.
AERONAUTICAL GROUND LIGHTS
6. Operation
Note.— The procedures in this Section apply to all aerodromes, whether or not aerodrome control service is provided. In addition the procedures in 6.1.1 apply to all aeronautical ground lights, whether or not they are on or in the vicinity of an aerodrome.
6.1 General
6.1.1 All aeronautical ground lights shall be operated, except as provided in 6.1.2 and 6.2:
a) continuously during the hours of darkness or during the time the centre of the sun’s disc is more than 6 degrees below the horizon, whichever requires the longer period of operation, unless otherwise provided hereafter or otherwise required for the control of air traffic;
b) at any other time when their use, based on weather conditions, is considered desirable for the safety of air traffic.
6.1.2 Lights on and in the vicinity of aerodromes that are not intended for en-route navigation purposes may be turned off, subject to further provisions hereafter, if no likelihood of either regular or emergency operation exists, provided that they can be again brought into operation at least one hour before the expected arrival of an aircraft.
V. Aerodrome Control Service
Fig. V-1. Critical positions of aircraft from an aerodrome control tower viewpoint (see 4.2)
Fig. V-2. Typical elements of traffic circuit (see 4.2)
6.1.3 At aerodromes equipped with lights of variable intensity a table of intensity settings, based on conditions of visibility and ambient light, should be provided for the guidance of air traffic controllers in effecting adjustment of these lights to suit the prevailing conditions. When so requested by an aircraft, further adjustment of the intensity may be made whenever possible.
6.2 Approach lighting
Note.— Approach lighting includes such lights as simple approach lighting systems, precision approach lighting systems, visual approach slope indicator systems, circling guidance lights, approach light beacons and runway alignment indicators. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：Rules of the Air and Air Traffic Services(60)
