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4.7.2 Headings will be passed by using the word “HEADING” followed by the three digits of the magnetic heading. Where a pilot is required to turn through 180 degrees or more the direction of turn will be emphasised by repeating it.
4.7.3 Instructions given by radar controllers will often be designed to establish and maintain radar separation as well as to position aircraft accurately. Pilots must therefore commence a turn immediately the instruction is given at a bank angle of 25° or at a turn rate of 3° per second (Rate 1), whichever requires the lesser angle of bank, and maintain any given heading until otherwise instructed.
4.7.4 When an aircraft is diverted from a previously assigned route, the pilot will be advised, unless it is self evident, of the purpose of the vector. Whenever possible, the limit of the diversion will be specified.
4.7.5 When an IFR aircraft is being vectored, the radar controller is responsible for provision of adequate terrain clearance, and ensuring the aircraft remains within controlled airspace except in an emergency.
4.7.6 When radar vectoring is terminated, other than on the issuance of an approach clearance, the pilot will be instructed to resume own navigation. When necessary, the radar controller will pass position or track and distance information to assist the pilot to return the aircraft to its cleared route.

4.8 Use of Radar in Control Towers
4.8.1 All control towers have the ability to display radar derived information for the benefit of aerodrome controllers, and approach controllers where the unit provides that service. Traffic displayed depends on the radar coverage in the area.
4.8.2 The aerodrome controller’s prime responsibility is visual control of traffic in the vicinity of the aerodrome. The approach controller’s responsibility is the provision of an approach control service by non-radar means to aircraft arriving, departing, and transiting the control zone and any associated control area.
4.8.3 As an adjunct to their service, aerodrome controllers and approach controllers may use radar information to:
(a)  determine the position of aircraft; 
(b)  establish or confirm non-radar separation; and 
(c)  enhance traffic information. 
4.8.4  While a condition of use of radar in non-radar procedures is that 

aircraft are suitably identified by tower controllers, the phrase “identified” will not be used except in relation to the radar identification process that occurs as a result of the instruction “SQUAWK IDENT”.
4.8.5 All pilots should be aware that aircraft are not continuously monitored on radar by the aerodrome controller, pilots will not be advised when radar identity is lost, and a radar control service is not provided from control towers.
4.8.6 To protect IFR flights and to assist pilots of VFR flights to comply with an ATC clearance, VFR pilots may be given a suggested direction to fly. This is not a radar control service and the pilot is still responsible for remaining VFR and navigating the aircraft.

4.9 Speed Requirements Under Radar Control
4.9.1 To facilitate radar control and to reduce the need for radar vectoring, a radar controller may request aircraft to adjust speed in a specified manner. Pilots must comply with any speed instructions unless they are considered unacceptable for safety reasons, in which case ATC must be notified immediately and pilot preferred speed stated.
4.9.2 When speed control is required, it will be applied in a positive manner whereby the controller will allocate a specific speed, a maximum speed, or a minimum speed to be flown. Speed should be maintained to within 10kt of the speed required by ATC.
4.9.3 Speed control will not be applied where severe turbulence is known to exist.
4.9.4 Specific speeds will normally be expressed in multiples of 10kt, expressed as IAS, except that a minimum final approach speed may be specified in 5kt increments.
　
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