6.5.2 When vectoring an IFR flight, the radar controller shall issue clearances such that the prescribed obstacle clearance will exist at all times until the aircraft reaches the point where the pilot will resume own navigation.
Note.— When an IFR flight is being vectored, the pilot is often unable to determine the aircraft’s exact position and consequently the altitude which provides the required obstacle clearance.
6.5.3 Whenever possible, minimum vectoring altitudes should be sufficiently high to minimize activation of aircraft ground proximity warning systems.
Note.— Activation of such systems will induce aircraft to
pull up immediately and climb steeply to avoid hazardous
terrain, possibly compromising separation between aircraft.
6.5.4 States shall encourage operators to report incidents involving activations of aircraft ground proximity warning systems so that their locations can be identified and altitude, routing and/or aircraft operating procedures can be altered to prevent recurrences.
6.5.5 In terminating radar vectoring of an aircraft, the radar controller shall instruct the pilot to resume own navi-gation, giving the pilot the aircraft’s position and appropriate instructions, as necessary, in the form prescribed in 6.4.2 b), if the current instructions had diverted the aircraft from a previously assigned route.
VI. Radar Services
6.6 Navigation assistance
6.6.1 An identified aircraft observed to deviate significantly from its intended route or designated holding pattern shall be advised accordingly. Appropriate action shall also be taken if, in the opinion of the controller, such deviation is likely to affect the service being provided.
6.6.2 The pilot of an aircraft requesting navigation assistance from an air traffic control unit providing radar services shall state the reason, (e.g. to avoid areas of adverse weather or unreliable navigational instruments), and shall give as much information as possible in the circumstances.
6.7 Interruption or termination of radar service
6.7.1 An aircraft which has been informed that it is provided with radar service should be informed immediately when, for any reason, radar service is interrupted or terminated.
6.7.2 When the control of an aircraft is to be transferred from a radar controller to a non-radar controller, the radar controller shall ensure that non-radar separation is established between that aircraft and any other controlled aircraft before the transfer is effected.
6.8 Minimum levels
6.8.1 A radar controller shall at all times be in possession of full and up-to-date information regarding:
a) established minimum flight altitudes within the area of responsibility;
b) the lowest usable flight level or levels determined in accordance with Part II and Part III; and
c) established minimum altitudes applicable to procedures based on tactical radar vectoring.
Note.— Criteria for the determination of minimum altitudes applicable to procedures based on tactical radar vectoring are contained in Procedures for Air Navigation Services — Aircraft Operations (PANS-OPS, Doc 8168), Volume II, Part III.
6.9 Information regarding adverse weather
6.9.1 Information that an aircraft appears likely to penetrate an area of adverse weather should be issued in sufficient time to permit the pilot to decide on an appropriate course of action, including that of requesting advice on how best to circumnavigate the adverse weather area, if so desired.
Note.— Depending on the capabilities of the radar system, areas of adverse weather may not be presented on the radar display. An aircraft’s weather radar will normally provide better detection and definition of adverse weather than radar sensors in use by ATS.
6.9.2 In vectoring an aircraft for circumnavigating any area of adverse weather, the radar controller should ascertain that the aircraft can be returned to its intended or assigned flight path within the available radar coverage, and, if this does not appear possible, inform the pilot of the circumstances.
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