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necessary, the minimum radar vectoring altitude shall include
a correction for low temperature effect.
Note 1.— 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. Detailed obstacle clearance criteria are contained
in PANS-OPS (Doc 8168), Volume I, Part VI, Chapter 3
(Altimeter Corrections) and Volume II, Part II, Departure
Procedures, Part III, 24.2.2.3 (Procedures based on tactical
vectoring), and Part VI (Obstacle Clearance Criteria for Enroute).
Note 2.— It is the responsibility of the ATS authority to
provide the controller with minimum altitudes corrected for
temperature effect.
8.6.5.3 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.
8.6.5.4 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.
8.6.5.5 In terminating radar vectoring of an aircraft, the
radar controller shall instruct the pilot to resume own navigation,
giving the pilot the aircraft’s position and appropriate
instructions, as necessary, in the form prescribed in 8.6.4.2 b),
if the current instructions had diverted the aircraft from a
previously assigned route.
8.6.6 Navigation assistance
8.6.6.1 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.
8.6.6.2 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
Chapter 8. Radar Services 8-9
1/11/01
weather or unreliable navigational instruments) and shall give
as much information as possible in the circumstances.
8.6.7 Interruption or termination of
radar service
8.6.7.1 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.
8.6.7.2 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.
8.6.8 Minimum levels
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 Chapters 4 and 5; 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.
8.6.9 Information regarding
adverse weather
8.6.9.1 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.
8.6.9.2 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.
Note.— Attention must be given to the fact that under
certain circumstances the most active area of adverse weather
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