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after take-off and be maintained until leaving the airspace.
2.3 Time of broadcasts
A broadcast should be made:
a) 10 minutes before entering the designated airspace or,
for a pilot taking off from an aerodrome located within
the lateral limits of the designated airspace, as soon as
appropriate after take-off;
b) 10 minutes prior to crossing a reporting point;
c) 10 minutes prior to crossing or joining an ATS route;
d) at 20-minute intervals between distant reporting points;
e) 2 to 5 minutes, where possible, before a change in flight
level;
f) at the time of a change in flight level; and
g) at any other time considered necessary by the pilot.
Annex 11 — Air Traffic Services Attachment C
1/11/01 ATT C-2
2.4 Forms of broadcast
2.4.1 The broadcasts other than those indicating changes
in flight level, i.e. the broadcasts referred to in 2.3 a), b), c),
d) and g), should be in the following form:
ALL STATIONS (necessary to identify a traffic information
broadcast)
(call sign)
FLIGHT LEVEL (number) (or CLIMBING* TO FLIGHT
LEVEL (number))
(direction)
(ATS route) (or DIRECT FROM (position) TO (position))
POSITION (position**) AT (time)
ESTIMATING (next reporting point, or the point of
crossing or joining a designated ATS route) AT (time)
(call sign)
FLIGHT LEVEL (number)
(direction)
Fictitious example:
“ALL STATIONS WINDAR 671 FLIGHT LEVEL 350
NORTHWEST BOUND DIRECT FROM PUNTA SAGA TO
PAMPA POSITION 5040 SOUTH 2010 EAST AT 2358
ESTIMATING CROSSING ROUTE LIMA THREE ONE AT
4930 SOUTH 1920 EAST AT 0012 WINDAR 671 FLIGHT
LEVEL 350 NORTHWEST BOUND OUT”
2.4.2 Before a change in flight level, the broadcast
(referred to in 2.3 e)) should be in the following form:
ALL STATIONS
(call sign)
(direction)
(ATS route) (or DIRECT FROM (position) TO (position))
LEAVING FLIGHT LEVEL (number) FOR FLIGHT
LEVEL (number) AT (position and time)
2.4.3 Except as provided in 2.4.4, the broadcast at the
time of a change in flight level (referred to in 2.3 f)) should be
in the following form:
ALL STATIONS
(call sign)
(direction)
(ATS route) (or DIRECT FROM (position) TO (position))
LEAVING FLIGHT LEVEL (number) NOW FOR FLIGHT
LEVEL (number)
followed by:
ALL STATIONS
(call sign)
MAINTAINING FLIGHT LEVEL (number)
2.4.4 Broadcasts reporting a temporary flight level
change to avoid an imminent collision risk should be in the
following form:
ALL STATIONS
(call sign)
LEAVING FLIGHT LEVEL (number) NOW FOR FLIGHT
LEVEL (number)
followed as soon as practicable by:
ALL STATIONS
(call sign)
RETURNING TO FLIGHT LEVEL (number) NOW
2.5 Acknowledgement
of the broadcasts
The broadcasts should not be acknowledged unless a potential
collision risk is perceived.
3. Related operating procedures
3.1 Changes of cruising level
3.1.1 Cruising level changes should not be made within
the designated airspace, unless considered necessary by pilots
to avoid traffic conflicts, for weather avoidance or for other
valid operational reasons.
* For the broadcast referred to in 2.3 a) in the case of an aircraft taking
off from an aerodrome located within the lateral limits of the
designated airspace.
** For broadcasts made when the aircraft is not near an ATS significant
point, the position should be given as accurately as possible and in any
case to the nearest 30 minutes of latitude and longitude.
Attachment C Annex 11 — Air Traffic Services
ATT C-3 1/11/01
3.1.2 When cruising level changes are unavoidable, all
available aircraft lighting which would improve the visual
detection of the aircraft should be displayed while changing
levels.
3.2 Collision avoidance
If, on receipt of a traffic information broadcast from another
aircraft, a pilot decides that immediate action is necessary to
avoid an imminent collision risk, and this cannot be achieved
in accordance with the right-of-way provisions of Annex 2, the
pilot should:
a) unless an alternative manoeuvre appears more appropriate,
immediately descend 150 m (500 ft), or 300 m (1 000 ft)
if above FL 290 in an area where a vertical separation
minimum of 600 m (2 000 ft) is applied;
b) display all available aircraft lighting which would
improve the visual detection of the aircraft;
c) as soon as possible, reply to the broadcast advising
action being taken;
d) notify the action taken on the appropriate ATS
frequency; and
e) as soon as practicable, resume normal flight level,
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