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2. Details of broadcasts
e) 2 to 5 minutes, where possible, before a change in flight
level;
2.1 VHF RTF frequency to be used
f) at the time of a change in flight level; and
2.1.1 The VHF RTF frequency to be used should be
determined and promulgated on a regional basis. However, in g) at any other time considered necessary by the pilot.
ANNEX 1 1 ATT C-1 111 1/01
Annex 11 - Air Traffic Services Attachment C
2.4 Forms of broadcast 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 '
2.4.1 The broadcasts other than those indicating changes in the following form:
in flight Icvcl, i.c. thc broadcasts referred to in 2.3 a), b), c),
d) and g), should be in the following form: ALL STATIONS
ALL STATIONS (necessary to identify a traffic information (call sign)
broadcast) (direction)
(call sign) (ATS route) (or DIRECT FROM (position) TO (position))
FLIGHT LEVEL (number) (or CLIMBING* TO FLIGHT LEAVING FLIGHT LEVEL (number) NOW FOR FLIGHT
LEVEL (number)) IAEVEIA(n umher)
(direction) followed by:
(ATS route) (or DIRECT FROM (position) TO (position)) ALL STATIONS
POSITION (position**) AT (time) (call sign)
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)
MAINTAINING FLIGHT LEVEL (number)
2.4.4 Broadcasts reporting a temporary flight level
change to avoid an imminent collision risk should be in thC
following form:
ALL STATIONS
(call sign)
LEAVING FLIGHT LEVEL (number) NOW FOR FLIG*
LEVEL (number)
followed as soon as practicable by:
ALL STATIONS
(call sign)
RETURNING TO FLIGHT LEVEL (number) NOW
2.5 Acknowledgement
of the broadcasts
(direction) The broadcasts should not be acknowledged unless a potentid
collision risk is perceived.
(ATS route) (or DIRECT FROM (position) TO (position))
LEAVING FLIGHT LEVEL (number) FOR FLIGHT
LEVEL (number) AT (position and time) 3. Related operating procedures
* For the broadcast referred to in 2.3 a) in the case of an aircraft taking 3.1 Changes of cruising level
off from an aerodrome located wlthin the lateral limits of the
designated airspace. 3.1.1 Cruising level changes should not be made within
** For broadcasts made when the aircnft is not near an ATS significant the designated airs~acc, considcrcd necessary pilots
point, the position should be given as accurately as possible and in any to avoid traffic conflicts, for weather avoidance or for other
u s e to the nearest 30 minutes of latitude and longitude. valid operational reasons.
111 110 1 ATT C-2
Attachment C
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;
Annex 11 - Air Traffic Services
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,
notifying the action on the appropriate ATS frequency.
3.3 Normal position reporting procedures
Normal position reporting procedures should be continued at
all times, regardless of any action taken to initiate or
acknowledge a traffic information broadcast.
- END -
ATT C-3
ICAO TECHNICAL PUBLICATIONS
The following summary gives the status, and also
describes in general terms the contents of the various
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