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all possible circumstances cannot be covered, the pilot’s judgement
must ultimately determine the sequence of actions to be
taken.
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ENR (EN ROUTE) A/L 45 effective 24 NOV 05
1.3.2 If the aircraft is required to deviate from track to avoid weather, and
prior clearance cannot be obtained, an air traffic control clearance
must be obtained at the earliest possible time. In the meantime,
the aircraft must follow the procedures detailed in Sub-section 1.6.
1.3.3 The pilot must advise ATC when a weather deviation is no longer
required, or when a weather deviation has been completed and
the aircraft has returned to its cleared track.
1.4 Weather Deviations – Obtaining Priority From ATC
1.4.1 When a pilot initiates communications with ATC, the requirement
for frequency priority and a rapid response may be indicated by
use of the phrase, “WEATHER DEVIATION REQUIRED”.
1.4.2 A pilot retains the option of initiating communications using the
urgency call “PAN PAN” (preferably spoken three times) to alert all
listening parties of a special handling condition which requires
ATC priority for issuance of a clearance or assistance.
1.5 Weather Deviations – Pilot-Controller Communications
Established
1.5.1 When communications between the pilot and controller (via third
party) is available, the pilot must request clearance to deviate from
track advising, where possible, the extent of the expected deviation.
The controller will then initiate the following:
a. if there is no conflicting traffic in the lateral dimension, issue a
clearance to deviate from track; or
b. if there is conflicting traffic in the lateral dimension, establish
vertical separation and issue a clearance to deviate from track;
or
c. if unable to establish vertical separation, and there is conflicting
traffic in the lateral dimension:
(1) advise the pilot that clearance for the requested deviation
is not available;
(2) provide traffic information about, and to, all affected aircraft;
and
(3) request pilot’s intentions.
Example Phraseology:
“UNABLE (requested deviation), TRAFFIC IS (call-sign, position,
altitude, direction), ADVISE INTENTIONS.”
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ENR (EN ROUTE) A/L 45 effective 24 NOV 05
1.5.2 The pilot must:
a. comply with the ATC clearance issued; or
b. advise ATC of intentions and execute the procedures detailed
in Sub-section 1.6 below; and
c. if necessary, establish voice communications with ATC to expedite
dialogue on the situation.
1.6 Weather Deviations – Revised ATC Clearance Not Obtained
1.6.1 Under the provisions of the rules of the air, and in the interests of
safety to do so, the pilot may deviate from the route or track as necessary.
1.6.2 If a revised air traffic control clearance cannot be obtained and
deviation from track is required to avoid weather, the pilot must
conform with the following:
a. If possible, deviate away from an organised track or route system.
b. Broadcast the following at suitable intervals on the frequency in
use and on 121.5MHZ (as a back-up, the VHF inter-pilot air-toair
frequency 123.45MHZ may be used):
(1) flight identification (operator call-sign),
(2) flight level,
(3) aircraft position including track code or ATS route designator,
and
(4) intentions, including the extent of deviation expected.
c. Watch for conflicting traffic both visually and by reference to
TCAS/ACAS (if equipped).
d. Turn on all exterior lights (commensurate with appropriate operating
limitations).
e. When the deviations are less than 10NM, remain at the level
assigned by ATC.
f. For deviations greater than 10NM, when the aircraft is approximately
10NM from track, initiate a level change based on the
following criteria:
Route Centreline
Track
Deviations >10 NM Level Change
EAST
000 – 179o magnetic
LEFT
RIGHT
DESCEND 300 FT
CLIMB 300 FT
WEST
180 – 359o magnetic
LEFT
RIGHT
CLIMB 300 FT
DESCEND 300 FT
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ENR (EN ROUTE) A/L 45 effective 24 NOV 05

　
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