Wikis > Infl. Contingencies > Weather deviation procedures
Weather deviation procedures
Note. The following procedures are intended for deviations around adverse meteorological conditions.
- When the pilot initiates communications with ATC, a rapid response may be obtained by stating “WEATHER DEVIATION REQUIRED” to indicate that priority is desired on the frequency and for ATC response. When necessary, the pilot should initiate the communications using the urgency call “PAN PAN” (preferably spoken three times).
- The pilot shall inform ATC when weather deviation is no longer required, or when a weather deviation has been completed and the aircraft has returned to its cleared route.
|ACTIONS TO BE TAKEN WHEN CONTROLLER-PILOT COMMUNICATIONS ARE ESTABLISHED|
ATC should take one of the following actions:
The pilot should take the following actions:
|ACTIONS TO BE TAKEN IF A REVISED ATC CLEARANCE CANNOT BE OBTAINEDNote. The provisions of this section apply to situations where a pilot needs to exercise the authority of a pilot-in-command under the provisions of Annex 2, 2.3.1. (Responsibility of pilot-in-command)|
If the aircraft is required to deviate from track to avoid adverse meteorological conditions and prior clearance cannot be obtained, an ATC clearance shall be obtained at the earliest possible time. Until an ATC clearance is received, the pilot shall take the following actions:
|Route centre line track||Deviations > 19 km (10 NM)||Level change|
000° – 179° magnetic
|DESCEND 90 m (300 ft)|
CLIMB 90 m (300 ft)
180° – 359° magnetic
|CLIMB 90 m (300 ft)|
DESCEND 90 m (300 ft)
Source: ICAO doc 4444
Responsibility of pilot-in-command