Document ID: chunk:federal_register_of_legislation:F2025C00187:reg:3:p3
Version: federal_register_of_legislation:F2025C00187
Segment Type: reg
Provision Reference: reg 3 (pt 3/7)
Character Range: 123606–126465

authorised weather forecast used to satisfy the requirement under subparagraph (1) (a) (ii) must be valid for at least 30 minutes before, and 60 minutes after, the planned ETA.

7.03 Flights unable to obtain an authorised weather forecast before departure
       (1) Despite subsection 7.02 (1), an aircraft may commence a flight if:
(a) an authorised weather forecast or an authorised weather report for the flight is not available; and
(b) the pilot in command reasonably considers that the weather conditions at the departure aerodrome will permit the aircraft to return and land safely at the departure aerodrome within 1 hour after take-off.
       (2) The pilot in command of a flight mentioned in subsection (1) (other than a flight that is a Part 121 operation) must return to the departure aerodrome if:
(a) the authorised weather forecast required for the planned destination aerodrome is not obtained within 30 minutes after take-off; and
(b) the pilot in command has not nominated a destination alternate aerodrome if required to do so by subsection 8.04 (3).
       (3) The pilot in command of a flight that is a Part 121 operation must return to the departure aerodrome if the authorised weather forecasts required to satisfy the requirements under regulation 121.170 of CASR (Flight preparation (Part 121 alternate aerodromes) requirements) are not obtained within 30 minutes after take-off.

CHAPTER 8 FLIGHT PREPARATION (ALTERNATE AERODROMES) REQUIREMENTS

Division 8.1 Purpose and definitions

8.01 Purpose
        For subregulation 91.235 (1), this Chapter prescribes requirements relating to flight preparation and alternate aerodromes (the flight preparation (alternate aerodrome) requirements).

8.02 Definition of relevant weather conditions
       (1) Subject to subsection (2), in this Chapter:
relevant weather conditions means the following weather conditions:
(a) for cloud — more than SCT below the alternate minima;
       Note   For alternate minima see section 8.08.
(b) for visibility — either:
           (i) less than the alternate minima; or
           (ii) equal to or more than the alternate minima but with a forecast of at least a 30% probability of fog, mist, dust or any other phenomenon restricting visibility below the alternate minima;
(c) for wind — a headwind, crosswind or downwind component more than the maximum for the aircraft;
(d) a thunderstorm or associated severe turbulence, or a forecast of at least a 30% probability of such an event.
       (2) The definition in subsection (1) may be read as if there were no mention of probabilities in subparagraph (1) (b) (ii) and paragraph (1) (d), but only if:
(a) flight planning for a flight is based on a TAF3; and
(b) the ETA of the flight is within the first 3 hours of the TAF3 validity period; and
(c) the ETA does not fall outside the end time (if any)