Document ID: chunk:federal_register_of_legislation:F2024C01173:reg:6:p1
Version: federal_register_of_legislation:F2024C01173
Segment Type: reg
Provision Reference: reg 6 (pt 1/7)
Character Range: 91948–94786

6                                 An EDTO en-route alternate aerodrome                                                                                    commencing at the earliest estimated time of arrival, and ending at the latest estimated time of arrival, of an aeroplane at the aerodrome

Division 2—Flight preparation (Part 121 alternate aerodrome) requirements

4.06  Certain weather forecast requirements

Application
 (1) The requirements in this section apply when assessing an authorised weather forecast for an aerodrome to determine whether relevant weather conditions are forecast to exist for a flight of an aeroplane.

Cloud
 (2) When determining whether the cloud is more than SCT, the following assumptions must be made:
 (a) forecast amounts of cloud below the cloud ceiling values relevant to a flight of an aeroplane or the landing minima (as the case may be) are cumulative;
 (b) FEW plus FEW is equivalent to SCT;
 (c) FEW plus SCT is equivalent to BKN;
 (d) SCT plus SCT is equivalent to BKN or OVC.

Change indicators
 (3) The following requirements apply when the change indicator BECMG is used in an aerodrome forecast:
 (a) if the weather conditions within the BECMG element of the forecast represent a deterioration in any of the weather elements within the preceding element of the forecast, the change indication is to be applied from the start of the forecast BECMG period;
 (b) if the weather conditions within the BECMG element of the forecast represent an improvement in all of the weather elements within the preceding elements of the forecast, the change indication is to be applied from the end of the forecast BECMG period.
 (4) When an authorised weather forecast includes weather conditions forecast to occur on an intermittent ("INTER") basis, those weather conditions are taken to be present for the entire time period that the forecast includes the change indicator of INTER, unless:
 (a) 30 minutes of holding fuel is carried by the aeroplane for the flight; or
 (b) both of the following apply:
 (i) the period of overlap of the estimated time of use and the time period of the change indicator is less than 30 minutes;
 (ii) holding fuel equal to the number of minutes of the overlap is carried by the aeroplane for the flight; or
 (c) subsection (4B) applies.
 (4A) When an authorised weather forecast includes weather conditions forecast to occur on a temporary ("TEMPO") basis, those weather conditions are taken to be present for the entire time period that the forecast includes the change indicator of TEMPO, unless:
 (a) 60 minutes of holding fuel is carried by the aeroplane for the flight; or
 (b) both of the following apply:
 (i) the period of overlap of the estimated time of use and the time period of the change indicator is less than 60 minutes;
 (ii) holding fuel equal to