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has not been notified, or any other MET condition which is likely to affect the safety or
markedly effect the efficiency of other aircraft.
The estimate of next position may be omitted from an AIREP SPECIAL report except
where the report is made at a planned position reporting point.
In the climb-out and approach phases, a pilot in command must report meteorological
conditions, not previously advised, which are likely to affect the safety of aircraft
operations. The preferred format of the report is detailed in ERSA Flight Planning.
SHORT AIREP
Short AIREP should be provided by pilots when requested.
ATS should be advised when a pilot encounters:
• Cloud-unexpected significant variations to amount, base or tops (by reference to
QNH);
• Visibility- reduced due to fog, mist, hail, rain, snow or dust, or improvement
observed;
• Wind- significant variation to forecast;
• Other phenomena - incidence of severe or moderate turbulence, thunderstorms,
moderate or severe icing, hail, line squalls, standing waves or winds of 40KT or more
within 2,000FT of ground level.
The report comprises:
• callsign of the ground station;
• callsign of the aircraft;
• Short AIREP;
• position and time;
• EN ROUTE (departure point ) TO (destination);
• weather report.
152
Civil Aviation Safety Authority Australia
PRE-FLIGHT PLANNING METEOROLOGY
09/2001
2
AIREP
SECTION
GENERAL
A pilot in command must make provision for flight to an alternate aerodrome, when
required, in accordance with the following paragraphs.
When a flight is required to provide for an alternate aerodrome, any aerodrome may
be so nominated for that flight provided that:
• it is suitable as a destination for that flight; and
• is not an aerodrome for which that flight would be required to provide for an
alternate aerodrome.
When an aerodrome forecast is “provisional”, the pilot in command must make
provision for a suitable alternate that has a firm forecast.
WEATHER CONDITIONS
Except when operating an aircraft under the VFR by day within 50NM of the point of
departure, the pilot in command must provide for a suitable alternate aerodrome when
arrival at the destination will be during the currency of, or up to 30 minutes prior to
the forecast commencement of, the following weather conditions:
• cloud- more than 4/8ths below the alternate minimum; or
For flight by aeroplanes under the VFR (day or night) and helicopters
operating under the VFR at night, the alternate minima are a ceiling of
1,500 FT and a visibility of 8KM.
Note: In determining requirements for alternate aerodromes, forecast amounts of cloud
below the alternate minima are cumulative. For determining requirements, the
cumulative cloud amount is interpreted as follows:
FEW plus FEW is equivalent to SCT (ie 4/8ths or less)
FEW plus SCT is equivalent to BKN (ie more than 4/8ths)
SCT plus SCT is equivalent to BKN or OVC (ie more than 4/8ths).
• visibility - less than the alternate minimum; or
• visibility - greater than the alternate minimum, but the forecast is endorsed with a
percentage probability of fog, mist, dust or any other phenomena restricting visibility
below the alternate minima; or
• wind - a crosswind or downwind component more than the maximum for the
aircraft.
Note: Wind gusts must be considered
153
Civil Aviation Safety Authority Australia
PRE-FLIGHT PLANNING ALTERNATE
AERODROMES
09/2001
2
WEATHER CONDITIONS
SECTION
When operating a helicopter under the VFR, and the use of the helicopter VMC is
permissible at the destination, the pilot in command must provide for a suitable
alternate aerodrome when either of the following conditions is forecast at the
destination:
• cloud - more than 4/8ths below a ceiling of 1,000FT; or
• visibility - less than 3,000M
When weather conditions at the destination are forecast to be as specified as above,
but are expected to improve at a specific time, provision for an alternate aerodrome
need not be made if sufficient fuel is carried to allow the aircraft to hold until that
specified time plus 30 minutes.
When weather conditions at the destination are forecast to be above the values
specified above, but additionally, intermittent or temporary deteriorations in the
weather below those values are forecast, provision of an alternate need not be made if
sufficient additional fuel is carried to allow the aircraft to hold for:
• 30 minutes for intermittent deterioration (INTER); and
• 60 minutes for temporary deterioration (TEMPO).
　
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