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PRE-FLIGHT PLANNING PREPARATION
09/2001
2
FLIGHT INFORMATION SERVICE
SECTION
AERODROME WEATHER INFORMATION BROADCASTS (AWIB)
Broadcasts of actual weather conditions may be made on navigation aids from AWS
sites which use BoM AWS equipment or specific AWS that have met BoM standards
for acceptance into the BoM network.
Basic AWS's provide wind direction and speed, temperature, humidity, pressure setting
and rainfall. Advanced AWS's provide automated cloud and visibility elements which
will be appended to the meteorological report as remarks, for guidance
only.Information provided in AWIB broadcasts is in similar format to that of an ATIS
broadcast and will contain some of the following additional information:
• test transmissions are identified as “TEST”
• station identifier as a plain language station name
• identifier “AWS AERODROME WEATHER”
• wind direction in degrees Magnetic and speed in Knots
• altimeter setting (QNH)
• temperature in whole degrees Celsius
• low cloud below 12,500FT (*)
• visibility (*)
• dew point in whole degrees Celsius (**)
• percentage relative humidity (**) and
• rainfall over the previous ten minutes (**)
(*) Provided from advanced AWS as guidance material (See page 132 for information
on cloud and visibility output)
(**) Provided as supplementary information
Information broadcast from the AWS specified above is is considered to be “real time”
data. When information is not available about a particular item, either because of
invalid data or an inoperative sensor, the element of the broadcast will be identified as
“CURRENTLY NOT AVAILABLE”; eg, “TEMPERATURE CURRENTLY NOT AVAILABLE”.
The integrity of the barometric system in BoM accepted AWS is such that they are
an approved source of QNH. Therefore, QNH from these AWS's may be used in
accordance with ENR 1.5 para 5.4 to reduce the published minima for DME arrival
procedures, and the published landing, circling and alternate minima. Information
derived from other sensors within the AWS, eg wind and temperature, does not have
the same degree of integrity and should be used at pilot discretion.
When AWIB information is available after the hours of control tower staff and the
aerodrome is uncontrolled, reference will be made to its availability in ATIS ZULU.
The availability of AWIB is contained in ERSA FAC information for appropriate
locations.
122
Civil Aviation Safety Authority Australia
PRE-FLIGHT PLANNING PREPARATION
09/2001
2
FLIGHT INFORMATION SERVICE
SECTION
ON REQUEST SERVICE - FLIGHTWATCH
FLIGHTWATCH is the generic radio callsign on the On-request Service to respond to
in-flight requests for operational information from pilots operating in all classes of
airspace.
FLIGHTWATCH is provided on FIS frequencies; however, aircraft operating in CTA
outside the range of a FIS VHF outlet may request operational information on the ATC
frequency in use. Due to workload considerations, ATC may require that pilots request
the information on an HF FIS frequency.
When requesting information, pilots must include the frequency on which they
are calling; eg ‘FLIGHTWATCH, PAPA GOLF KILO, ONE TWO THREE DECIMAL ONE,
REQUEST ACTUAL WEATHER SYDNEY”
FLIGHTWATCH will respond with information in an abbreviated form, paraphrased into
brief statements of significance. The full text of messages will be provided on request.
FLIGHTWATCH frequencies and their distribution are shown at ERSA GEN.
HAZARD ALERT SERVICE
Hazard Alerts contain information, assessed by ATS to be of an unexpected and critical
nature, that could assist pilots to avoid hazardous situations. Hazard Alerts will be:
• broadcast on the appropriate ATS frequencies in the hour following the observed or
notified onset of the conditions and, as necessary,
• directed to those aircraft maintaining continuous communications with ATS (at the
time the hazard is assessed) that are within one hour flight time of the hazardous
condition.
Hazard Alerts include:
• SIGMET,
• AIRMET,
• observations, pilot reports, or amended forecasts indicating that weather conditions
at the destination have unexpectedly deteriorated below the IFR or VFR alternate
minima, and any additional information that could possibly assist the pilot in the
avoidance of hazardous situations.
Hazard Alert Information, or its availability, will be directed or broadcast on the
appropriate ATS frequencies; eg
“ALL STATIONS HAZARD ALERT MELBOURNE. WEATHER OBSERVATION NOTIFIES
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VFR Flight Guide(120)
