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passing the significant point.
Item 5 — NEXT POSITION AND ESTIMATED TIME OVER. Report the
next reporting point and the estimated time over such reporting point, or report
the estimated position that will be reached one hour later, according to the
position reporting procedures in force. Use the data conventions specified in
Item 2 for position. Report the estimated time over this position. Report time in
hours and minutes UTC (4 numerics) unless reporting time in minutes past the
hour (2 numerics) as prescribed on the basis of regional air navigation
agreements.
Item 6 — ENSUING SIGNIFICANT POINT. Report the ensuing significant
point following the “next position and estimated time over”.
Section 2
Item 7 — ESTIMATED TIME OF ARRIVAL. Report the name of the
aerodrome of the first intended landing, followed by the estimated time of arrival
at this aerodrome in hours and minutes UTC (4 numerics).
Item 8 — ENDURANCE. Report “ENDURANCE” followed by fuel
endurance in hours and minutes (4 numerics).
Section 3
Item 9 — AIR TEMPERATURE. Report “TEMPERATURE PLUS” or
“TEMPERATURE MINUS” followed by the temperature in degrees Celsius (2
numerics), corrected for instrument error and airspeed (e.g. TEMPERATURE
MINUS 05).
Item 10 — WIND DIRECTION.
Item 11 — WIND SPEED. Report spot wind referring to the position given
in Item 2. Report wind direction in degrees true (3 numerics) and wind speed
in kilometres per hour or knots (2 or 3 numerics) (e.g. WIND 345 DEGREES 55
KILOMETRES PER HOUR, WIND 170 DEGREES 65 KNOTS). Report calm
conditions as “CALM”.
Item 12 — TURBULENCE. Report severe turbulence as “TURBULENCE
SEVERE”, moderate turbulence as “TURBULENCE MODERATE” and light
turbulence as “TURBULENCE LIGHT”.
The following specifications apply:
Light — Conditions less than moderate turbulence. Changes in
accelerometer readings less than 0.5 g at the aircraft’s centre of
gravity.
Moderate — Conditions in which moderate changes in aircraft attitude
and/or altitude may occur but the aircraft remains in positive control
at all times. Usually, small variations in air speed. Changes in
accelerometer readings of 0.5 g to 1.0 g at the aircraft’s centre of
gravity. Difficulty in walking. Occupants feel strain against seat belts.
Loose objects move about.
Severe — Conditions in which abrupt changes in aircraft attitude and/or
altitude occur; aircraft may be out of control for short periods. Usually,
large variations in air speed. Changes in accelerometer readings
greater than 1.0 g at the aircraft’s centre of gravity. Occupants are
forced violently against seat belts. Loose objects are tossed about.
Item 13 — AIRCRAFT ICING. Report severe icing as “ICING SEVERE”,
moderate icing as “ICING MODERATE” and light icing as “ICING LIGHT”.
The following specifications apply:
Light — Conditions less than moderate icing.
Moderate — Conditions in which change of heading and/or altitude may be
considered desirable.
Severe — Conditions in which immediate change of heading and/or altitude
is considered essential.
Item 14 — HUMIDITY. Report the relative humidity, if available, as
“HUMIDITY” followed by the relative humidity in per cent (3 numerics) (e.g.
HUMIDITY 085).
Item 15 — PHENOMENON PROMPTING A SPECIAL AIR-REPORT.
Report one of the following phenomena encountered or observed:
• severe turbulence as “TURBULENCE SEVERE”
Specifications under Item 12 apply.
• severe icing as “ICING SEVERE”
Specifications under Item 13 apply.
• severe mountainwave as “MOUNTAINWAVE SEVERE”
The following specification applies:
severe — conditions in which the accompanying downdraft is 3.0 m/s
(600 ft/min) or more and/or severe turbulence is encountered.
A1-4 Air Traffic Management (PANS-ATM)
1/11/01
• thunderstorm without hail as “THUNDERSTORM”
• thunderstorm with hail as “THUNDERSTORM WITH HAIL”
The following specification applies:
Only report those thunderstorms which are:
• obscured in haze; or
• embedded in cloud; or
• widespread; or
• forming a squall-line.
• heavy duststorm or sandstorm as “DUSTSTORM or SANDSTORM
HEAVY”
• volcanic ash cloud as “VOLCANIC ASH CLOUD”
• pre-eruption volcanic activity or a volcanic eruption as “PREERUPTION
　
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