Phraseology RTF 3 Transmission of Numbers papavasileiou Objective

Phraseology RTF 3 Transmission of Numbers papavasileiou

Objective To ensure an understanding of the use of numbers in RTF and the method of their transmission papavasileiou

Phraseology 0 1 2 3 4 5 6 7 8 9 pronounced “ “ “ “ “ papavasileiou ZE-RO WUN TOO TREE FOW-er FIFE SIX SEV-en AIT NIN-er

Phraseology Decimal pronounced DAY-SEE-MAL Hundred “ HUN-dred Thousand “ TOU-SAND papavasileiou

Numbers (1) All numbers used in the transmission of: Altitude Cloud height Visibility RVR a) containing whole hundreds & thousands transmitted by pronouncing each digit in the number of hundreds or thousands (followed by ‘hundred’/ ‘thousand’ as appropriate) e. g. 600 5000 13000 ‘six hundred’ ‘five thousand’ ‘one three thousand’ papavasileiou

Numbers (2) b) Combinations of thousands and whole hundreds transmitted by pronouncing each digit in the number of thousands followed by the number of hundreds e. g. 2500 ‘two thousand five hundred’ 8400 ‘eight thousand four hundred’ 11500 ‘one thousand five hundred’ papavasileiou

General Numbers All other numbers shall be transmitted by pronouncing each digit separately: e. g. 10 467 17893 ‘one zero’ ‘four six seven’ ‘one seven eight nine three’ papavasileiou

Aircraft Callsigns BAW 256 = ‘Speedbird two five six’ AFR 300 = ‘Air France three zero’ DLH 2000 = ‘Lufthansa two zero’ papavasileiou

Flight Levels FL 130 = ‘Flight level one three zero’ FL 200 = ‘Flight level two zero’ FL 245 = ‘Flight level two four five’ papavasileiou

Altimeter Setting 1012 = ‘QNH one zero one two’ 1000 = ‘QNH one zero’ 999 = ‘QNH nine’ papavasileiou

Transponder Codes A 2012 = ‘Squawk two zero one two’ A 4600 = ‘Squawk four six zero’ A 6000 = ‘Squawk six zero’ papavasileiou

Wind Velocity 200º/70 kt = 120º/18 kt = gusting 30 kt ‘Wind two zero degrees seven zero knots’ ‘Wind one two zero degrees one eight knots, gusting three zero knots’ papavasileiou

Phraseology Numbers containing a decimal point shall be transmitted with the decimal point in the appropriate sequence being indicated by the word DECIMAL. e. g. 100. 3 = ‘one zero decimal three’ 3814. 9 = ‘three eight one four decimal nine’ papavasileiou

VHF Comms Indication of Transmitting Channel a) All six digits of numerical TX channel in VHF comms should be used - except b) In the case of both 5 th/6 th digits being zeros, a single zero should be used. e. g. a) 118. 005 = ‘one eight decimal zero five’ b) 118. 000 = ‘one eight decimal zero’ papavasileiou

VHF Comms However! a) In airspace where all VHF comms channels separated by 25 k. Hz+ and use of six digits not substantiated by AATSA, first five digits should be used to identify TX frequency, except b) In the case of these being two zeros, a single zero should be used. e. g. a) 118. 025 = ‘one eight decimal zero two’ b) 118. 000 = ‘one eight decimal zero’ papavasileiou

VHF Comms 8. 33 k. Hz spacing: 118. 010 = ‘one eight decimal zero one zero’ 118. 035 = ‘one eight decimal zero three five’ 118. 055 = ‘one eight decimal zero five’ e. g. ‘AAL 346 contact RHEIN RADAR (132. 330) one three two decimal three zero’ papavasileiou

Transmission of Time Ø When transmitting time, only the minutes of the hour are normally required. Ø Each digit should be pronounced separately. (However, the hour should be included when any possibility of confusion is likely to result) e. g. 0850 h = ‘five zero’ or ‘zero eight five zero’ 1236 h = ‘three six’ or ‘one two three six’ papavasileiou

IANS ATC The End papavasileiou