AMENDMENT 24 to INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES AERONAUTICAL TELECOMMUNICATIONS ANNEX 10 TO THE CONVENTION ON INTERNATIONAL CIVIL AVIATION FOURTH EDITION - APRIL 1955 INTRODUCTION Qa 1 December 1956, the attached pages should be substituted for cor- responding pages of Annex PO. They incorporafe Amendment 24 to Annex 10 which aligns the signification of the signal QB3 to revised meteorological practices in respect of reporting cloud conditions above an aerodrome. INTERNATIONAL CIVIL AVIATION ORGANIZATION
- ' Part I V - Codes and Abbreviations Annex 10 - Aeronautical Tdscomrnunimtions AERONAUTICAL CODE SIGNALS QBA-QBHJ I SIGNIFICATION I QUESTION OR INTERROQATORU FORM I ANSWER, INP'ORMATION OR ADVICE FORM . . . eighths . . . type at . . . f-lgzues and lnz'ts QBA - QBB I "1 103'3. I height above official orrodromc clcv I. Note.-The cloud anzount, type if reported and tirrtical distance information is reported in heqzrenrr cf t-zerl cloud lnyers are present, the order of regorting being from low to hzgh levels in cztcordnncr cith the jllnlry rlnztd layer speczjications What ifi the horizontal vifiibility at . . . place What is the amount, type and height above official aerodrome elevation of the base of the cloud at . . i place I a the foulest individual layer of nny anzount b the next higher individual layer the amount of elhich is threeeighths or inore to the necvest cigfzth'i. C the next higher individual layer the amount of which is jive-eighths or more to the nearrt eighth. The horizontal visibility at . . . place at . . . houe is . . . distance figures and units. The amount, type and height above odtirial aerodrome elevation of the base of the CWOLI at. . . place at . . . hours is I Note.-The information mav be given in Awe. Pomor - QBC - - -. or Q Code foim. When given in Q Code, the following sequence of Q sigtral answer or cedvice forms is used QMX, QNY, W0. WF, W, E"T and QNI. Example QRR CYUL 1300 2 301 IT 3 1500 ET 6 9000 FT - - - . . Report meteorological coilditions a13 ob- served from your aircraft at . . . position or zone at . . . hourfi QBD - OBE QBG I Are you flying above cloud The meteorological conditione as observed from my aircraft at . . . position or zone at . , . hours at . . . figures and ulxits height above . . . datum are . . . QBF QBH I Are you flying below eloud How much fuel have you remaining ex- pressed as hours and/or minutes of consump- tion Are you flying in cloud I am flying in cloud at . . . figures and units height above . . . datum and I am ascend- ing descending to . . . figures and wnits height above that datum. - . - - - Fuel remaining is . .'. hours and/or minzttes of consumption. - - -. - I am about to wind in my aerial. I 1 am flying above cloud and at . . . figures md units height above . . . datum. or Maintain a vertical dietance of . . . figures and units above clond, smoke, ham or fog levels. 1 am flyirrg helow oloud and at . . . figures and units height above . . . datum. or Maintain a vertical dietance of . . . figures and units below cloud.
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