The Civil Aviation (Units of Measurement to be used in Air and Ground Operations), Regulations 2018

Section 1. Citation Section These Regulations may be cited as the Civil Aviation (Units of Measurement to be used in Air and Ground Operations), Regulations.

Section 2. Interpretation Section In these Regulations, unless the context otherwise requires— “ampere (A)” means that constant electric current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in a vacuum, would produce between these conductors a force equal to 2 × 10 -7 newton per metre of length; “becquerel (Bq)” means the activity of a radionuclide having one spontaneous nuclear transition per second; “candela (cd)” means the luminous intensity, in the perpendicular direction, of a surface of 1/600 000 square metre of black body at the temperature of freezing platinum under a pressure of 101 325 newtons per square metre; “celsius temperature (t°C)” means the Celsius temperature is equal to the difference t°C = T-T 0 between two thermodynamic temperatures T and T 0 where T 0 equals 273.15 Kelvin; “coulomb (C)” means the quantity of electricity transported in 1 second by a current of 1 ampere; “degree celsius (°C)” means the special name for the unit Kelvin for use in stating values of Celsius temperature; “farad (F)” means the capacitance of a capacitor between the plates of which there appears a difference of potential of 1 volt when it is charged by a quantity of electricity equal to 1 coulomb; “foot (ft)” means the length equal to 0.3048 metre exactly; “gray (Gy)” means the energy imparted by ionizing radiation to a mass of matter corresponding to 1 joule per kilogram; “henry (H)” means the inductance of a closed circuit in which an electromotive force of 1 volt is produced when the electric current in the circuit varies uniformly at a rate of 1 ampere per second; “hertz (Hz)” means the frequency of a periodic phenomenon of which the period is 1 second; “human performance” means human capabilities and limitations which have an impact on the safety and efficiency of aeronautical operations; “joule (J)” means the work done when the point of application of a force of 1 Newton is displaced a distance of 1 metre in the direction of the force; “kelvin (K)” means a unit of thermodynamic temperature which is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water; “kilogram (kg)” means the unit of mass equal to the mass of the international prototype of the kilogram; “knot (kt)” means the speed equal to 1 nautical mile per hour; “International System of Units (SI)” means a complete, coherent system which includes three classes of unit’s base units, supplementary units; and derived units; “litre (L)” means a unit of volume restricted to the measurement of liquids and gases which is equal to 1 cubic decimeter; “lumen (lm)” means the luminous flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela; “lux (lx)” means the illuminance produced by a luminous flux of 1 lumen uniformly distributed over a surface of 1 square metre; “metre (m)” means the distance travelled by light in a vacuum during 1/299 792 458 of a second; “mole (mol)” means the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12; “nautical mile (NM)” means the length equal to 1,852 metres exactly; “newton (N)” means the force which when applied to a body having a mass of 1 kilogram gives it an acceleration of 1 metre per second squared; “Ohm (Ω)” means the electric resistance between two points of a conductor when a constant difference of potential of 1 volt, applied between these two points, produces in this conductor a current of 1 ampere, this conductor not being the source of any electromotive force; “pascal (Pa)” means the pressure or stress of 1 newton per square metre; “radian (rad)” means the plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius; “second (s)” means the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom; “siemens (S)” means the electric conductance of a conductor in which a current of 1 ampere is produced by an electric potential difference of 1 volt; “sievert (Sv)” means the unit of radiation dose equivalent corresponding to 1 joule per kilogram; “steradian (sr)” means the solid angle which having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere; “tesla (T)” means the magnetic flux density given by a magnetic flux of 1 weber per square metre; “tonne (t)” means the mass equal to 1 000 kilograms; “volt (V)” means the unit of electric potential difference and electromotive force which is the difference of electric potential between two points of a conductor carrying a constant current of 1 ampere, when the power dissipated between these points is equal to 1 watt; “watt (W)” means the power which gives rise to the production of energy at the rate of 1 joule per second; “weber (Wb)” means the magnetic flux which, linking a circuit of one turn, produces in it an electromotive force of 1 volt as it is reduced to zero at a uniform rate in 1 second.

Section 3. Application Section These Regulations shall apply to all aspects of civil aviation air and ground operations.

Section 4. SI Units Section 4(1) The International System of Units developed and maintained by the General Conference of Weights and Measures (CGPM) shall, subject to regulations 5 and 6, be used as the standard system of units of measurement for all aspects of civil aviation air and ground operations. Section 4(2) The prefixes and symbols listed in Table 1 of the Schedule shall be used to form names and symbols of the decimal multiples and submultiples of SI units.

Section 5. Non- SI Units alternative units permitted for temporary use with the SI Section The non-SI units listed in Table 3 of the First Schedule shall be permitted for temporary use as alternative units of measurement but only for those specific quantities listed in Table 4.

Section 6. Application of specific units Section 6(1) The application of units of measurement for certain quantities used in civil aviation air and ground operations shall be in accordance with Table 4 of the first schedule of these regulations. Section 6(2) In instances where the mole is used, the elementary entities shall be specified and may be atoms, molecules, ions, electrons, other particles or specified groups of such particles.

Section 7. Design, procedures and training Section The means and provisions for design, procedures and training shall be established for operations in environments involving the use of standard and non-SI alternatives of specific units of measurement, or the transition between environments using different units, with due consideration to human performance.

Section 8. Use of alternative non-SI units Section The use in civil aviation operations of the alternative non SI units (Knot, Nautical Mile and foot) shall be terminated on the dates to be established by International Civil Aviation.

Section 9. Offence Section Any violation to these Regulations shall be subject to the general penalty provisions as provided in section 80 of the Civil Aviation Act.