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Gray (Gy). The energy imparted by ionizing radiation to a
mass of matter corresponding to 1 joule per kilogram. Nautical mile (NM). The length equal to 1 852 metres exactly.
Henry (H). The inductance of a closed circuit in which an Newton (N). The force which when applied to a body having
electromotive force of 1 volt is produced when the electric a mass of 1 kilogram gives it an acceleration of 1 metre per
current in the circuit varies uniformly at a rate of 1 ampere second squared.
per second.
Ohm (a)T. he electric resistance between two points of a
Hertz (Hz). The frequency of a periodic phenomenon of which conductor when a constant difference of potential of 1 volt,
the period is 1 second. applied between these two points, produces in this
ANNEX 5 2Jl YO0
No. 16
Annex 5 - Units of Measurement to be used in Air and Ground Operations Chapter 1
conductor a current of 1 ampere, this conductor not being
the source of any electromotive force.
Pascal (Pa). The pressure or stress of 1 newton per square
metre.
Radian (rad). 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). 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). 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). The unit of radiation dose equivalent
corresponding to 1 joule per kilogram.
Steradian (sr). 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). The magnetic flux density given by a magnetic flux
of 1 weber per square metre.
Tonne (t). The mass equal to 1 000 kilograms.
VoU (V). 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). The power which gives rise to the production of
energy at the rate of 1 joule per second.
Weber (Wb). 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.
211 1/00
No. 16
CHAPTER 2. APPLICABILITY
Introductory Note.- This Annex contains specifications for the use of a
standardized system of units of measurement in international civil aviation
air and ground operations. This standardized system of units of measurement
is based on the International System of Units (SI) and certain non-SI
units considered necessary to meet the specialized requirements of
international civil aviation. See Attachment A for details concerning the
development of the SI.
2.1 Applicability
The Standards and Recommended Practices contained in this Annex shall
be applicable to all aspects of international civil aviation air and ground
operations.
Ulrn
No. 16
ANNEX 5
CHAPTER 3. STANDARD APPLICATION OF UNITS OF MEASUREMENT
3.1 SI Units
3.1.1 The International System of Units developed and
maintained by the General Conference of Weights and
Measures (CGPM) shall, subject to the provisions of 3.2 and
3.3, be used as the standard system of units of measurement
for all aspects of international civil aviation air and ground
operations.
3.1.2 Prefixes
The prefixes and symbols listed in Table 3-1 shall be used
to form names and symbols of the decimal multiples and
sub-multiples of SI units.
Note 1.- As used herein the term SI unit is meant to
include base units and derived units as well as their multiples
and sub-multiples.
Note 2.- See Attachment B for guidance on the general
application of prefies.
3.2 Non-SI Units
3.2.1 Non-SI units for permanent use with the SI
The non-SI units listed in Table 3-2 shall be used either in
lieu of, or in addition to, SI units as primary units of
measurement but only as specified in Table 3-4.
3.2.2 Non-SI alternative units permitted
for temporary use with the SI
The non-SI units listed in Table 3-3 shall be permitted for
temporary use as alternative units of measurement but only for
those specific quantities listed in Table 3-4.
Note.- It is intended that the use of the non-SI alternative
units listed in Table 3-3 and applied as indicated in Table 3-4
will eventually be discontinued in accordance with individual
　
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