BRR Portal - Reforming to Transform

PART 22 - UNITS OF MEASUREMENTS TO BE USED IN AIR AND GROUND OPERATIONS

Title

Introduction

Part 22 is about units of measurement to be used in international civil

aviation. It makes use of the metric system as the primary international

standard.

This part contains table of units based essentially on the metric system,

but it also contains four additional interim tables of units for use by

States unable to use the primary table. The unit of measurement covers

all aspects of air and ground operations and not just air-ground

communications. The Part has the International System of Units, known

as SI from the "SystÃ¨me International UnitÃ©s", as the basic standardized

system to be used in civil aviation.

The SI units recognize a number of non-SI units which may be used

permanently in conjunction with SI units in aviation. These include the

litre, the degree Celsius, the degree for measuring plane angle, etc

There are some non-SI units which have a special place in aviation and

which have been retained, at least temporarily. These are the nautical

mile and the knot, as well as the foot when it is used in the measurement

of altitude, elevation or height only.