Subpart C - Units of Measurement

1.101 Purpose

This Subpart details the requirements governing use of units of measurement to be used.

1.103 Units of Measurement

(a) The units of measurement to be used when exercising the privileges of any licence, approval or certificate issued or validated under these Overseas Territories Aviation Requirements or when conducting any operation which is subject to these Overseas Territories Aviation Requirements shall be as specified in Annex 5 to the Chicago Convention except:

(1) where common usage in a particular case makes it impracticable or undesirable to do so; or

(2) where a particular document or a specification uses units of measurement other than those specified in Annex 5 and it is in the interests of safety or interoperability to use those other units; or

(3) where otherwise specified in the particular Part of these Overseas Territories Aviation Requirements.

(b) Whatever units of measurement are used, the person responsible for safe conduct of the flight or operation shall be responsible for ensuring there is no degradation of safety as a result of using those units, taking particular account of human performance considerations. Such mitigating action may include but not necessarily be restricted to ensuring that a straightforward means of conversion between the appropriate units is readily available.

(c) Particular care shall be taken when abbreviations are used or where, especially in spoken communication, the name of the unit is commonly omitted. In any case where there may be doubt, the name of the unit shall be specified in full.


Change Information

  1. First Issue - published for information June 2004
  2. Second Issue - published for information April 2005
  3. Third Issue - released for gazetting July 2005
  4. Fourth Issue June 2006
  5. Fifth Issue August 2006
  6. Sixth Issue January 2008
  7. Seventh Issue November 2009
  8. Eighth Issue July 2010
  9. Ninth Issue January 2011
  10. Tenth Issue January 2012
  11. Eleventh Issue May 2016
  12. Twelfth Issue August 2017

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