scope:

The requirements of the appropriate Defence Standards listed in Chapters 1 and 2 of Defence Standard 00-00 (Part 3) Section 1 shail be met. Where these requirements standardize a given item (e.g., a piece of equipment or a type of fluid or gas), no other item shall be used to perform functions for which this standard item is suitable, unless the use of an alternative item is:

authorised by the Aeroplane Specification,

permitted by the requirements of this publication, or

approved by the appropriate Aeroplane Project Director (see also the introduction to DEF STAN 00-00 (Part 3) Section 1.