The Air Navigation (General) (Amendment) Regulations 1997
These Regulations amend the Air Navigation (General) Regulations 1993. The following changes are made:A height keeping performance capability is prescribed. Aircraft registered in the United Kingdom flying within airspace prescribed for the purposes of minimum navigation performance and notified for the purpose of reduced vertical separation minima must carry equipment which have the prescribed height keeping performance capability (regulation 2(1)).An amendment is made to the airspace prescribed for the purposes of minimum navigation performance (regulation 2(2)).