In this paper, the second of two associated papers on IFR heliports, the requirements outlined in the first paper by Mr. F. W. Free for electronic approach aids are examined in more detail and the current status of technical development reviewed.

If the necessary reliability of service to the heliport is to be maintained under adverse weather conditions, then some form of electronic approach and landing system will be required in order to satisfy the stringent safety requirements set by the CAA and in particular, the obstacle clearance criteria in an urban environment. In addition, the provision of an approach aid may give benefits in noise abatement arising from an accurately controlled flight profile even in adverse weather conditions.