Analysis of VFR Cloud Clearance and Visibility Standards
ROWLAND AND CO HADDONFIELD NJ
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A three-dimensional vector analysis of a two-aircraft near-miss geometry was developed and used to generate a numerical safety rating scheme for quantifying the degree of hazard associated with aircraft-to-cloud separation minimums and with speed-visibility restrictions. Hazard functions were generated for low, medium, and high-speed aircraft. Based upon the resulting data, proposed new Visual Flight Rules were created. The rationale behind the new rules is discussed. Possible effects of the rules are noted. Numerous inadequacies of the data which was inserted in the limited mathematical model are indicated. Additional research needs are sketched. Concern over the broad impact of the proposed new VFR rules, coupled with reservations about the limited scope of the study and the paucity of hard data to incorporate into and actually test out the validity of the model, cause the authors to suggest the firm necessity of substantial additional technical investigation and broad discussion prior to adoption of the new rules.
- Commercial and General Aviation