摘要: The aviation industry is employing a building block approach with respect to aircraft avionics in general and automatic flight control systems in particular, to move systematically from Category 1 through Category 2 to Category 3 ... 展开 The aviation industry is employing a building block approach with respect to aircraft avionics in general and automatic flight control systems in particular, to move systematically from Category 1 through Category 2 to Category 3 operations. The building block approach has been quite effective in structuring what must be done in terms of equipments for delivering the aircraft reliably to the Category 1, 2 and 3 equipment minima. From an operational viewpoint, however, the recovery of the aircraft still remains a see-to-land operation for these categories. The purpose of this paper is to address the issue of how far the see-to-land concept can be extended considering the pilot factors constraints in the environment in which the problem exists. The basic question is can the pilot effectively use the equipments in what remains a see-to-land operation. The low visibility landing experiences of the USAF Flight Dynamics Laboratory and the USAF Instrument Flight Center are heavily drawn upon in the preparation of this report. The results of their flying a Head-Up Display in visibilities down to 400 feet Runway Visual Range (RVR) in a T-39 Sabreliner are reviewed and reported. In addition, a number of other relevant papers and reports are used in helping to describe the nature of the low visibility landing. An assessment is made of some solutions that are being proposed for dealing with the see-to-land problem while considering the pilot factors constraints. 收起