THE EFFECTIVENESS OF PILOT WARNING INSTRUMENTS: AN ENGINEERING MODEL BASED UPON FLIGHT TEST DATA

Pilot warning or proximity warning instruments (PWI) have been proposed as a means of assuring separation between aircraft operating under see-and-avoid practices. Recent subject flight tests conducted at the M.I.T. Lincoln Laboratory have provided data involving subject pilots using a PWI display to acquire traffic under actual flight conditions. An engineering model suitable for understanding pilot visual acquisition performance has been developed based upon this data. It is shown that visual acquisition performance may be described in terms of a non-homogeneous Poisson process for which the acquisition rate is proportional to the solid angle subtanded by the target. Values on model parameters appropriate for both alerted and unalerted search are derived from the data by maximum likelihood techniques. The model is utilized to predict visual acquisition effectiveness. Definite limitations in achievable effectiveness are indicated for near head-on geometries in which increased closure rate and decreased apparent area of the threat combine to degrade performance. For encounters between small slower aircraft (e.g., Piper PA-28) and large faster aircraft (e.g., Boeing 727), the probabilities of acquisition for pilots of the two aircraft differ significantly due to the difference in target area.

  • Availability:
  • Corporate Authors:

    SAFE Association

    P.O. Box 631
    Canoga Park, CA  United States  91303
  • Authors:
    • ANDREWS, J W
  • Publication Date: 1978

Media Info

  • Features: Figures; References;
  • Pagination: p. 9-13
  • Serial:
    • SAFE Journal
    • Volume: 8
    • Issue Number: 4
    • Publisher: SAFE Association
    • ISSN: 0191-6319

Subject/Index Terms

Filing Info

  • Accession Number: 00189697
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 25 1979 12:00AM