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New Approach Navigation Option Displays and Procedures Dovetail With Current and Emerging Technologies

Displays and Procedures Are Similar to ILS
The current ILS remains the basic approach capability. To minimize training requirements, new 737-600/-700/-800/-900 approach options use displays and pilot procedures that are similar to those used with the ILS (fig. B). For example, the new options involve the established fly-to convention, where a lateral pointer on the right of the center scale reference indicates a lateral path to the right of the current aircraft position (fig. C).

The 737-600/-700/-800/-900 displays include an explicit annunciation at the top of the attitude indicator that clearly defines the source of the displayed deviation scales and pointers. The approach data block, which includes the selected station and course and distance measuring equipment distance, is retained in the GLS and IAN approaches although modified to support their unique characteristics.

The 737-600/-700/-800/-900 procedures have been human engineered to ensure that, although their appearance and operation are consistent with an ILS, aircrews easily can differentiate among approach types (fig. 4).

Mixed-Mode Approaches
Under certain circumstances, pilots may choose to mix modes (fig. D). For example, figure E shows an Instrument Landing System localizer (ILS LOC) approach with vertical navigation path (VNAV PTH) vertical guidance. The procedures for mixed-mode approaches are straightforward, and the display formats are consistent and easy to interpret.

Constant-Angle Nonprecision Approaches
Many airlines are moving away from the traditional “dive and drive” step-down procedures and are introducing new constant-angle nonprecision approaches (CANPA). In conjunction with the autopilot, lateral navigation, and vertical navigation, CANPAs decrease workload during approach by allowing the flight crew to load most required data before beginning the approach.

The new 737-600/-700/-800/-900 navigation displays allow the flight crew to easily and intuitively evaluate the status of the entire approach against an objective flight technical error scale and pointer. Flight technical error is a measure of the accuracy with which the airplane is being controlled relative to the defined flight path. Deviations can be caused by the autopilot, crew response to the flight directors, or external environmental conditions such as a wind gradient or turbulence.

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