1page 5 tso c129a note 1 while the numeric display

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TSO-C129a NOTE 1: While the numeric display need not be located with the non-numeric cross-track display (subparagraph 2.2.1.1.2) or in the pilot's primary field of view, flight technical error (FTE) can be reduced when the numeric display is integrated with the non-numeric display or is located within the pilot's primary field of view. Both digital cross track and track angle error have been shown to reduce FTE. This information should be displayed together (either within the CDU or remotely displayed near the non-numeric display) for better tracking performance. NOTE 2: The use of non-numeric cross track data integrated with non-numeric track angle error data into one display may provide the optimum of situation and control information for the best overall tracking performance. (viii) Non-Numeric Display Information . In lieu of paragraph 2.2.1.1.2 of RTCA/DO-208, substitute the following requirements: 1. The equipment shall continuously provide either a display or electrical output with the following requirements: 2. The applicable non-numeric display information shall be automatically presented upon activation of the appropriate operating mode and the conditions outlined in paragraph (a)(3)(xii). 3. A means shall be provided for manual selection of the applicable display sensitivities in paragraph (a)(3)(viii)1. Additionally, the Page 6    (a)(3)(vii)   En route Terminal Non-Precision Approach Full-Scale Deflection (+ nm) 5.0 1.0 0.3 Readability (Display only, nm) £ 1.0 £ 0.1 £ 0.03 Minimum Discernible Movement (Display only, nm) £ 0.1 £ 0.01 £ 0.01 Resolution of Electrical Output Percentage of Full Scale (+ ) 1% 1% 1% Accuracy of Centered Display (+ nm) 0.2 0.1 0.01 Linearity of Display or Electrical Output (+ ) 20% 20% 20%
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TSO-C129a equipment shall display the non-numeric scale sensitivity, or provide an electrical output to display this information on an external display. 4. For Class A1 equipment, manual selection of a different scale sensitivity shall result in deselection of the approach mode. A proper indication must be provided. 5. In lieu of a linear lateral deviation scale for the final approach segment (final approach fix to missed approach point), an angular deviation display that emulates the nominal ILS localizer/MLS azimuth display resolution may be used, beginning with a full scale cross-track deflection of + 0.3 nm at the final approach fix decreasing to + 0.0576 nm (plus or minus 350 feet) at the runway threshold. (ix) Waypoint Entry . In lieu of paragraphs 2.2.1.5 and 2.2.1.9 of RTCA/DO-208, substitute the following requirements: 1. Equipment certified to class A2 shall at least provide the capability to manually enter and display (prior to its utilization in the flight plan) the coordinates of a waypoint in terms of latitude and longitude with a resolution of 0.1 minute or better. If the equipment provides the ability to enter a waypoint as a range and bearing from another waypoint, the waypoint input resolution shall be 0.1 nm and 1 degree or better.
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