Xii approach mode selection and sequencing add the

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(xii) Approach Mode Selection and Sequencing . Add the following requirement to RTCA/DO-208: 1. For accomplishment of non-precision approaches, when an approach is included in the active flight plan, class A1 equipment shall provide the following: a. At a radial distance of 30 nm from the destination airport (not distance along the flight plan route), the equipment shall immediately transition to terminal integrity performance as specified in Table 2-1 of RTCA/DO-208: b. The equipment can enable the approach either manually or automatically. i. If the approach is enabled manually, the equipment shall provide an approach enable alert at a radial distance of 30 nm from the destination airport. After display of this alert, a means shall be provided to enable the approach mode with a single action by the pilot. Concurrent with the approach enable alert, a suitable means to alert the pilot of the need to manually insert the barometric pressure setting shall be provided (unless the automatic altitude input utilizes barometric corrected altitude data). ii. If the approach is enabled automatically, the equipment shall activate the approach mode prior to a distance of 3 nm inbound to the final approach fix. The approach should not be enabled automatically more than 30 nm from the destination airport. An indication that the approach has been enabled shall be provided. Concurrent with this indication, a suitable means to alert the pilot of the need to manually insert the barometric pressure setting shall be provided (unless the automatic altitude input utilizes barometric corrected altitude data). c. When the approach is enabled (either manually or automatically), the equipment shall provide a smooth transition from 5 nm non-numeric display sensitivity to 1 nm sensitivity. No unique indication of the sensitivity change is required. d. At a distance of 3 nm inbound to the final approach fix, the equipment shall provide an annunciation indicating an automatic non-numeric display sensitivity change will occur. If the approach was not previously enabled, the approach enable alert shall be repeated (manual systems only). Page 10    (a)(3)(vii)  
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TSO-C129a e. At a distance of 2 nm inbound to the final approach fix, if the approach has been enabled , the equipment shall automatically verify that satellite vehicle geometry will be suitable during the approach. This must be done using the RAIM prediction function defined in paragraph (a)(3)(xv)4a, including the FAF and the MAP. If the RAIM function is predicted to be available, the equipment shall switch to approach mode and: i. Immediately transition from terminal integrity performance to approach integrity performance as specified in Table 2-1 of RTCA/DO-208. ii. Provide a smooth transition from 1 nm non- numeric display sensitivity to 0.3 nm sensitivity at the final approach fix.
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