D for equipment certified to class a1 the loss of the

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d. For equipment certified to class A1, the loss of the RAIM detection function in the approach mode at or before the final Page 12    (a)(3)(vii)  
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TSO-C129a approach fix, including the predicted unavailability of RAIM as described in paragraph (a)(3)(xii)1.f. e. For equipment certified to class A1, failure to enable the approach as described in paragraph (a)(3)(xii)1.d. f. For equipment certified to class A1, when operating in the approach mode without RAIM and navigation performance is degraded because HDOP exceeds 4.0. 3. Additional navigation data (such as distance to waypoint, time to waypoint, ground speed, etc.) shall be removed or flagged when the adequacy of navigation information upon which this data is based cannot be assured. NOTE: Presentation of a failure/status annunciation does not require removal of navigation information from the navigation display. Consideration should be given to continued display of navigation information concurrent with the failure/status annunciation when conditions warrant. NOTE: It is impractical for the operator to monitor, unaided, the changing parameters that affect accuracy. Therefore, the equipment should monitor those parameters for degraded performance that may result from propagation, reception, geometry, selective availability (SA) or other effects to the extent possible and be capable of automatic compensation, deselection, or manual deselection following annunciation of degraded performance consistent with paragraph (a)(3)(xiv) of this TSO. 4. Approach mode status/annunciations. Equipment certified to class A1 shall provide: a. An annunciation, suitable indication or message that the approach mode is enabled. b. An annunciation that the system is in the approach mode (RAIM in RNAV (non-precision) approach integrity performance and non-numeric display in approach sensitivity). c. An annunciation of impending automatic non- numeric display sensitivity change to approach sensitivity. d. An annunciation to alert the pilot of the need to manually insert the barometric pressure (unless automatic altitude input utilizing barometric corrected altitude data is available). 1Page 13
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TSO-C129a e. An annunciation to alert the pilot to enable the approach mode. (xiv) Annunciation of Integrity Alarm . 1. Delete the second sentence of the opening paragraph 2.2.1.13.2 of RTCA/DO-208 and replace with: "A separate and distinctive indication shall be raised in each of the following two circumstances." 2. Add the following requirement to paragraph 2.2.1.13.2 of RTCA/DO-208: In order to minimize nuisance integrity alarms when system navigation accuracy is otherwise not in doubt, properly substantiated compensating features (such as clock coasting, inertial data, other sensors etc.) may be incorporated into the system. The alarm under these conditions may be delayed for a period of time consistent with the worst cases of undetected clock drift or other failures that would cause the position error to exceed the accuracy required for that phase of flight. The
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