C this function shall display upon request raim

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c. This function shall display, upon request, RAIM availability at the ETA and over an interval of at least + 15 minutes computed in intervals of 5 minutes or less about the ETA. 5. The GPS equipment shall detect a pseudorange step error greater than 1000 meters, including steps which cause loss of lock for less than 10 seconds. A pseudorange step is defined to be a sudden change in the measured distance to a satellite. If a pseudorange step is detected for a satellite, that satellite shall be excluded from use in the navigation algorithm until its integrity can be verified through fault detection (RAIM). The manufacturer is free to choose any method to calculate the predicted pseudorange or to detect a step. However, any method used should properly take into account satellite movement and aircraft dynamics up to a groundspeed of 750 knots and accelerations up to 14.7 meters/second/second. (xvi) 2D Accuracy Requirements (95 percent probability) . In lieu of paragraph 2.2.2 of RTCA/DO-208, substitute the following requirement: The total of error contributions of the airborne equipment shall not exceed either error value listed in this paragraph. The reference spheroid shall use 1Page 15
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TSO-C129a latitude/longitude values corresponding to the WGS-84 ellipsoid (see Appendix B of RTCA/DO-208). Since FTE factors are beyond the control of the equipment manufacturer or installer, these error sources are not included in this paragraph. The FAA has determined that equipment meeting the display characteristics requirements contained in this TSO provide for acceptable values of FTE when properly installed in an aircraft. GPS RNAV 2D Accuracy Requirements (95% Confidence) * Equipment error assumes an average HDOP of 1.5, GPS equipment waypoint input and output resolution of 0.01 minute for approach/0.1 minute otherwise. Position fixing errors are static values ** The maximum difference between the displayed cross-track deviation and the computed cross-track deviation. (xvii) Sensitivity and Dynamic Range . Add the following requirements to paragraph 2.2.3.1 of RTCA/DO-208: Antenna elevation mask angles below 7.5 degrees may be utilized provided the applicant develops acceptable test conditions and supporting analysis to substantiate use of the desired mask angle. (xviii) Dynamic Tracking . Add the following requirement to paragraph 2.2.3.4 of RTCA/DO-208: The equipment shall meet the applicable GPS position integrity performance requirements of Table 2-1 within the specified times stated in paragraphs a. and b. (xix) (VNAV) Functional and Accuracy Requirements-Standard Conditions. Add the following requirement to paragraph 2.3 of RTCA/DO- 208: If the vertical navigation (VNAV) option is provided by the equipment, the equipment must meet the requirements of paragraphs 2.3 and 2.5.3 of RTCA/DO-208.
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