The applicant must develop appropriate test

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The applicant must develop appropriate test procedures to demonstrate the proposed compensating features provide the required level of navigation accuracy and integrity. (vii) RAIM Implementation . Any algorithm which verifies the integrity of the position output using GPS measurements and barometric aiding is considered a RAIM algorithm An algorithm which uses additional information (e.g., multi-sensor system) to verify the integrity of the position output may be acceptable as a RAIM-equivalent. Note that if RAIM is not incorporated in the GPS sensor, the sensor is only eligible for Class B3, B4, C3, and C4 certification. For sensors that provide RAIM, add the following requirement to paragraph 2.2.1.13.3 of RTCA/DO-208: 1. The requirements of this paragraph do not apply to equipment certified to class B3 and B4. 2. The RAIM function shall provide a worldwide availability of at least 95% given the optimal 21 GPS constellation (evaluated at a maximum resolution of 3 degrees in latitude, 180 nm in longitude, every 5 minutes). Barometric altitude aiding may be necessary to achieve this availability. RAIM-equivalent functions must also demonstrate an availability of at least 95%. If the equipment incorporates altitude aiding, appropriate requirements can be found in paragraph (a)(4)(xi) of this TSO. 3. The integrated navigation system with which the GPS sensor is interfaced must provide the RAIM function with terminal integrity performance as specified in Table 2-1 of RTCA/DO-208 within 30 nm of the departure and destination points. In addition, approach mode (class B1 equipment) integrity performance shall be provided from 2 nm prior to the final approach fix to the missed approach point. En route integrity performance shall be provided during other conditions. 4. The equipment shall automatically select the RAIM integrity performance requirements applicable to the phase of flight. 5. Equipment certified to class B1 shall provide a RAIM prediction function: a. This function must automatically predict the availability of RAIM at the final approach fix and missed approach point of an active approach when 2 nm inbound to the final approach fix. 1Page 31
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TSO-C129a b. This function shall provide the pilot, upon request, a means to determine if RAIM will be available at the planned destination at the estimated time of arrival (ETA) (within at least + 15 minutes computed and displayed in intervals of 5 minutes or less). Once complete almanac data has been received, this capability shall be available at any time after the destination point and estimated time of arrival at that point are established. The availability of corrected barometric altitude (either by automatic or manual altimeter setting input) may be assumed for this purpose. (For the purposes of this calculation, an acceptable value of s baro is 50 meters.) A means to manually identify a satellite that is expected to be unavailable (for scheduled maintenance as identified in an FAA Notice to Airmen) shall be provided. Identification of such a satellite for
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