COMBINED VISION 2012 Continued from page 27 Table 4: Below is the actual and possible near future credits. Technology combinations CAT I – ILS w/o EFVS CAT I – ILS w EFVS WAAS-LPV w/o EFVS WAAS-LPV w EFVS NPA w EFVS HUD as CAT II/III + AL SVS w HUD EVS + SVS w HDD SVS w HDD Lower landing limits (ft) 200 100 (EU 1/3RVR) 300-200 100 (EU 1/3RVR) 100 (EU 1/3RVR) via SA/OpSpecs 150 (RTCA) RTCA RTCA Lower take-off limits (ft) NA RTCA NA RTCA RTCA via SA/OpSpecs RTCA RTCA RTCA Approach ban clearance NA Yes NA Yes NA via SA/OpSpecs RTCA RTCA RTCA Surface movement ops NA RTCA NA RTCA RTCA RTCA RTCA RTCA RTCA NA – not applicable. RTCA – refers to being “in work” by RTCA SC213 special committee. NPA – non precision approach. SA/OpSpecs – special authorization to specific operators via OpSpecs process. AL – auto land. The tables clearly indicate there are many credits still to be had as manufactures posture and RTCA develop minimum aviation system performance standards, or MASPs, by consensus-based debate. As the technologies evolve and better integrate, they begin to meet the minimum performance standards. So, the case for actual credit will be made more compelling. A combination of different and new sensors may drive bigger benefits, but unlikely in the near future to meet a zero altitude/zero RVR goal, despite converging improvements. With recent industry acronyms representing significant technology and sensor integration milestones, such as Honeywell’s Plane View, Rockwell Collins’ Pro-Line Fusion and Jetcraft’s HUD Vision Access, industry is sure to get there eventually. Table 5: Below are some of the requirements of the two technologies currently in use. Requirement Need GPS Sufficient real-time visibility Database Ground infrastructure EVS No Yes No Yes (airport/approach lights) SVS Yes (for orientation) No Yes No Table 6: Below are some of the “non-credit” benefits of the two technologies currently in use. Benefit Situational awareness Night into day Accurate landing within TDZ* Unusual attitude display Fuel and ops cost saving * Touch-down zone. ** Flight path vector. EVS Yes Yes Yes w HUD FPV** Yes w HUD Yes SVS Yes Yes No No Yes - 28 -