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Performance Based Navigation (PBN) Performance Based Navigation (PBN) Presented to: ICAO PBN Workshop for Air Traffic Controllers Michael Watkins, Senior Air Traffic Representative – Asia/Pacific 13-15 June 2017, Beijing, China Overview • Next Generation Air Transportation System (NextGen) • Performance Based Navigation (PBN) • Real World Examples • Stakeholders in the PBN Procedure Development Process • Aircraft Equipage • Area Navigation (RNAV) Departures (SID) • Optimized Profile Descents (OPD) • Flight Management Systems (FMS) • PBN/RNAV Reference Materials Next Generation Air Transportation System - NextGen Integrates new and existing technologies, policies and procedures to enhance safety, save fuel, and reduce delays to deliver a more reliable travel experience. SAVES FUEL NextGen Benefits Reduced Environmental Impact NextGen will reduce aviation’s environmental footprint through a combination of enhanced air traffic procedures, and other measures to make continual improvements. The efficiencies that reduce delays also save fuel and reduce emissions. A key component of NextGen is Performance Based Navigation (PBN) Performance Based Navigation (PBN) History of PBN 2003 2004 2006 2009 2012 • Industry requests the establishment of an RNAV/RNP Program at FAA- RTCA Spring Forum 2002 • FAA Administrator issued a policy statement committing FAA to aggressively pursue the implementation of RNAV and RNP in the National Airspace System - July 22, 2002 • Roadmap initiatives incorporated into NextGen Implementation Plan and FAA Enterprise Architecture - 2008/2009 • NextGen Implementation Plan – March 2012 Performance Based Navigation (PBN) • Navigation based on specified system performance requirements for aircraft operating on an air traffic route, instrument approach procedure, or in a designated airspace. • Potential for aircraft to demonstrate requirements compliance through a mix of capabilities, rather than only specific equipment. PBN makes key distinctions between RNAV and RNP RNAV vs RNP RNAV NO ALERT TO PILOT Route Width Route Centerline RNP ALERT TO PILOT Route Width Route Centerline RNAV/RNP Accuracy Values (Not to be confused with separation standards) Oceanic and remote continental airspace is currently served by two navigation applications, RNAV 10 and RNP 4. En-Route airspace in the U.S. is designated RNAV 2 8 NM Route Width/ RNAV 2 Protected Airspace Terminal airspace is designated RNAV 1 4 NM Route Width/ RNAV 1 Protected Airspace RNP Approach specifications require a standard navigation accuracy of RNP 1 in the initial, intermediate and missed segments and RNP 0.3 in the final RF Leg (Curved) segment. Performance Based Navigation: A Key Building Block of NextGen Conventional RNAV RNP Narrower Waypoints protected areas Current Ground- Based Seamless NAVAIDs Vertical Path Curved Paths Limited Design Increased Airspace Optimized Flexibility Efficiency Use of Airspace What Do Waypoints Do? • Waypoints specify a geographic location in terms of latitude and longitude used for route definition, or as a reporting point. • A waypoint may be used to indicate changes in: – Speed – Altitude – Direction Types of Waypoints Distance of Turn Anticipation (DTA) Fly-by Fly-over PBN Implementation RNAV 2 RNAV 1 Q Routes & RNAV 1 RNAV and RNP AR SIDs T Routes STARs (RNP 0.1-0.3) Approaches An integrated procedures concept will provide a framework for integration of PBN initiatives from departure to approach (including en route). Integration of Procedures Applications for De-confliction, Optimization and Benefits Segregate traffic flows Between arrival/departure and transition operations Between primary and satellite airport operations Between city pairs Benefits of PBN RNAV or RNP procedure implementation can provide benefits in one or more of the following areas: Safety Throughput Efficiency Access Environment Benefits of PBN Safety • More accurate and reliable lateral and vertical paths. • Enables reduced obstacle clearance criteria Allows new three-dimensional guided arrival, approach and departure procedures • Enhances consistency of traffic flow. • Reduces the risk of communication errors. Benefits of PBN Throughput • Reduced delays at airports and in crowded airspace through: Procedurally de-conflicted arrival and departure routes Parallel routes Additional ingress/egress points around busy terminal areas Improved flight rerouting capabilities Development of closely spaced procedures for more efficient use of airspace De-conflicting adjacent airport flows Benefits of PBN Efficiency • Enhanced reliability, repeatability, and predictability of operations increases air traffic throughput. More precise arrival, approach, and departure procedures reduce track dispersion and facilitate smoother traffic flows Less restrictive climb and descent gradients with shorter and more predictable ground tracks Benefits of PBN Access • Obstacle clearance and environmental constraints can be better accommodated through the application of optimized flight tracks. • Reduced obstacle clearance criteria and more accurate path keeping can allow improved three- dimensional guided arrival, approach and departure procedures at airports (lower minima). Benefits of PBN Environment • Fuel efficiencies and reduced emissions can be achieved through: Reduced ground delays resulting from the increased efficiency of departure flows Improved flight profiles • Flight tracks can be designed to avoid noise- sensitive areas. Integrated Procedure Development En Route Terminal Integrated STAR and SID procedures More efficient routing Optimal operation of primary and Reduced delays with increased satellite airports without Multiple Q routes for better throughput, predictability and interference utilization of available airspace flexibility of the system More efficient management of Seamless integration of TRACON flows via additional Direct routes between TRACON and En Route ingress/egress waypoints busy city/TRACON pairs domains Reduction in bottlenecks and Fuel efficient delay propagation routing Reduced overall noise and emissions 21 PBN Real World Examples Atlanta (ATL) Departure BEFORE RNAV Procedures Before and After • Approximately 94% of daily departures are RNAV-capable. • More departure lanes and exit points to the en route airspace. Capacity gain of 9-12 departures AFTER RNAV per hour • Repeatable and predictable paths. • Benefits: Increased throughput Reduced departure delays $30M annual benefit Post-RNAV Implementation ATL Communications Reduced up to: • 40% for Departure Controller with RNAV SID • 50% for Approach Controller with RNAV STARs Dallas/Fort Worth Pre Implementation Straight-out International (DFW) Conventional Departure Operations • RNAV enabled diverging Line-up s departures at DFW. queues • Diverging departures allow for the application of same runway Conventional separation standards reducing Departures inter-departure times. Post Diverging Implementation RNAV • Increase in departure capacity. Departure 11 to 20 additional operations per hour Operations 45% reduction in delay during peak Aircraft in s demand #1 position Increased departure capacity results in approximately $8.5M to $12.9M in delay savings per year. RNAV Departures Stakeholders in the PBN Procedure Development Process • PBN Policy and Support Procedure Proponents Group • Aviation System Standards National • Flight Standards Initiatives • Aircraft Certification Lead Operators • Lead Operator • ATC Facilities Airports and/or • Service Center Air Traffic Facilities Ops Support Group Environmental Office Safety Management Office Industry User Groups • Airport Authority Aircraft Equipage B-737 Cockpit MODE CONTROL UNIT (MCU) PRIMARY FLIGHT DISPLAY (PFD) MULTI FUNCTION DISPLAY (MFD) CONTROL DISPLAY UNIT (CDU) Airbus 380 Cockpit Flight Management System (FMS) • All FMS contain a navigation database, the elements from which the flight plan is constructed. These databases are defined via the ARINC 424 standard and are normally updated every 28 days. • FMS capabilities are an integral part of RNAV/RNP procedures. RNP • A defining characteristic of RNP operations is the ability of the aircraft to monitor the navigation performance and inform the crew if the required aircraft performance is not met during an operation. • This on-board monitoring and alerting capability enhances the pilot’s situational awareness and can enable reduced obstacle clearance. RNAV SID RNAV SID Benefits • Shorter and more predictable ground tracks • Reduced frequency congestion • Repeatable flight paths Radar Vector SID SIDs That Use Radar Vectors to Join RNAV Routes • RNAV operations offer significant advantages in establishing routes for departures. • Radar vectoring affords flexibility of routing and allows an aircraft to attain sufficient altitude/distance to achieve a satisfactory navigation solution prior to using RNAV. Air Traffic (AT) may use radar vectors to pre-position departing aircraft prior to authorizing RNAV. Optimized Profile Descent (OPD) RNAV STAR Optimized Profile Descent (OPD) • A descent profile procedure normally associated with a published STAR. – It starts at Top of Descent and, to the extent possible, comprises idle power descents that minimize thrust required to remain on the vertical path. – The termination point may be on an instrument approach procedure to allow for a continuous descent from the STAR to the runway, or at a point in space that allows for radar vectoring. • OPDs are designed to allow use of aircraft automation and piloting techniques to maximize fuel efficiency and minimize environmental impact.
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