NextGen dependence on GPS!

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• NextGen dependence on GPS!

Captain Joe Burns Managing Director Flight
Standards, Technology, Flight Test United Airlines
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NextGen dependence on GPS

• RTCA NextGen Mid-Term Implementation Task Force
  Among additional considerations..concern with
  continued reliability and performance of the GPS
  constellation. The report highlights this
  risk,...undermines the achievement of desired
  benefits... page IX

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Optimal NextGen Components

• No-Delay taxi to the runway
• Unimpeded climb-out on departure
• User Preferred Route for the oceanic phase of
  flight
• Reduced Vertical Separation Minima (RVSM)
• Cruise Climb
• Variable optimized speed
• RNP-4 oceanic separation minima (30/30)
• Frequent Dynamic Airborne Reroutes (DARP)
• Tailored Arrival to the approach
• No-Delay taxi to the gate

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NextGen is GPS!

• RNAV/RNP
• VNAV
• EFB
• FANS/Data Communications
• GBAS/LAAS
• WAAS
• ADS-B
• CDTI
• Curved Path - Approaches
• Surface Traffic Applications
• ASDE-X, RAAS, TIS

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NextGen GPS dependency

• RNAV/RNP - GPS
• VNAV - GPS
• EFB GPS
• FANS/Data Communications GPS/Satcom
• GBAS/LAAS GPS
• WAAS GPS
• ADS-B - GPS
• CDTI - GPS
• Curved Path Approaches - GPS
• Surface Traffic Applications - GPS
• ASDE-X, RAAS, TIS

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Navigation Airspace Data Growth why we need
bigger boxes
1962
1977
2003
42,00 lat/long waypoints in US!
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Tailored Arrivals UAL HNL-SFO True 4-D
procedure tailored for flight using continuous
descent
Fuel Saved 1600 lbs!
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3DPath Arrival Management Route Possibilities

• Optimal descents using time-of-arrival
• Assign new Mach/IAS and/or
• Use path stretch

TMA Freeze Horizon
Path Stretch turn out waypoint
Path Stretch return waypoint
2. EDA selects cruise and descent speeds to
minimize path distance
1. EDA selects initial path maneuver. Controller
can override EDA selection by specifying turn
out angle (15, 30, 45, 60) and direction of
turn (left or right)
TOD
3. EDA calculates turn back location (specified
as a PBD from the return waypoint)
Horizontal view
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Same SFO overlay using GPS-based RNP
RNP Allows Better Use of Parallel Runways
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GPS derived information
MDCRS Real-time tracker
http//acweb.fsl.noaa.gov/demo_java/
GTG Turbulence output
http//aviationweather.gov/exp/gtg/mdtter.php
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Tracking turbulence/weather with GPS position
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Surface Moving Map video - FLL
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RAAS in action (UAL B777 _at_ DEN)

• Intersection Departure Insufficient Runway
• Aircraft must enter into runway
• Aircraft heading /- 20 deg of runway heading
• Distance for takeoff less than nominal (user
  selected)
• On runway 34 Left, one thousand two hundred
  remaining

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How does GPS benefit US Aviation?

• Precision Navigation MORE CAPACITY, MORE ALL
  WEATHER OPS
• Precision Timing BETTER FLOW MANAGEMENT
• Position awareness SAFETY
• Reduced fuel burn
• Reduced block times
• Greener more efficient ops!

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Thank you!