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The NOx Global Prototype. Ted Thrasher March 6, 2006. Overview. The Team The Objective The Approach The Result The Context for AEDT. The Team. The NOx Prototype Development Team: FAA Office of Environment and Energy (sponsor) USDOT Volpe Center ATAC Corporation CSSI, Inc.

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the nox global prototype

The NOx Global Prototype

Ted Thrasher

March 6, 2006

  • The Team
  • The Objective
  • The Approach
  • The Result
  • The Context for AEDT
the team
The Team
  • The NOx Prototype Development Team:
    • FAA Office of Environment and Energy (sponsor)
    • USDOT Volpe Center
    • ATAC Corporation
    • CSSI, Inc.
    • Wyle Laboratories
the objective
The Objective
  • Develop a system for assessing aviation noise and emissions interdependencies
  • The 35th Session of the ICAO Assembly (A35) established 6 Strategic Objectives to “achieve its vision of safe, secure and sustainable development of civil aviation through cooperation amongst its member States”
  • Strategic Objective C, Environmental Protection
    • Minimize the adverse effect of global civil aviation on the environment, will be attained, in part, by developing, adopting, and promoting new or amended measures to:
      • limit or reduce the number of people affected by significant aircraft noise
      • limit or reduce the impact of aviation emissions on local air quality; and
      • limit or reduce the impact of aviation greenhouse gas emissions on the global climate
  • Demonstrate the ability to model the effects of imposing an emissions stringency on aircraft
  • Demonstrate progress toward developing a suite of tools to assess noise and emissions interdependencies
the approach
The Approach
  • Derived schedule of operations
    • Baseline and future cases
  • Developed replacements database
  • Compiled an airport database
  • New software to
    • Model delays
    • Model aircraft performance
    • Model aircraft emissions
    • Generate reports
  • Modified existing software to apply the FESG forecast to
    • Actual operations (ETMS) and
    • Scheduled operations (IOAG)
  • Resulted in a schedule of operations
  • For emissions, the exact aircraft/engine combination is necessary
  • Registration data used to determine distribution of airframe/engine combinations based on generic ETMS/IOAG types
    • Example: American Airlines B752 =

11% B757-200 with PW2037 engines

2% B757-200 with PW2040 engines

87% B757-200 with RB211-535E4-B engines

  • Origin and Destination airport information preserved
  • Takeoff weight estimated based on trip length
replacements database
Replacements Database
  • Fleet registration data provided aircraft age
  • Developed a database of aircraft replacements for future scenarios based on available FESG data
airport database
Airport Database
  • Airport database developed with global coverage (32,000+ airports)
    • Key parameters for NOx Prototype
      • Airport elevation
      • Average annual temperature
      • Average annual pressure
      • Average annual humidity
    • Supports aircraft performance calculations
    • Input to Boeing Fuel Flow Method 2 for emissions
  • Multiple identifiers for the same airport
    • IOAG uses IATA (non-unique) identifier + country
    • ETMS uses ICAO, FAA, and IATA
  • Airport database was needed to resolve airport ambiguities
delay modeling
Delay Modeling
  • Where airport capacity data were available, taxi-in/out times were calculated in 1-hour increments, aggregated to annual average values
  • Airborne arrival delays were also computed
aircraft performance
Aircraft Performance


Using SAGE

SAE-AIR-1845 Performance +

BADA Fuel Using EDMS

emissions calculations
Emissions Calculations
  • Emissions were modeled gate-to-gate
  • Boeing Fuel Flow Method 2 was used for computing emissions
generate reports
Generate Reports
  • A reporting module was developed to automate the report generation process
  • Implemented in EDMS
  • Accepts emissions results from SAGE and aggregates with EDMS
  • Output is HTML that can be copied into Excel for plotting results
the result
The Result
  • Comprehensive modeling demonstration
  • Emissions inventory for the global fleet
    • NOx, CO2, H2O
    • 2002, 2006, 2008, 2012, 2016, 2020
    • 5 – 30% NOx stringencies
    • 3,000 feet and below, 10,000 feet and below, total flight
looking beyond the lto
Looking Beyond the LTO
  • Entire flight = 100%
  • LTO only captures 10% of NOx

* Preliminary data. Do not cite or quote.

context for aedt
Context for AEDT
  • NOx Prototype is a huge step toward a noise/emissions tradeoff capability
  • In the past year
    • Harmonized data between EDMS, INM, MAGENTA, SAGE
      • Airports
      • Fleet
    • Harmonized performance calculations
    • Harmonized emissions calculations
context for aedt continued
Context for AEDT (continued)
  • All 4 core modules of AEDT can “talk” at some level

emissions below 3k









emissions above 10k

weights @ 3k







context for aedt concluded
Context for AEDT (concluded)
  • CDA prototype will continue the evolution toward AEDT
  • Distributed modules of AEDT benefit from NOx Prototype
    • EDMS 5.0 beta used as the NOx Prototype (below 10,000 feet) platform
    • INM 7 will include harmonized system tables