ICAO 9953 PDF

Introduction

In support of the work of the International Civil Aviation Organization (lCAO) , Committee on Aviation Environmental Protection (CAEP) , Long Term Technology Task Group (LTTG) of Working Group 3 (WG3), the first LTTG oxides of nitrogen (NO_x) Technology Review was held in London in March 2006. For this Review a group of Independent Experts (IEs) was tasked with leading the review of technologies for the control of NO_x culminating in the IEs recommendations for medium term [MT] (10 year) and long term [LT] (20 year) goals for NO_x control. The IEs recommended (and CAEP 7 subsequently accepted) MT (2016) and LT (2026) Technology goals. The IEs used the Landing-and-Takeoff (LTO) NO_x certification metric to define the goals. The 2006 IE Report is available on the FAA website: http://www.faa.gov/aboutJoffice_org/headquarters _ offices/aep/research/science _integrated _ modeling/media\Independent%20Experts%20Report. pdf.

In the 2006 Review the IEs positioned the MT technology goal at CAEP/6 minus 45% ± 2.50/0 at a reference Operating Pressure Ratio (OPR) of 30. The bandwidth is relatively small indicating a reasonable degree of confidence in the ability to achieve the Goal. The IEs positioned the LT technology goal at CAEP/6 minus 600/0 ± 5% at the same reference OPR of 30. The greater bandwidth as compared with the MT technology goal reflected the greater degree of uncertainty of meeting the Goal. The criterion adopted by the IEs was that a goal would be considered met when - one or more manufacturers achieve a performance at or below the upper line of the goal band judged against achieving a Technology Readiness Level (TRL) 82 (Appendix A). The 2006 Review report stressed the difference between CAEP standards which follow technology capability and the NO_x Goals which attempt to predict where the leading edge capability may lie at ten and twenty years in to the future.

This Report of the second NO_x Review was commissioned by CAEP7 for reporting to CAEP8. Key participants and organizations within the LTTG process have been given the opportunity to comment on draft versions of this Report. A mature draft version was presented to the September 2009 meeting of WG3 and this final version is for presentation to the CAEP/8 meeting scheduled for February 20,10 in Montreal, Canada.

² TRL 8 designates actual system completed and "flight qualified" through test and demonstration