Working Group Meeting NASA Langley November 3-4, 2004 Prepared by Kirk Baker, FAA

1. Developing the Certification Requirements for the NexGen Airborne WXR with Enhanced Turbulence Detection Working Group Meeting NASA Langley November 3-4, 2004 Prepared by Kirk Baker, FAA

2. ATDS Working Group • Current WXR Minimum Performance Standard • RTCA DO-173 dated 1980 • Used to obtain TSO Authorization • Beam Characteristics • Tilting • Stabilization • Frequency of scan • Pulse duration • Sensitivity Time Control • Performance Index K factor • Bearing Accuracy • Indicated distance error • Min Detection range • Receiver selectivity • Radio frequency at max emission • DO-160 Environmental • Appendix A Color Characteristics and Measurement Procedures • Appendix B Performance Index Equation Derivation • Are these MPS adequate to address follow on certification of NexGen WRX Turbulence Detection? • Color and Measurement Procedures for Magenta? • New Appendix for Radome Requirements?

3. ATDS Working Group • RTCA DO-220 dated 1993 Forward Looking Capability • SRD 10.2 1996 • What additional requirements do these add to DO-173? • How is Rockwell Collins demonstrating that enhanced magenta modifications are not effecting the performance of weather and windshear detection?

4. ADTS Working Group • Intended Function (IF) • Is the current IF for enhanced magenta supported by current standards well enough to insure? • Standardization • Basic Weather Radar and PWS Safety Objectives are still met • Integration of other weather products (ground based radar)

5. ATDS Working Group • Rockwell Collins design is performing an intended function based on: • NASA Scientific Studies and Support • Collaboration with Delta Airlines for in-service evaluations • Engineering Flight Test

6. ATDS Working Group • THE FAA NEEDS YOUR HELP • We cannot expect every applicant to have the benefit that Collins has had for validating its design through the NASA Turbulence Program and In Service evaluation • We need to use this collaborative effort to establish a baseline for a standard that maintains industries new confidence in Magenta • Maintain Cost Effectives by: • Consistent interpretation of Magenta IF • Consideration of future Turbulence Detection Strategies • Standardize the Certification Requirements

7. ATDS Working Group • Next Step • Rockwell Collins review current radar related standards, DO-173, DO-213, DO-220 and SRD 10.2 and see how they could be used to support validation and verification of enhanced magenta functionality • NASA propose a set of standards that define the turbulence effect on the transport fleet based on g load and propose methods for establishing compliance to those standards through cost effective applications such as laboratory testing • Delta continue to collect data, refine crew procedures and practices and relate in service experience to help establish NexGen turbulence detections IF • Establish a date for our next meeting to review these activities and establish a format and methodology for a product that could be used by the certification authorities by the end of FY-05