A publication of the National Air Traffic Controllers Association
Issue link: http://natca.uberflip.com/i/793416
fixes as the construction is very sensitive to aircraft and wind speed, however the options are being captured within the options tree and the tradeoff matrix. Fur ther details of the discussions are captured in the tradeoff matrix, which will be revised and re - issued for review prior to the next (March 1) teleconference. Some members have a follow - on action to edit the information in the matrix to make it more read able, and will also update the options tree with one more branch. This will be completed prior to the team tel con on March 1 for discussion during the virtual meeting. Review of Planned Implementation for Historical Winds FAA has asked MITRE to implement the PARC recommendation regarding use of local historical winds as a plug - in to TARGETS. The criteria in 8260.58A does not specifically state whether or not components of winds outside of the turn area that are larger than those contained along the boundar y of the area should be considered. The MITRE implementation considers those components and AFS 420 requested the implementation be brought back to the Nav WG for review. A figure was presented to illustrate the method and explain the components, and after discussion the WG agreed that the method was good and should be used. It was further noted that MITRE was also trying to simplify the data storage (there are very large amounts of data associated with the recommendation) to help AJV and other users of TAR GETS when they want to apply local winds to a specific design. RNP to GLS/LPV Recommendation It was reported that the RNP to ILS criteria with temperature compensating shallow segment has been reviewed and tested substituting both a GLS and LPV final segm ent by all manufacturers. Review and testing of the current ILS criteria applied to LPV and GLS has been supported by Boeing, Honeywell, Rockwell Collins, CMC, and Universal. A draft recommendation to extend the 8260.58A Appendix for ILS to the GLS and LPV final segment will be written and c irculated prior to the next tel con for possible approval and forwarding to the SG. Discussion of High Priority Issues for 2017 There are four issues from the 2017 list that remained "high" priority after SG review in Ja nuary. They are RNP to ILS extension to GLS/LPV, m inimum straight segments around DA for AR procedures, PFAF rounding to nearest 100 feet, and RNP Ops approval streamlining/ simplification. Since the extension to GLS/LPV has now been drafted, and the minimu m (50 second) straight segment issue is being worked in background by Airbus , the team decided to work the PFAF rounding first and later in the year tackle the RNP Ops Approval process after completing the RF/TF Concurrent Ops action team report on the tra de space. It might be possible to complete this work in time for the updated AC90 - 101A. Vertical angle on the FAF During RNP to ILS testing of the shallow segment designs it was found that the data suppliers were by default coding the final segment angle on the FAF, negating the shallow segment (which is around two degrees). Review of ARINC 424 standards and the processes with the suppliers revealed that the blanket extension of the final segment angle into the intermediate segment, while necessary in the rare instances where there was a step - down in the intermediate, was being applied to all precision approaches. The standard allows no angle on the FAF as an option, which should really be applied in