A publication of the National Air Traffic Controllers Association
Issue link: http://natca.uberflip.com/i/961329
validate any flight trajectory, crew workload, or risk as sumptions is both necessary and warranted. Recommendations 1. The technical work relative to RNP to ILS remains valid and should be retained as a basis for further design and implementation considerations. 2. A more robust and streamlined process should be est ablished to obtain relevant aircraft performance data to validate aircraft performance from resources such as MITRE and ASIAS. This information would serve to clear up issues that continually arise regarding aircraft 'real world' performance as well as hel p substantiate ongoing and future operational implementations. 3. A concept of use for the RNP to xLS designs should be developed by the Nav WG combined with further work on specific design methods for TF overlays where needed. PARC NAV WG RNP AR 50 second R ule Action Review Mike Cramer (MITRE) reviewed the status of this action after the January virtual meeting, noting that there was concern about allowing reduction of the 50 seconds to zero as part of standard criteria and the concern as if the 500' above Landing Threshold Point (LTP) minimum Final Rollout Point (FROP) still is needed. There was extensive discussion about both topics, with a briefing from AFS sh owing comparison between the 15 - second prior to Decision Altitude (DA) and the 500' above LTP req uirements. Basically, the 500' will come into play in low elevation airports and when the Height Above Touchdown (HAT) approaches 250', so it was decided to leave that requirement as is. Further discussion of possibly allowing times shorter than 15 secon ds as standard was decided against primarily because in the limited times that might be advantageous the 15 seconds could be waived by AFS after review. In addition, Barry Miller (FAA AIR) pointed out that ICAO was moving toward the 15 second standard, and Jeff Kerr (FAA AFS) pointed out that in the draft Advisory Circular (AC) they had adopted the 15 in anticipation of the Nav WG recommendation. The final version of the recommendation was agreed upon, recommending simply that a standard minimum of 15 seco nds prior to DA for the FROP be applied, and the 50 ‐ second time removed from criteria NP AR Departures . As a follow ‐ on to the previous briefing, Barry Miller briefed the group on the work being done on RNP departures at ICAO. His briefing is posted to the Nav WG PARC site in the meeting folder. FAA Briefing on AC90 ‐ 101A Update Progress ‐ Jeff Kerr (AFS - - ‐ 470) had previously asked for a time on the agenda to brief the group on what changes are upcoming in AC90 - - ‐ 101A. Greg Sp ann gave the briefing which will be included on the website as part of the meeting records. The general reaction was positive from the group. They also shared a draft RNP AR compliance guide which will be being replaced by online guidance soon (this wil l also be available on the PARC website for the Nav WG). Jeff asked for volunteers to join in a working review of the AC to help FAA refine the document and better coordinate it with industry prior to the public comment period. The group of