2025 Altimetry System Error (ASE) Technical Interchange Event

  • Dates: 9th to 11th September 2025
  • Location: Seattle, WA 98121 USA 

Representatives from the Federal Aviation Administration and EUROCONTROL chaired an Altimetry System Error (ASE) Technical Interchange Event on 9th to 11th September 2025 in Seattle, Washington.

This ASE Technical Interchange Meeting was open to aviation industry and regulatory agency attendees.

Executive Summary (PDF) 

Agenda (PDF)

Day 1

Day 1 Presentations
Presentation Presented by
RVSM in North America (PDF) NAARMO
Large ASE in the United States (PDF) NAARMO

Day 2

Day 2 Presentations
Presentation Presented by
Operational Need for and Benefits Associated with Extension of RVSM above 410 (PDF)

NAV CANADA and NATCMA
Observed Performance Above and Below 410 (PDF) NAARMO
RVSM above FL410 - METEOMATICS' View on What is Possible (PDF) METEOMATICS
Comparison of Sources of MET Data (PDF) NAARMO
Height Differences Between Flight Levels (PDF) NAARMO

Day 3

Day 3 Presentations
Presentation Presented by
Improvements in Monitoring (PDF)  NAARMO
   

 

A graphic depicting a spiral staircase above clouds with aircraft passing behind the staircase with the concept of and arrow rising from the staircase for RVSM flight levels above 41,000 feet
Last updated: Friday, October 24, 2025