Federal Aviation Administration Abbreviations and Acronyms

1. ORD
   Observed Range Deviations
2. ORDA
   Open Radar Data Acquisition
3. ORID
   Operational Requirements Document
4. ORPG
   Open System Radar Generator
5. OS
   Operating System
6. OS
   O&M Simulator
7. OSI
   Open Systems Interconnection
8. OSI/CS
   Open Systems Interconnection
9. OSM
   Oceanic Systems Manager
10. OSP
    Operational System Parameter
11. OSPF
    Open Shortest Path First
12. OSPM
    Operating System
13. OST
    Office of the Secretary of Transportation
14. OT
    Operational Testing
15. OTA
    Other Transition Authority
16. OTE
    Operational Test and Evaluation
17. OTH
    Over The Horizon
18. OTP
    Operational Test Plan
19. OTS
    Out of Service
20. PA
    Precision Approach

Last updated: September 10, 2020 — Total entries: 2,563