Federal Aviation Administration Abbreviations and Acronyms

1. CY
   Calendar Year
2. CYR
   Calendar Year
3. DA
   Decision Altitude
4. DA/H
   Decision Altitude (Height)
5. DAA
   Designated Approving Authority
6. DAL
   Development Assurance Level
7. DAS
   Data Approval Sheet
8. DATA MANAGE
   Data Management
9. DAU
   Determine Alarm or Update
10. DB
    Development Baseline
11. DB
    Decibels
12. DB/K
    Decibels per degree Kelvin
13. DBHZ
    Decibel Hertz
14. DBI
    Decibel relative to isotropically radiated power
15. DBIC
    Decibels above Isotropic
16. DBIL
    (Decibels – Isotropic Linear)
17. DBL
    Development Baseline
18. DBM
    Decibels
19. DBW
    Decibel relative to 1 Watt
20. DC
    Department of Commerce

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