14 CFR 34.2 - Abbreviations.
The abbreviations used in this part have the following meanings in both upper and lower case:
CO2 Carbon dioxide
EPAUnited States Environmental Protection Agency
FAAFederal Aviation Administration, United States Department of Transportation
LTOLanding and takeoff
NOXOxides of nitrogen
rPRRated pressure ratio
TTemperature, degrees Kelvin
TIMTime in mode
Title 14 published on 2014-01-01
no entries appear in the Federal Register after this date.