14 CFR 34.2: Abbreviations.

The abbreviations used in this part have the following meanings in both upper and lower case:

CO2 Carbon dioxide

CO Carbon monoxide

EPA United States Environmental Protection Agency

FAA Federal Aviation Administration, United States Department of Transportation

g Gram(s)

HC Hydrocarbon(s)

HP Horsepower

hr Hour(s)

H2O Water

kg Kilogram(s)

kJ Kilojoule(s)

kN Kilonewton(s)

kW Kilowatt(s)

lbf Pound force

LTO Landing and takeoff

m Meter(s)

mg Milligram(s)

µg Microgram(s)

min Minute(s)

MJ Megajoule(s)

NOX Oxides of nitrogen

nvPM Non-volatile particulate matter

nvPMmass Non-volatile particulate matter mass

nvPMMC Non-volatile particulate matter mass concentration

nvPMnum Non-volatile particulate matter number

Pa Pascal(s)

rO Rated output

rPR Rated pressure ratio

sec Second(s)

SP Shaft power

SN Smoke number

T Temperature in degrees Kelvin

TIM Time in mode

°C Degrees Celsius

% Percent