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)

H20   water

kg   Kilogram(s)

kJ   Kilojoule(s)

kN Kilonewton(s)

kW Kilowatt(s)

lb Pound(s)

LTO   Landing and takeoff

min   Minute(s)

NOX   Oxides of nitrogen

Pa   Pascal(s)

rO   Rated output

rPR   Rated pressure ratio

sec   Second(s)

SP   Shaft power

SN   Smoke number

T   Temperature, degrees Kelvin

TIM   Time in mode

°C   Degrees Celsius

%   Percent

[Doc. No. 25613, 55 FR 32861, Aug. 10, 1990, as amended by Amdt. 34-3, 64 FR 5559, Feb. 3, 1999; Amdt. 34-5, 77 FR 76850, Dec. 31, 2012]