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

CO      Carbon monoxide

EPA      United States Environmental Protection Agency

FAA      Federal Aviation Administration, United States Department of Transportation

HC      Hydrocarbon(s)

HP      Horsepower

hr      Hour(s)

H20      water

kg      Kilogram(s)

kJ      Kilojoule(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

W      Watt(s)

°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]