14 CFR § 34.2 - Abbreviations.

---
identifier: "/us/cfr/t14/s34.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 34.2 - Abbreviations."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "34.2"
section_name: "Abbreviations."
chapter_name: "FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "AIRCRAFT"
part_number: "34"
part_name: "FUEL VENTING AND EXHAUST EMISSION REQUIREMENTS FOR TURBINE ENGINE POWERED AIRPLANES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 4321  7572; 49 U.S.C. 106(g), 40113, 44701-44702, 44704, 44714."
regulatory_source: "Docket No. 25613, 55 FR 32861, Aug. 10, 1990, unless otherwise noted."
cfr_part: "34"
---


# 34.2 Abbreviations.

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

CO<sub>2</sub> 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)

H<sub>2</sub>O 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)

NO<sub>X</sub> Oxides of nitrogen

nvPM Non-volatile particulate matter

nvPM<sub>mass</sub> Non-volatile particulate matter mass

nvPM<sub>MC</sub> Non-volatile particulate matter mass concentration

nvPM<sub>num</sub> 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

[Doc. No. FAA-2023-2434, Amdt. 34-7, 89 FR 31085, Apr. 24, 2024]