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CFR › Title 14 › Chapter I › Subchapter C › Part 34 › Subpart C › Section 34.21

14 CFR 34.21 - Standards for exhaust emissions.

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§ 34.21
Standards for exhaust emissions.
(a) Exhaust emissions of smoke from each new aircraft gas turbine engine of class T8 manufactured on or after February 1, 1974, shall not exceed a smoke number (SN) of 30.
(b) Exhaust emissions of smoke from each new aircraft gas turbine engine of class TF and of rated output of 129 kilonewtons (29,000 pounds) thrust or greater, manufactured on or after January 1, 1976, shall not exceed
SN=83.6 (rO)−0.274 (rO is in kilonewtons).
(c) Exhaust emission of smoke from each new aircraft gas turbine engine of class T3 manufactured on or after January 1, 1978, shall not exceed a smoke number (SN) of 25.
(d) Gaseous exhaust emissions from each new aircraft gas turbine engine shall not exceed:
(1) For Classes TF, T3, T8 engines greater than 26.7 kilonewtons (6000 pounds) rated output:
(i) Engines manufactured on or after January 1, 1984:
Hydrocarbons: 19.6 grams/kilonewton r0.
(ii) Engines manufactured on or after July 7, 1997.
Carbon Monoxide: 118 grams/kilonewton r0.
(iii) Engines of a type or model of which the date of manufacture of the first individual production model was on or before December 31, 1995, and for which the date of manufacture of the individual engine was on or before December 31, 1999:
Oxides of Nitrogen: (40 2(rPR)) grams/kilonewtons r0.
(iv) Engines of a type or model of which the date of manufacture of the first individual production model was after December 31, 1995, or for which the date of manufacture of the individual engine was after December 31, 1999:
Oxides of Nitrogen: (32 1.6 (rPR)) grams/kilonewtons r0.
(v) The emission standards prescribed in paragraphs (d)(1)(iii) and (iv) of this section apply as prescribed beginning July 7, 1997.
(vi) The emission standards of this paragraph apply as prescribed after December 18, 2005. For engines of a type or model of which the first individual production model was manufactured after December 31, 2003:
(A) That have a rated pressure ratio of 30 or less and a maximum rated output greater than 89 kilonewtons: Oxides of Nitrogen: (19 1.6 (rPR)) grams/kilonewtons rO.
(B) That have a rated pressure ratio of 30 or less and a maximum rated output greater than 26.7 kilonewtons but not greater than 89 kilonewtons: Oxides of Nitrogen: (37.572 1.6(rPR) −0.2087(rO)) grams/kilonewtons rO.
(C) That have a rated pressure ratio greater than 30 but less than 62.5, and a maximum rated output greater than 89 kilonewtons: Oxides of Nitrogen (7 2(rPR)) grams/kilonewtons rO.
(D) That have a rated pressure ratio greater than 30 but less than 62.5, and a maximum rated output greater than 26.7 kilonewtons but not greater than 89 kilonewtons: Oxides of Nitrogen: (42.71 1.4286(rPR) − 0.4013(rO) 0.00642(rPR x rO)) grams/kilonewtons rO.
(E) That have a rated pressure ratio of 62.5 or more: Oxides of Nitrogen: (32 1.6 (rPR)) grams/kilonewtons rO.
(2) For Class TSS Engines manufactured on or after January 1, 1984:
Hydrocarbons=140 (0.92) rPR grams/kilonewtons r0.
(e) Smoke exhaust emissions from each gas turbine engine of the classes specified below shall not exceed:
(1) Class TF of rated output less than 26.7 kilonewtons (6000 pounds) manufactured on or after August 9, 1985
SN=83.6(rO)−0.274 (rO is in kilonewtons) not to exceed a maximum of SN=50.
(2) Classes T3, T8, TSS, and TF of rated output equal to or greater than 26.7 kilonewtons (6000 pounds) manufactured on or after January 1, 1984
SN=83.6(rO)−0.274 (rO is in kilonewtons) not to exceed a maximum of SN=50.
(3) For Class TP of rated output equal to or greater than 1,000 kilowatts manufactured on or after January 1, 1984:
SN=187(ro)−0.168 (ro is in kilowatts)
(f) The standards set forth in paragraphs (a), (b), (c), (d), and (e) of this section refer to a composite gaseous emission sample representing the operating cycles set forth in the applicable sections of subpart G of this part, and exhaust smoke emissions emitted during operations of the engine as specified in the applicable sections of subpart H of this part, measured and calculated in accordance with the procedures set forth in those subparts.
[Doc. No. 25613, 55 FR 32861, Aug. 10, 1990; 55 FR 37287, Sept. 10, 1990, as amended by Amdt. 34-3, 64 FR 5559, Feb. 3, 1999; Amdt. 34-4, 74 FR 19127, Apr. 28, 2009]

Title 14 published on 2012-01-01

The following are only the Rules published in the Federal Register after the published date of Title 14.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2012-12-31; vol. 77 # 250 - Monday, December 31, 2012
    1. 77 FR 76842 - Exhaust Emissions Standards for New Aircraft Gas Turbine Engines and Identification Plate for Aircraft Engines
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final rule; request for comments.
      Effective December 31, 2012. Affected parties, however, are not required to comply with the information collection requirement in § 45.11 until the Office of Management and Budget (OMB) approves the collection and assigns a control number under the Paperwork Reduction Act of 1995. The FAA will publish in the Federal Register a notice of the control number assigned by the Office of Management and Budget (OMB) for this information collection requirement. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register as of December 31, 2012. Submit comments on or before March 1, 2013.
      14 CFR Parts 34 and 45

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United States Code
U.S.C. : Title 42 - THE PUBLIC HEALTH AND WELFARE

§ 4321 - Congressional declaration of purpose

§ 7572 - Enforcement of standards

USC : Title 49 - TRANSPORTATION

§ 44701 - General requirements

§ 44702 - Issuance of certificates

§ 44704 - Type certificates, production certificates, airworthiness certificates, and design organization certificates

§ 44714 - Aviation fuel standards

Title 14 published on 2012-01-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 14 CFR 34 after this date.

  • 2012-12-31; vol. 77 # 250 - Monday, December 31, 2012
    1. 77 FR 76842 - Exhaust Emissions Standards for New Aircraft Gas Turbine Engines and Identification Plate for Aircraft Engines
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final rule; request for comments.
      Effective December 31, 2012. Affected parties, however, are not required to comply with the information collection requirement in § 45.11 until the Office of Management and Budget (OMB) approves the collection and assigns a control number under the Paperwork Reduction Act of 1995. The FAA will publish in the Federal Register a notice of the control number assigned by the Office of Management and Budget (OMB) for this information collection requirement. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register as of December 31, 2012. Submit comments on or before March 1, 2013.
      14 CFR Parts 34 and 45