[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR34.21]

[Page 795]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 34--FUEL VENTING AND EXHAUST EMISSION REQUIREMENTS FOR TURBINE ENGINE 
POWERED AIRPLANES--Table of Contents
 
     Subpart C--Exhaust Emissions (New Aircraft Gas Turbine Engines)
 
Sec. 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.
    (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]