Section 34.20

14 CFR Ch. I (1-1-19 Edition)

Subpart
C - Exhaust
Emissions
(New Aircraft Gas Turbine Engines)
Section 34.20

Applicability.

The provisions of this subpart are applicable to all aircraft gas turbine engines of the classes specified beginning
on the dates specified in Section 34.21.
Section 34.21 Standards
sions.

for

exhaust

emis-

(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 kN
(29,000 lb) thrust or greater, manufactured on or after January 1, 1976, shall
not exceed
SN = 83.6 (rO) Section0.274 (rO is in kN).
(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 kN (6,000 lb) rated
output:
(i) Engines manufactured on or after
January 1, 1984:
Hydrocarbons: 19.6 g/kN rO.
(ii) Engines manufactured on or after
July 7, 1997:
Carbon Monoxide: 118 g/kN rO.
(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 (Tier 2):

spaschal on DSK3GDR082PROD with CFR

Oxides of Nitrogen: (40 + 2(rPR)) g/kN
rO.
(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 indi-

vidual engine was after December 31,
1999 (Tier 2):
Oxides of Nitrogen: (32 + 1.6(rPR)) g/kN
rO.
(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 (Tier 4):
(A) That have a rated pressure ratio
of 30 or less and a maximum rated output greater than 89 kN:
Oxides of Nitrogen: (19 + 1.6(rPR)) g/kN
rO.
(B) That have a rated pressure ratio
of 30 or less and a maximum rated output greater than 26.7 kN but not greater than 89 kN:
Oxides of Nitrogen: (37.572 + 1.6(rPR) Section
0.2087(rO)) g/kN rO.
(C) That have a rated pressure ratio
greater than 30 but less than 62.5, and
a maximum rated output greater than
89 kN:
Oxides of Nitrogen: (7 + 2(rPR)) g/kN
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 kN but not greater than 89 kN:
Oxides of Nitrogen: (42.71 + 1.4286(rPR)
Section 0.4013(rO) + 0.00642(rPR  rO)) g/
kN rO.
(E) That have a rated pressure ratio
of 62.5 or more:
Oxides of Nitrogen: (32 + 1.6(rPR)) g/kN
rO.
(2) For Class TSS Engines manufactured on or after January 1, 1984:
Hydrocarbons: 140 (0.92)rPR g/kN rO.
(e) Smoke exhaust emissions from
each gas turbine engine of the classes
specified below shall not exceed:
(1) For Class TF of rated output less
than 26.7 kN (6,000 lb) manufactured on
or after August 9, 1985:
SN = 83.6(rO) Section0.274 (rO is in kN) not to
exceed a maximum of SN = 50.

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