750 

14 CFR Ch. I (1–1–19 Edition) 

§ 34.20 

Subpart C—Exhaust Emissions 

(New Aircraft Gas Turbine En-
gines) 

§ 34.20

Applicability. 

The provisions of this subpart are ap-

plicable to all aircraft gas turbine en-
gines of the classes specified beginning 
on the dates specified in § 34.21. 

§ 34.21

Standards for exhaust emis-

sions. 

(a) Exhaust emissions of smoke from 

each new aircraft gas turbine engine of 
class T8 manufactured on or after Feb-
ruary 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, manufac-
tured on or after January 1, 1976, shall 
not exceed 

SN = 83.6 (rO)

¥

0.274

(rO is in kN). 

(c) Exhaust emission of smoke from 

each new aircraft gas turbine engine of 
class T3 manufactured on or after Jan-
uary 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 De-
cember 31, 1999 (Tier 2): 

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 De-
cember 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 out-
put 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 out-
put greater than 26.7 kN but not great-
er than 89 kN: 

Oxides of Nitrogen: (37.572 + 1.6(rPR) 

¥ 

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) 

¥ 

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 manufac-

tured 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)

¥

0.274

(rO is in kN) not to 

exceed a maximum of SN = 50. 

VerDate Sep<11>2014 

12:50 Apr 30, 2019

Jkt 247046

PO 00000

Frm 00760

Fmt 8010

Sfmt 8010

Y:\SGML\247046.XXX

247046

spaschal on DSK3GDR082PROD with CFR