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754 

14 CFR Ch. I (1–1–24 Edition) 

§ 34.30 

§ 45.13 of this chapter. No exemptions to 
the requirements of paragraph (a)(2) of 
this section will be granted after De-
cember 31, 2016. 

(4) For Class TSS Engines manufac-

tured on and after July 18, 2012: 

G

ASEOUS

E

MISSION

S

TANDARDS FOR

S

UPERSONIC

E

NGINES

 

Class 

Rated output 

rO

1

(kN) 

NO

X

 

(g/kN) 

CO 

(g/kN) 

TSS ..........................................

All ............................................

36 + 2.42 (rPR) .....................

4,550 (rPR)

¥

1.03

 

1

rO is the rated output with afterburning applied. 

(b) Gaseous exhaust emissions from 

each new aircraft gas turbine engine 
shall not exceed: 

(1) For Classes TF, T3 and T8 engines 

of a type or model of which the first in-

dividual production model was manu-
factured after December 31, 2013 (Tier 
8): 

T

IER

8 O

XIDES OF

N

ITROGEN

E

MISSION

S

TANDARDS FOR

S

UBSONIC

E

NGINES

 

Class 

Rated pressure ratio— 

rPR 

Rated output rO 

(kN) 

NO

X

 

(g/kN) 

TF, T3, T8 .....................

rPR 

≤ 

30 .......................

26.7 < rO 

≤ 

89.0 ...........

40.052 + 1.5681 (rPR) 

¥ 

0.3615 (rO) 

¥ 

(0.0018 (rPR) (rO)). 

rO > 89.0 ......................

7.88 + 1.4080 (rPR). 

30 < rPR < 104.7 .........

26.7 < rO 

≤ 

89.0 ...........

41.9435 + 1.505 (rPR) 

¥ 

0.5823 (rO) + 

(0.005562 (rPR) (rO)). 

rO > 89.0 ......................

¥

9.88 + 2.0 (rPR). 

rPR 

≥ 

104.7 ..................

rO 

≥ 

26.7 ......................

32 + 1.6 (rPR). 

(c) Engines (including engines that 

are determined to be derivative engines 
for the purposes of emission certifi-
cation) type certificated with char-
acteristic levels at or below the NO

X

 

standards of § 34.21(d)(1)(vi) of this part 
(as applicable based on rated output 
and rated pressure ratio) and intro-
duced before July 18, 2012, may be pro-
duced through December 31, 2012, with-
out meeting the NO

X

standard of para-

graph (a)(2) of this section. 

[Doc. No. 34–5, 77 FR 76851, Dec. 31, 2012, as 
amended by Amdt. 34–5A, 78 FR 63017, Oct. 23, 
2013; 78 FR 65554, Nov. 1, 2013] 

Subpart D—Exhaust Emissions (In- 

use Aircraft Gas Turbine Engines) 

§ 34.30

Applicability. 

The provisions of this subpart are ap-

plicable to all in-use aircraft gas tur-
bine engines certificated for operation 
within the United States of the classes 
specified, beginning on the dates speci-
fied in § 34.31. 

§ 34.31

Standards for exhaust emis-

sions. 

(a) Exhaust emissions of smoke from 

each in-use aircraft gas turbine engine 
of Class T8, beginning February 1, 1974, 
shall not exceed a smoke number (SN) 
of 30. 

(b) Exhaust emissions of smoke from 

each in-use aircraft gas turbine engine 
of Class TF and of rated output of 129 
kN (29,000 lb) thrust or greater, begin-
ning January l, 1976, shall not exceed 

SN = 83.6(rO)

¥

0.274

(rO is in kN). 

(c) The standards set forth in para-

graphs (a) and (b) of this section refer 
to exhaust smoke emission emitted 
during operation of the engine as speci-
fied in the applicable sections of sub-
part G of this part, and measured and 
calculated in accordance with the pro-
cedures set forth in subpart G. 

[Doc. No. FAA–2012–1333, 77 FR 76852, Dec. 31, 
2012] 

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