895 

Federal Aviation Administration, DOT 

§ 34.23 

0.1 SN. Engines comply with an appli-
cable standard if the testing results 
show that the engine type certificate 
family’s characteristic level does not 
exceed the numerical level of that 
standard, as described in § 34.60. 

(a) Gaseous exhaust emissions from 

each new aircraft gas turbine engine 
shall not exceed: 

(1) For Classes TF, T3 and T8 of rated 

output less than 26.7 kN (6,000 lb) man-
ufactured on and after July 18, 2012: 

SN = 83.6(rO)

¥0.274

or 50.0, whichever is 

smaller 

(2) Except as provided in §§ 34.9(b) and 

34.21(c), for Classes TF, T3 and T8 en-
gines manufactured on and after July 
18, 2012, and for which the first indi-
vidual production model was manufac-
tured on or before December 31, 2013 
(Tier 6): 

T

IER

6 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 ...........

38.5486 + 1.6823 (rPR) 

¥ 

0.2453 (rO) 

¥ 

(0.00308 (rPR) (rO)). 

rO > 89.0 ......................

16.72 + 1.4080 (rPR). 

30 < rPR < 82.6 ...........

26.7 < rO 

≤ 

89.0 ...........

46.1600 + 1.4286 (rPR) 

¥ 

0.5303 (rO) + 

(0.00642 (rPR) (rO)). 

rO > 89.0 ......................

¥

1.04 + 2.0 (rPR). 

rPR 

≥ 

82.6 ....................

rO 

≥ 

26.7 ......................

32 + 1.6 (rPR). 

(3) Engines exempted from paragraph 

(a)(2) of this section produced on or be-
fore December 31, 2016 must be labeled 
‘‘EXEMPT NEW’’ in accordance with 
§ 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). 

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