751 

Federal Aviation Administration, DOT 

§ 34.23 

(2) For Classes T3, T8, TSS, and TF of 

rated output equal to or greater than 
26.7 kN (6,000 lb) manufactured on or 
after January 1, 1984: 

SN = 83.6(rO)

¥

0.274

(rO is in kN) not to 

exceed a maximum of SN = 50. 

(3) For Class TP of rated output 

equal to or greater than 1,000 kW man-
ufactured on or after January 1, 1984: 

SN = 187(rO)

¥

0.168

(rO is in kW). 

(f) The standards set forth in para-

graphs (a), (b), (c), (d), and (e) of this 
section refer to a composite gaseous 
emission sample representing the oper-
ation cycles and exhaust smoke emis-
sion emitted during operation of the 
engine as specified in the applicable 
sections of subpart G of this part, and 
measured and calculated in accordance 
with the procedures set forth in sub-
part G. 

(g) Where a gaseous emission stand-

ard is specified by a formula, calculate 
and round the standard to three signifi-
cant figures or to the nearest 0.1 g/kN 
(for standards at or above 100 g/kN). 
Where a smoke standard is specified by 
a formula, calculate and round the 
standard to the nearest 0.1 SN. Engines 
comply with an applicable standard if 
the testing results show that the en-
gine type certificate family’s char-
acteristic level does not exceed the nu-
merical level of that standard, as de-
scribed in § 34.60. 

[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; Amdt. 34–4, 74 
FR 19127, Apr. 28, 2009; Amdt. 34–5, 77 FR 
76851, Dec. 31, 2012] 

§ 34.23

Exhaust Emission Standards 

for Engines Manufactured on and 
after July 18, 2012. 

The standards of this section apply 

to aircraft engines manufactured on 
and after July 18, 2012, unless otherwise 
exempted or excepted. Where a gaseous 
emission standard is specified by a for-
mula, calculate and round the standard 
to three significant figures or to the 
nearest 0.1 g/kN (for standards at or 
above 100 g/kN). Where a smoke stand-
ard is specified by a formula, calculate 
and round the standard to the nearest 
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 

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