Federal Aviation Administration, DOT

Section 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) Section0.274 (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 manufactured on or after January 1, 1984:
SN = 187(rO) Section0.168 (rO is in kW).
(f) The standards set forth in paragraphs (a), (b), (c), (d), and (e) of this
section refer to a composite gaseous
emission sample representing the operation cycles and exhaust smoke emission 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 subpart G.
(g) Where a gaseous emission standard is specified by a formula, 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 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 engine type certificate family-s characteristic level does not exceed the numerical level of that standard, as described in Section 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]

Section 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 formula, 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 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 engine type certificate
family-s characteristic level does not
exceed the numerical level of that
standard, as described in Section 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) manufactured on and after July 18, 2012:
SN = 83.6(rO) Section0.274 or 50.0, whichever is
smaller
(2) Except as provided in SectionSection 34.9(b) and
34.21(c), for Classes TF, T3 and T8 engines manufactured on and after July
18, 2012, and for which the first individual production model was manufactured on or before December 31, 2013
(Tier 6):

TIER 6 OXIDES OF NITROGEN EMISSION STANDARDS FOR SUBSONIC ENGINES
Class

Rated pressure ratio - 
rPR

Rated output rO
(kN)

NOX
(g/kN)

TF, T3, T8 .....................

rPR - 30 .......................

26.7 < rO - 89.0 ...........

38.5486 + 1.6823 (rPR) Section 0.2453 (rO) Section
(0.00308 (rPR) (rO)).

30 < rPR < 82.6 ...........

spaschal on DSK3GDR082PROD with CFR

rPR - 82.6 ....................

rO > 89.0 ......................

16.72 + 1.4080 (rPR).

26.7 < rO - 89.0 ...........

46.1600 + 1.4286 (rPR) Section 0.5303 (rO) +
(0.00642 (rPR) (rO)).

rO > 89.0 ......................

Section1.04 + 2.0 (rPR).

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

751

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