753
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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