894
14 CFR Ch. I (1–1–14 Edition)
§ 34.23
the date of manufacture of the indi-
vidual engine was after December 31,
1999 (Tier 2):
Oxides of Nitrogen: (32+1.6(rPR)) g/kN
rO.
(v) The emission standards prescribed
in paragraphs (d)(1)(iii) and (iv) of this
section apply as prescribed beginning
July 7, 1997.
(vi) The emission standards of this
paragraph apply as prescribed after De-
cember 18, 2005. For engines of a type
or model of which the first individual
production model was manufactured
after December 31, 2003 (Tier 4):
(A) That have a rated pressure ratio
of 30 or less and a maximum rated out-
put greater than 89 kN:
Oxides of Nitrogen: (19 + 1.6(rPR)) g/kN
rO.
(B) That have a rated pressure ratio
of 30 or less and a maximum rated out-
put greater than 26.7 kN but not great-
er than 89 kN:
Oxides of Nitrogen: (37.572 + 1.6(rPR) ¥
0.2087(rO)) g/kN rO.
(C) That have a rated pressure ratio
greater than 30 but less than 62.5, and
a maximum rated output greater than
89 kN:
Oxides of Nitrogen: (7 + 2(rPR)) g/kN
rO.
(D) That have a rated pressure ratio
greater than 30 but less than 62.5, and
a maximum rated output greater than
26.7 kN but not greater than 89 kN:
Oxides of Nitrogen: (42.71 + 1.4286(rPR)
¥ 0.4013(rO) + 0.00642(rPR
×
rO)) g/
kN rO.
(E) That have a rated pressure ratio
of 62.5 or more:
Oxides of Nitrogen: (32 + 1.6(rPR)) g/kN
rO.
(2) For Class TSS Engines manufac-
tured on or after January 1, 1984:
Hydrocarbons: 140 (0.92)
rPR
g/kN rO.
(e) Smoke exhaust emissions from
each gas turbine engine of the classes
specified below shall not exceed:
(1) For Class TF of rated output less
than 26.7 kN (6,000 lb) manufactured on
or after August 9, 1985:
SN = 83.6(rO)
¥0.274
(rO is in kN) not to
exceed a maximum of SN = 50.
(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
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