896
14 CFR Ch. I (1–1–14 Edition)
§ 34.30
(c) Engines (including engines that
are determined to be derivative engines
for the purposes of emission certifi-
cation) type certificated with char-
acteristic levels at or below the NO
X
standards of § 34.21(d)(1)(vi) of this part
(as applicable based on rated output
and rated pressure ratio) and intro-
duced before July 18, 2012, may be pro-
duced through December 31, 2012, with-
out meeting the NO
X
standard of para-
graph (a)(2) of this section.
[Doc. No. 34–5, 77 FR 76851, Dec. 31, 2012, as
amended by Amdt. 34–5A, 78 FR 63017, Oct. 23,
2013; 78 FR 65554, Nov. 1, 2013]
Subpart D—Exhaust Emissions (In-
use Aircraft Gas Turbine Engines)
§ 34.30
Applicability.
The provisions of this subpart are ap-
plicable to all in-use aircraft gas tur-
bine engines certificated for operation
within the United States of the classes
specified, beginning on the dates speci-
fied in § 34.31.
§ 34.31
Standards for exhaust emis-
sions.
(a) Exhaust emissions of smoke from
each in-use aircraft gas turbine engine
of Class T8, beginning February 1, 1974,
shall not exceed a smoke number (SN)
of 30.
(b) Exhaust emissions of smoke from
each in-use aircraft gas turbine engine
of Class TF and of rated output of 129
kN (29,000 lb) thrust or greater, begin-
ning January l, 1976, shall not exceed
SN=83.6(rO)
¥0.274
(rO is in kN).
(c) The standards set forth in para-
graphs (a) and (b) of this section refer
to exhaust smoke emission emitted
during operation of the engine as speci-
fied in the applicable sections of sub-
part G of this part, and measured and
calculated in accordance with the pro-
cedures set forth in subpart G.
[Doc. No. FAA–2012–1333, 77 FR 76852, Dec. 31,
2012]
Subpart E—Certification Provisions
§ 34.48
Derivative engines for emis-
sions certification purposes.
(a)
General. A derivative engine for
emissions certification purposes is an
engine configuration that is deter-
mined to be similar in design to a pre-
viously certificated (original) engine
for purposes of compliance with ex-
haust emissions standards (gaseous and
smoke). A type certificate holder may
request from the FAA a determination
that an engine configuration is consid-
ered a derivative engine for emissions
certification purposes. To be consid-
ered a derivative engine for emission
purposes under this part, the configu-
ration must have been derived from the
original engine that was certificated to
the requirements of part 33 of this
chapter and one of the following:
(1) The FAA has determined that a
safety issue exists that requires an en-
gine modification.
(2) Emissions from the derivative en-
gines are determined to be similar. In
general, this means the emissions must
meet the criteria specified in para-
graph (b) of this section. The FAA may
amend the criteria of paragraph (b) in
unusual circumstances, for individual
cases, consistent with good engineering
judgment.
(3) All of the regulated emissions
from the derivative engine are lower
than the original engine.
(b)
Emissions similarity. (1) The type
certificate holder must demonstrate
that the proposed derivative engine
model’s emissions meet the applicable
standards and differ from the original
model’s emission rates only within the
following ranges:
(i)
±
3.0 g/kN for NO
X
.
(ii)
±
1.0 g/kN for HC.
(iii)
±
5.0 g/kN for CO.
(iv)
±
2.0 SN for smoke.
(2) If the characteristic level of the
original certificated engine model (or
any other sub-models within the emis-
sion type certificate family tested for
certification) before modification is at
or above 95% of the applicable standard
for any pollutant, an applicant must
measure the proposed derivative engine
model’s emissions for all pollutants to
demonstrate that the derivative en-
gine’s resulting characteristic levels
will not exceed the applicable emission
standards. If the characteristic levels
of the originally certificated engine
model (and all other sub-models within
the emission type certificate family
tested for certification) are below 95%
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