Source: https://www.law.cornell.edu/cfr/text/40/87.23
Timestamp: 2016-09-30 22:15:41
Document Index: 728626926

Matched Legal Cases: ['art 87', '§ 87', '§ 87', '§ 87', '§ 87', '§ 87', '§ 87', '§ 87', '§ 87', '§ 87']

40 CFR 87.23 - Exhaust emission standards for Tier 6 and Tier 8 engines. | US Law | LII / Legal Information Institute
CFR › Title 40 › Chapter I › Subchapter C › Part 87 › Subpart C › Section 87.23 40 CFR 87.23 - Exhaust emission standards for Tier 6 and Tier 8 engines.
§ 87.23 Exhaust emission standards for Tier 6 and Tier 8 engines.
This section describes the emission standards that apply for Tier 6 and Tier 8 engines. The standards of this section apply for aircraft engines manufactured on or after July 18, 2012, except where we specify that they apply differently by year, or where the engine is exempt from one or more standards of this section. Except as specified in paragraph (d) of this section, these standards apply based on the date the engine is manufactured. 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 § 87.60. The tier of standards identified for an engine relates to NOX emissions and that the specified standards for HC, CO, and smoke emissions apply independent of the changes to the NOX emission standards.
Table 1 to § 87.23 - Smoke and Gaseous Emission Standards for New Supersonic Engines Rated output Smoke number HC (g/kN rated
output) NOX (g/kN rated
output) CO (g/kN rated
output) rO <26.7 kN
140 · 0.92rPR
36 2.42 · rPR
4550 · rPR−1.03
rO ≥ 26.7 kN
83.6 · rO−0.274 or 50.0, whichever is smaller
Table 2 to § 87.23 - Smoke, HC, and CO Standards for New Subsonic Turbofan or Turbojet Engines
rO <26.7 kN
rO ≥26.7 kN
Table 3 to § 87.23 - Tier 6 NOX Standards for New Subsonic Turbofan or Turbojet Engines With Rated Output Above 26.7 kN
If the rated pressure ratio is - and the rated output (in kN) is - The NOX emission standard (in g/kN rated output) is - rPR ≤30
26.7 <rO ≤89
38.5486 1.6823·rPR − 0.2453·rO − 0.00308·rPR·rO
rO >89
16.72 1.4080·rPR
30 <rPR <82.6
46.1600 1.4286·rPR − 0.5303·rO 0.00642·rPR·rO
−1.04 2.0·rPR
rPR ≥82.6
32 1.6·rPR
Table 4 to § 87.23 - Tier 8 NOX Standards for New Subsonic Turbofan or Turbojet Engines With Rated Output Above 26.7 kN
40.052 1.5681·rPR − 0.3615·rO − 0.0018·rPR·rO
7.88 1.4080·rPR
30 <rPR <104.7
41.9435 1.505·rPR − 0.5823·rO 0.005562·rPR·rO
−9.88 2.0·rPR
rPR ≥104.7
(1) Engine type certificate families certificated with characteristic levels at or below the Tier 4 NOX standards of § 87.21 (as applicable based on rated output and rated pressure ratio) and introduced before July 18, 2012 may be produced through December 31, 2012 without meeting the Tier 6 NOX standards of paragraph (c)(2) of this section. This also applies for engines that are covered by the same type certificate and are determined to be derivative engines for emissions certification purposes under the requirements of this part. Note that after this production cutoff date for the Tier 6 NOX standards, such engines may be produced only if they are covered by an exemption under § 87.50. This production cutoff does not apply to engines installed (or delivered for installation) on military aircraft.
(3) An engine manufacturer may produce up to six newly manufactured Tier 4 engines on or after July 18, 2012, subject to the provisions of this paragraph (d)(3). Tier 4 engines meeting the criteria of this paragraph (d)(3) are excepted without request from the otherwise applicable Tier 6 NOX emission standard. To be eligible for this exception the engines must have a date of manufacture prior to August 31, 2013 and be fully compliant with all requirements applicable to Tier 4 engines. The manufacturer must include these engines in the report required by § 87.50. This exception is void for any manufacturer that produces more than six excepted engines under this paragraph.