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 § 34.60 .
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 [LESS THAN EQUAL TO] 30 | 26.7 [LESS THAN] rO [LESS THAN EQUAL TO] 89.0 | 38.5486 + 1.6823 (rPR) - 0.2453 (rO) - (0.00308 (rPR) (rO)). |
rO [GREATER THAN] 89.0 | 16.72 + 1.4080 (rPR). | ||
30 [LESS THAN] rPR [LESS THAN] 82.6 | 26.7 [LESS THAN] rO [LESS THAN EQUAL TO] 89.0 | 46.1600 + 1.4286 (rPR) - 0.5303 (rO) + (0.00642 (rPR) (rO)). | |
rO [GREATER THAN] 89.0 | -1.04 + 2.0 (rPR). | ||
rPR [GREATER THAN EQUAL TO] 82.6 | rO [GREATER THAN EQUAL TO] 26.7 | 32 + 1.6 (rPR). |
Gaseous Emission Standards for Supersonic Engines
Class | Rated output rO1 (kN) | NOX (g/kN) | CO (g/kN) |
TSS | All | 36 + 2.42 (rPR) | 4,550 (rPR)-1.03 |
1 rO is the rated output with afterburning applied.
Tier 8 Oxides of Nitrogen Emission Standards for Subsonic Engines
Class | Rated pressure ratio-rPR | Rated output rO (kN) | NOX (g/kN) |
TF, T3, T8 | rPR [LESS THAN EQUAL TO] 30 | 26.7 [LESS THAN] rO [LESS THAN EQUAL TO] 89.0 | 40.052 + 1.5681 (rPR) - 0.3615 (rO) - (0.0018 (rPR) (rO)). |
rO [GREATER THAN] 89.0 | 7.88 + 1.4080 (rPR). | ||
30 [LESS THAN] rPR [LESS THAN] 104.7 | 26.7 [LESS THAN] rO [LESS THAN EQUAL TO] 89.0 | 41.9435 + 1.505 (rPR) - 0.5823 (rO) + (0.005562 (rPR) (rO)). | |
rO [GREATER THAN] 89.0 | -9.88 + 2.0 (rPR). | ||
rPR [GREATER THAN EQUAL TO] 104.7 | rO [GREATER THAN EQUAL TO] 26.7 | 32 + 1.6 (rPR). |
14 C.F.R. §34.23