(a) The following definitions apply for this Appendix III:

(1) Percent power means the percentage of the maximum power achieved at Maximum Test Speed (or at Maximum Test Torque for constant-speed engines).

(2) Percent speed means the percentage of Maximum Test Speed.

(b) Figure 1 of this Appendix illustrates the default NTE zone for marine engines certified using the duty cycle specified in §1042.505(b)(1), except for variable-speed propulsion marine engines used with controllable-pitch propellers or with electrically coupled propellers, as follows:

(1) Subzone 1 is defined by the following boundaries:

(i) Percent power ÷ 100 > 0.7 ·  (percent speed ÷ 100)2.5.

(ii) Percent power ÷ 100 ≤ (percent speed ÷ 90)3.5.

(iii) Percent power ÷ 100 ≥ 3.0 ·  (1−percent speed ÷ 100).

(2) Subzone 2 is defined by the following boundaries:

(i) Percent power ÷ 100 ≥ 0.7 ·  (percent speed ÷ 100)2.5.

(ii) Percent power ÷ 100 ≤ (percent speed ÷ 90)3.5.

(iii) Percent power ÷ 100 < 3.0 ·  (1−percent speed ÷ 100).

(iv) Percent speed ÷ 100 ≥ 0.7.

(3) Note that the line separating Subzone 1 and Subzone 2 includes the following endpoints:

(i) Percent speed = 78.9 percent; Percent power = 63.2 percent.

(ii) Percent speed = 84.6 percent; Percent power = 46.1 percent.

(c) Figure 2 of this Appendix illustrates the default NTE zone for recreational marine engines certified using the duty cycle specified in §1042.505(b)(2), except for variable-speed marine engines used with controllable-pitch propellers or with electrically coupled propellers, as follows:

(1) Subzone 1 is defined by the following boundaries:

(i) Percent power ÷ 100 ≥ 0.7 ·  (percent speed ÷ 100)2.5.

(ii) Percent power ÷ 100 ≤ (percent speed ÷ 90)3.5.

(iii) Percent power ÷ 100 ≥ 3.0 ·  (1−percent speed ÷ 100).

(iv) Percent power ≤ 95 percent.

(2) Subzone 2 is defined by the following boundaries:

(i) Percent power ÷ 100 ≥ 0.7 ·  (percent speed ÷ 100)2.5.

(ii) Percent power ÷ 100 ≤ (percent speed ÷ 90)3.5.

(iii) Percent power ÷ 100 < 3.0 ·  (1−percent speed ÷ 100).

(iv) Percent speed ≥ 70 percent.

(3) Subzone 3 is defined by the following boundaries:

(i) Percent power ÷ 100 ≤ (percent speed ÷ 90)3.5.

(ii) Percent power > 95 percent.

(4) Note that the line separating Subzone 1 and Subzone 3 includes a point at Percent speed = 88.7 percent and Percent power = 95.0 percent. See paragraph (b)(3) of this appendix regarding the line separating Subzone 1 and Subzone 2.

(d) Figure 3 of this Appendix illustrates the default NTE zone for variable-speed marine engines used with controllable-pitch propellers or with electrically coupled propellers that are certified using the duty cycle specified in §1042.505(b)(1), (2), or (3), as follows:

(1) Subzone 1 is defined by the following boundaries:

(i) Percent power ÷ 100 ≥ 0.7 ·  (percent speed ÷ 100)2.5.

(ii) Percent power ÷ 100 ≥ 3.0 ·  (1−percent speed ÷ 100).

(iii) Percent speed ≥ 78.9 percent.

(2) Subzone 2a is defined by the following boundaries:

(i) Percent power ÷ 100 ≥ 0.7 ·  (percent speed ÷ 100)2.5.

(ii) Percent speed ≥70 percent.

(iii) Percent speed <78.9 percent, for Percent power >63.3 percent.

(iv) Percent power ÷ 100 <3.0 · (1−percent speed ÷ 100), for Percent speed ≥78.9 percent.

(3) Subzone 2b is defined by the following boundaries:

(i) The line formed by connecting the following two points on a plot of speed-vs.-power:

(A) Percent speed = 70 percent; Percent power = 28.7 percent.

(B) Percent power = 40 percent; Speed = governed speed.

(ii) Percent power ÷ 100 < 0.7 ·  (percent speed ÷ 100)2.5.

(4) Note that the line separating Subzone 1 and Subzone 2a includes the following endpoints:

(i) Percent speed = 78.9 percent; Percent power = 63.3 percent.

(ii) Percent speed = 84.6 percent; Percent power = 46.1 percent.

(e) Figure 4 of this Appendix illustrates the default NTE zone for constant-speed engines certified using a duty cycle specified in §1042.505(b)(3) or (4), as follows:

(1) Subzone 1 is defined by the following boundaries:

(i) Percent power ≥70 percent.

(ii) [Reserved]

(2) Subzone 2 is defined by the following boundaries:

(i) Percent power <70 percent.

(ii) Percent power ≥40 percent.

(f) Figure 5 of this Appendix illustrates the default NTE zone for variable-speed auxiliary marine engines certified using the duty cycle specified in §1042.505(b)5)(ii) or (iii), as follows:

(1) The default NTE zone is defined by the boundaries specified in 40 CFR 86.1370(b)(1), (2), and (4).

(2) A special PM subzone is defined in 40 CFR 1039.515(b).

[81 FR 74157, Oct. 25, 2016]