G/TBT/N/USA/1620/Rev.1/Add.1/Corr.2  
 
27 October 2022  
(22-8084) Page: 1/4 
Committee on Technical Barriers to Trade  Original: English  
 
  
NOTIFICATION  
Corrigendum  
The following communication, dated 27 October 2022, is being circulated at the request of the 
delegation of the United States of America . 
 
_______________  
 
 
TITLE: Improvements for Heavy -Duty Engine and Vehicle Test Procedures, and Other Technical 
Amendmen ts 
Corrections  
https://www.govinfo.gov/content/pkg/FR -2022-10-26/html/C2 -2021-05306.htm  
https://www.govinfo.gov/content/pkg/FR -2022-10-26/pdf/C2 -2021-05306.pdf  
 
In rule document 2021 -05306, appearing on pages 34308 -34590, in the issue of Tuesday, 29 June 
2021, make the following corrections:  
Sec. 1036.301 [Corrected]  
 
1. On page 34380, in the first column, in the sixth line above Table 1, "Mreduction" should read 
"Mreduction".  
Sec. 1036.540 [Corrected]  
 
2. On page 34396, in the first column, at the top of the page, before (i) insert:  
"(3) Run GEM for each simulated vehi cle configuration as follows:"  
Sec. 1037.528 [Corrected]  
 
3. On page 34474, in the third column, after amendatory instruction 152, the section heading should 
read:  
Sec. 1037.528 Coastdown procedures for calculating drag area (CdA).  
Sec. 1037.540 [Corrected ] 
 
4. On page 34477, in the second column, in the tenth line below Eq. 1037.540 -2, "pcircuit -2" should 
read "pcircuit -2" 
Sec. 1037.550 [Corrected]  
 
5. On page 34479, in the third column in paragraph (f)(4),  
"k[alpha]B = 4.0" should read "kaB = 4.0".  
 
6. On page 34481, in Table 1 of Sec. 1037.550, in the first column, in the first line, "Slope, a;1" 
should read "Slope, a1".  
Sec. 1037.560 [Corrected]  
 
7. On page 34485, in the first column, paragraph (f) introductory text should read:  
(f) Calculate the mean power loss, Ploss, at each test point as follows:  
 
8. On the same page, in the second column, (f)(2) should read:  
(2) Calculate Ploss as the mean power loss from all measurements at a given test point.  
 
9. On the same page, in the third column (f)(3) shoul d read:  G/TBT/N/USA/1620/Rev.1/Add.1/Corr.2  
 
- 2 - 
 
  (3) The following example illustrates a calculation of Ploss:  
* * * * *  
10. On the same page, in the first column paragraph (g) introductory text should read:  
(g) Create a table with the mean power loss, Ploss, corresponding to each test point for input into 
GEM. Express wheel angular speed in r/min to one decimal place; express output torque in 
N[middot]m to two decimal places; express power loss in kW to four decimal places.  
 
11. On the same page, in the third column, (h)(3) should read:  
(3) D etermine Ploss of untested axles for each speed and torque setpoint based on a linear 
relationship between your declared power loss and axle ratio as follows:  
* * * * *  
 
12. On page 34486, in the first column, (h)(4) should read:  
(4) Select declared values  of Ploss for untested configurations that are at or above the values you 
determined in paragraph (h)(3) of this section.  
Sec. 1037.565 [Corrected]  
 
13. On page 34487, in the first column, paragraph (f) introductory text should read:  
(f) Calculate the mean  power loss, Ploss, at each operating condition as follows:  
* * * * *  
14. On the same page, in the second column, the definition for fnout and paragraph (f)(2) 
introductory text should read as  
follows:  
fnout = mean output shaft speed from paragraph (e)(6) of this section in rad/s. Let fnout = 0 for all 
tests with the transmission in neutral. See paragraph (f)(2) of this section for calculating fnout as a 
function of fnin instead of measuring fnout.  
(2) For transmissions that are configured to not allow slip , you may calculate fnout based on the 
gear ratio using the following equation:  
* * * * *  
15. On the same page, in the third column, paragraph (f)(3), paragraph (f)(4) introductory text, 
and the eighth line after paragraph (f)(4) introductory text should r ead as follows:  
(3) Calculate Ploss as the mean power loss from all measurements at a given operating condition.  
(4) The following example illustrates a calculation of Ploss:  
* * * * *  
Ploss,3 = 4292 W = 4.292 kW  
* * * * *  
16. On page 34488, in the first c olumn, lines 1 -3 from the top of the page should read:  
(g) Create a table with the mean power loss, Ploss, corresponding to each operating condition for 
input into GEM.  
Sec. 1037.570 [Corrected]  
 
17. On page 34489, beginning in the second column, lines 17 -20 from the top should read as follows:  
(e) Calculate the mean torque ratio, l, at each tested speed ratio, v, as follows:  
(1) Calculate [mu] at each tested speed ratio as follows:  
 
18. On the same page, in the same column, in the 6th through 10 l ines after Eq. 1037.570 -1, 
paragraphs (e)(2) and (3) introductory text  
should read as follows:  
(2) Calculate l as the average of the two values of [mu] at each tested speed ratio.  
(3) The following example illustrates a calculation of l:  
* * * * *  
 
19. On the same page, in the third column, paragraphs (f) introductory text, (f)(1) introductory text, 
(f)(2), and (f)(3) introductory text should read as follows:  
(f) Calculate the mean capacity factor, k, at each tested speed ratio, n, as follows:  
(1) Calcul ate K at each tested speed ratio as follows:  
* * * * *  
(2) Calculate k as the average of the two values of K at each tested speed ratio.  
(3) The following example illustrates a calculation of k:  
* * * * *  
 
20. On the same page, in the first column, beginni ng in the 7th line from the bottom, paragraph (g)  G/TBT/N/USA/1620/Rev.1/A dd.1/Corr.2  
 
- 3 - 
 
  should read as follows:  
(g) Create a table of GEM inputs showing l and k at each tested speed ratio, n. Express l to two 
decimal places; express k to one decimal place; express n to two decimal places.  
Sec. 1037.805 [Corrected]  
 
21. On page 34493, in Table 2 to Sec. 1037.805 --Symbols for Quantities, in the first column,  
a. line 7 should read: ag  
b. line 8 should read: a0  
c. line 9 should read: a1  
 
22. On page 34494, in the second column, in Table 3 to Sec. 1 037.805 --Superscripts, in the first 
column, the second and third lines should read:  
Double overbar (such as y)  
Sec. 1065.307 [Corrected]  
 
23. On page 34538, in the first column, in (c)(13), the first sentence should read as follows:  
(13) Use the arithmetic means, yi, and reference values, yrefi, to calculate least -squares linear 
regression parameters and statistical values to compare to the minimum performance criteria 
specified in Table 1 of this section.  
 
24. On page 34539, in the second column,  in paragraph (e)(3), (v) and (vi) should read as follows:  
(v) For linearity verification of a fuel flow rate meter, mmax is the manufacturer's specified maximum 
fuel rate of the lowest -power engine expected during testing.  
(vi) For linearity verification of a DEF flow rate meter, mmax is 10% of the manufacturer's specified 
maximum fuel rate of the lowest -power DEF -using engine expected during testing.  
Sec. 1065.530 [Corrected]  
 
25. On page 34547, in the first column, paragraph (g)(5) should read as follows : 
(g) * * *  
(5) If you perform carbon balance error verification, verify carbon balance error as specified in the 
standard -setting part and Sec.  
1065.543. Calculate and report the three carbon balance error quantities for each test interval; 
carbon mass ab solute error for a test interval ([epsi]aC), carbon mass rate absolute error for a test 
interval ([epsi]aCrate), and carbon mass relative error for a test interval ([epsi]rC). For duty cycles 
with multiple test intervals, you may calculate and report the c omposite carbon mass relative error, 
[epsi]rCcomp, for the whole duty cycle. If you report [epsi]rCcomp, you must still calculate and 
report [epsi]aC, [epsi]aCrate, and [epsi]rC for each test interval.  
* * * * *  
Sec. 1065.543 [Corrected]  
 
26. On page 34547 , in the second column, paragraph (b)(1) should read:  
(b) * * *  
(1) Calculate carbon balance error quantities as described in Sec. 1065.643. The three quantities for 
individual test intervals are carbon mass absolute error, [epsi]aC, carbon mass rate absol ute error, 
[epsi]aCrate, and carbon mass relative error, [epsi]rC. Determine [epsi]aC, [epsi]aCrate, and 
[epsi]rC for all test intervals. You may determine composite carbon mass relative error, 
[epsi]rCcomp, as a fourth quantity that optionally applies for  duty cycles with multiple test intervals.  
 
27. On the same page, in the same column, Eq. 1065.543 -1 should read:  
[GRAPHIC] [TIFF OMITTED] TR26OC22.008  
 
28. On the same page, in the third column, Eq. 1065.543 -2 should read:  
[GRAPHIC] [TIFF OMITTED] TR26OC2 2.009  
 
29. On the same page, in the same column, lines 12 -17 should read:  
[GRAPHIC] [TIFF OMITTED] TR26OC22.007  
(iii) The carbon mass relative error limit, L[egr]rC, is 0.020 for comparision to the absolute value of 
[epsi]rC, and optionally the absolute value of [epsi]rCcomp.  
Sec. 1065.602 [Corrected]  
 
30. On page 34554, in the third column, in (l)(1)(ii), in the 8th line down, "pumping, P" should read 
"pumping, Pfrict."  G/TBT/N/USA/1620/Rev.1/Add.1/Corr.2  
 
- 4 - 
 
  Sec. 1065.643 [Corrected]  
 
31. On page 34559, in the first column, Eq. 1065. 643-7 should read:  
[ograve]aC = mCexh -mCfluid - mCair  
 
32. On page the same page, in the third column, Eq. 1065.643 -8 should read:  
[GRAPHIC] [TIFF OMITTED] TR26OC22.000  
 
33. On the same page, beginning in the same column, Example: for Eq. 1065.643 -8 shoul d read:  
[epsi]aC = -6.7 g 
t = 1202.2 s = 0.3339 hr  
[GRAPHIC] [TIFF OMITTED] TR26OC22.001  
 
34. On the same page, in the second column, Eq. 1065.643 -9 should read:  
[GRAPHIC] [TIFF OMITTED] TR26OC22.002  
 
35. On the same page, beginning in the first column, Ex ample: for Eq.  
1065.643 -9 should read:  
[epsi]aC = -6.7 g 
mCfliud = 975.3 g  
mCair = 278.6 g  
[GRAPHIC] [TIFF OMITTED] TR26OC22.003  
 
36. On page 34560, at the top of the page, Eq. 1065.643 -10 should read:  
[GRAPHIC] [TIFF OMITTED] TR26OC22.004  
 
37. On the same page, in the first column, the formula before (iii) should read:  
[GRAPHIC] [TIFF OMITTED] TR26OC22.005  
 
38. On the same page, in the same column, the formula before amendatory instruction 353 should 
read:  
[GRAPHIC] [TIFF OMITTED] TR26OC22.006  
Sec. 106 5.650 [Corrected]  
 
39. On page 34561, in the third column, the fourth line after Eq. 1065.650 -8 should read:  
ndexh = 57.692 mol/s  
 
40. On page 34563, in the first column, the ninth through eleventh lines after Eq. 1065.650 -19 
should read:  
P = mean steady -state power over the test interval as described in paragraph (e) of this section.  
Sec. 1065.655 [Corrected]  
 
41. On page the same page, in Table 1 of Sec. 1065.655, delete column 1 and 2 headings and insert 
first entry to read as follows:  
Table 1 of Sec. 10 65.655 --Symbols and Subscripts for Chemical Balance Equations  
------------------------------------------------------------------------  
------------------------------------------------------------------------  
Xdil/exh..................... amount of dilution  gas or excess air per mole of exhaust.  
* * * * * * *  
------------------------------------------------------------------------  
Sec. 1065.1005 [Corrected]  
 
42. On page 34576, in Table 1 of Sec. 1065.1005, in the Symbol column, the first line should read 
"[alpha]".  
Sec. 1066.1005 [Corrected]  
 
43. On page 34585, in Table 1 of Sec. 1066.1005, in the Symbol column, the fifth line should read 
"Am" 
https://members.wto.org/crnattachments/2022/TBT/USA/22_7291_00_e.pdf  
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