UNITED

NATIONS

Distr.

Economic and Social	GENERAL

Council	TRANS/WP.29/2001/4
13 December 2000

ENGLISH

Original: ENGLISH

and FRENCH

ECONOMIC COMMISSION FOR EUROPE

INLAND TRANSPORT COMMITTEE

World Forum for Harmonization of Vehicle Regulations (WP.29)

(One-hundred-and-twenty-third session,

6-9 March 2001, agenda item 4.2.10.)

DRAFT CORRIGENDUM 2 TO THE 01 SERIES OF AMENDMENTS

TO REGULATION No. 63

(Noise of mopeds)

Transmitted by the Working Party on Noise (GRB)

Note: The text reproduced below was adopted by GRB at its thirty-third session, and is transmitted for consideration to WP.29 and to AC.1. It is based on the text of document TRANS/WP.29/GRB/2000/5, not amended (TRANS/WP.29/GRB/31, para. 14).

__________

This document is a working document circulated for discussion and comments. The use of this document for other purposes is the entire responsibility of the user. Documents are also available via the INTERNET:

http://www.unece.org/trans/main/welcwp29.htm

GE.00-

Annex 3,

Paragraph 3.2.3.1., amend to read:

"3.2.3.1.	Nature and number of measurements

The maximum sound level expressed in A-weighted decibels (dB(A)) shall be measured during the period of operation laid down in paragraph 3.2.3.3.2.1. below.

At least three measurements shall be taken at each measuring	point."

Paragraph 3.2.3.3.2.2., amend to read:

"3.2.3.3.2.2.	When the constant engine speed is reached, the throttle shall be returned swiftly to the idle position. The sound level shall be measured during a period of operation consisting of a brief maintenance of the constant engine speed and throughout the deceleration period. "

Insert a new paragraph 3.2.3.3.3., to read:

"3.2.3.3.3.	The values rounded off to the nearest whole decibel, shall be read from the measuring apparatus. If the figure following the decimal point is between 0 and 4, the total is rounded down and if between 5 and 9, it is rounded up.

Only values which are obtained from three consecutive measurements which do not differ by more than 2 dB(A) shall be accepted.

The highest of the three measurements will constitute the test result."

__________