[Code of Federal Regulations]
[Title 40, Volume 18]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR91.305]

[Page 318-319]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 91--CONTROL OF EMISSIONS FROM MARINE SPARK-IGNITION ENGINES--Table of 
Contents
 
              Subpart D--Emission Test Equipment Provisions
 
Sec. 91.305  Dynamometer specifications and calibration accuracy.

    (a) Dynamometer specifications. (1) The dynamometer test stand and 
other instruments for measurement of engine speed and torque must meet 
the accuracy requirements shown in Table 2 in appendix A to this 
subpart. The dynamometer must be capable of performing the test cycle 
described in Sec. 91.410.
    (b) Dynamometer calibration accuracy. (1) The dynamometer test stand 
and other instruments for measurement of engine torque and speed must 
meet the calibration frequency shown in Table 2 in appendix to this 
subpart.

[[Page 319]]

    (2) A minimum of three calibration weights for each range used is 
required. The weights must be equally spaced and traceable to within 0.5 
percent of National Institute of Standards and Testing (NIST) weights. 
Laboratories located in foreign countries may certify calibration 
weights to local government bureau standards.