[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: 40CFR90.105]

[Page 178-179]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 90--CONTROL OF EMISSIONS FROM NONROAD SPARK-IGNITION ENGINES AT OR 
BELOW 19 KILOWATTS--Table of Contents
 
       Subpart B--Emission Standards and Certification Provisions
 
Sec. 90.105  Useful life periods for Phase 2 engines.

    (a) Manufacturers shall declare the applicable useful life category 
for each engine family at the time of certification as described in this 
section. Such category shall be the category which most closely 
approximates the expected useful lives of the equipment into which the 
engines are anticipated to be installed as determined by the engine 
manufacturer. Manufacturers shall retain data appropriate to support 
their choice of useful life category for each engine family. Such data 
shall be furnished to the Administrator upon request.
    (1) For nonhandheld engines: Manufacturers shall select a useful 
life category from Table 1 of this section at the time of certification. 
Engines with gross power output greater than 19 kW that have an engine 
displacement less than or equal to one liter that optionally certify 
under this part as allowed in Sec. 90.1(a), must certify to a useful 
life period of 1,000 hours.
    (2) Table 1 follows:

     Table 1: Useful Life Categories for Nonhandheld Engines [hours]
------------------------------------------------------------------------

------------------------------------------------------------------------
Class I...........................................    125    250     500
Class II..........................................    250    500    1000
Class I-A.........................................     50    125     300
Class I-B.........................................    125    250     500
------------------------------------------------------------------------

    (3) For handheld engines: Manufacturers shall select a useful life 
category from Table 2 of this paragraph (a) at the time of 
certification.
    (4) Table 2 follows:

      Table 2: Useful Life Categories for Handheld Engines (Hours)
------------------------------------------------------------------------

------------------------------------------------------------------------
Class III..........................................     50    125    300
Class IV...........................................     50    125    300
Class V............................................     50    125    300
------------------------------------------------------------------------

    (5) Data to support a manufacturer's choice of useful life category, 
for a given engine family, may include but are not limited to:
    (i) Surveys of the life spans of the equipment in which the subject 
engines are installed;
    (ii) Engineering evaluations of field aged engines to ascertain when 
engine performance deteriorates to the point

[[Page 179]]

where usefulness and/or reliability is impacted to a degree sufficient 
to necessitate overhaul or replacement;
    (iii) Warranty statements and warranty periods;
    (iv) Marketing materials regarding engine life;
    (v) Failure reports from engine customers; and
    (vi) Engineering evaluations of the durability, in hours, of 
specific engine technologies, engine materials or engine designs.
    (b) [Reserved]

[64 FR 15238, Mar. 30, 1999, as amended at 65 FR 24307, Apr. 25, 2000]