Section 1051.250 - What records must I keep and make available to EPA?(a) Send the Designated Compliance Officer information related to your U.S.-directed production volumes as described in § 1051.345 . In addition, within 45 days after the end of the model year, you must send us a report describing information about vehicles you produced during the model year as follows: (1) State the total production volume for each engine family that is not subject to reporting under § 1051.345 .(2) State the total production volume for any engine family for which you produce vehicles after completing the reports required in § 1051.345 .(3) For production volumes you report under this paragraph (a), identify whether or not the figures include California sales. Include a separate count of production volumes for California sales if those figures are available.(b) Organize and maintain the following records:(1) A copy of all applications and any summary information you send us.(2) Any of the information we specify in § 1051.205 that you were not required to include in your application.(3) A detailed history of each emission-data vehicle. For each vehicle, describe all of the following: (i) The emission-data vehicle's construction, including its origin and buildup, steps you took to ensure that it represents production vehicles, any components you built specially for it, and all the components you include in your application for certification.(ii) How you accumulated vehicle or engine operating hours, including the dates and the number of hours accumulated.(iii) All maintenance, including modifications, parts changes, and other service, and the dates and reasons for the maintenance.(iv) All your emission tests, including documentation on routine and standard tests, as specified in 40 CFR part 1065, and the date and purpose of each test.(v) All tests to diagnose engine or emission-control performance, giving the date and time of each and the reasons for the test.(vi) Any other significant events.(4) Production figures for each engine family divided by assembly plant.(5) Keep a list of engine identification numbers for all the engines you produce under each certificate of conformity.(c) Keep data from routine emission tests (such as test cell temperatures and relative humidity readings) for one year after we issue the associated certificate of conformity. Keep all other information specified in this section for eight years after we issue your certificate.(d) Store these records in any format and on any media, as long as you can promptly send us organized, written records in English if we ask for them. You must keep these records readily available. We may review them at any time. 70 FR 40497 , July 13, 2005, as amended at 73 FR 59250 , Oct. 8, 2008