Low-Hour Engine

{
  "id": "MLC-T-ENV-016169",
  "term": "Low-Hour Engine",
  "field": "Environment",
  "definition": "1. Relating to an engine that is considered to have stabilized emissions and represents the undeteriorated emission level. A low-hour engine typically operates no more than a few hours beyond the minimum stabilization period. However, a low-hour engine could have more hours as long as emissions remain stable. In the absence of other information, a low-hour engine with a useful life of 300 hours or less would generally have operated no more than 15 hours and a low-hour engine with a longer useful life would generally have operated no more than 24 hours.\n\n2. Engine during the interval between the time that normal assembly operations and adjustments are completed and the time that 300 additional operating hours have been accumulated (including hours accumulated during emission testing if performed). [40 CFR 92.2 (CFR 2013)]\n\n3. Relating to an engine that has stabilized emissions and represents the undeteriorated emission level. This would generally involve less than 125 hours of operation.[40 CFR 1036.801 (CFR 2013)]\n\n4. Relating to an engine with stabilized emissions and represents the undeteriorated emission level. This would generally involve less than 300 hours of operation.\n\n5. Relating to an engine that has stabilized emissions and represents the undeteriorated emission level. This would generally involve less than 125 hours of operation for engines below 560 kW and less than 300 hours for engines at or above 560 kW.\n\n6. Relating to an engine that has stabilized emissions and represents the undeteriorated emission level. This would generally involve less than 30 hours of operation.\n\n7. Relating to a locomotive with stabilized emissions and represents the undeteriorated emission level. This would generally involve less than 300 hours of operation.\n\n8. ]Relating to an engine with stabilized emissions and represents the undeteriorated emission level. This would generally involve less than 24 hours or 240 kilometers of operation.\n\n9. Relating to an engine with stabilized emissions and represents the undeteriorated emission level. This would generally involve less than 300 hours of operation for engines with NOX aftertreatment and 125 hours of operation for other engines.[86 FR 34308; 40 CFR 1039.801 (CFR 2021)]",
  "references": [
    "40 CFR 1054.801 (CFR 2013)",
    "40 CFR 94.2 (CFR 2013)",
    "40 CFR 1048.801 (CFR 2013)",
    "40 CFR 1039.801 (CFR 2013)",
    "40 CFR 1042.901 (CFR 2013)",
    "40 CFR 1045.801 (CFR 2013)",
    "40 CFR 1033.901 (CFR 2013)",
    "40 CFR 1051.801 (CFR 2013)",
    "86 FR 34308; 40 CFR 1042.901 (CFR 2021)"
  ],
  "url": "https://mlchart.com/terminology/environment/low-hour-engine/"
}