Large Spark-Ignition (LSI) Engine Fleet Requirements Regulation 

This page last reviewed November 09, 2015


Guidance Documents and Advisories



(All documents are provided in Adobe Acrobat (PDF) unless otherwise indicated.)

Implementation advisories concerning the Off-Road Large Spark-Ignition Equipment regulation:

  • 08-01: Delay in Enforcement of first LSI Compliance Date. Allow Purchase Orders into Flee t Average Calculation.

  • 08-02: Exclusion of Gasoline-Fueled Ground Support Equipment from the LSI Fleet Adverage Calculation.

  • 08-03: Exclude from the fleet average calculation fully controlled late model year LSI equipment fleets and LSI equipment with engines greater than three liters in displacement ; Extend deadline for use of purchase orders in the fleet average calculations.

  • Mail-Out #MSC 09-44: EXCLUSION OF GASOLINE-FUELED AIRPORT GROUND SUPPORT EQUIPMENT FROM THE LARGE SPARK IGNITION (LSI) ENGINE FLEET AVERAGE REQUIREMENTS

  • Mail-Out #MSC 09-45: INCLUSION OF ELECTRIC EQUIPMENT OF LESS THAN 19 KILOWATTS IN LARGE SPARK IGNITION (LSI) FLEET AVERAGE CALCULATIONS

  • Mail-Out #MSC 10-08: EXCLUSION OF RETIRED LARGE SPARK IGNITION (LSI) ENGINE EQUIPMENT FROM FLEET SIZE DETERMINATIONS AND FLEET AVERAGE CALCULATIONS

  • Mail-Out #MSC 10-15: EXCLUSION OF GREATER THAN THREE LITER DISPLACEMENT LARGE SPARK IGNITION (LSI) ENGINE EQUIPMENT FROM THE LSI FLEET AVERAGE CALCULATIONS UNTIL APRIL 16, 2011

  • Mail-Out #MSC 10-16: EXCLUSION OF FULLY CONTROLLED LATE MODEL YEAR LARGE SPARK IGNITION (LSI) ENGINE EQUIPMENT FROM THE LSI FLEET AVERAGE CALCULATIONS UNTIL APRIL 16, 2011

  • Mail-Out #MSC 11-20: EXCLUSION OF GREATER THAN THREE LITER DISPLACEMENT LARGE SPARK IGNITION (LSI ) ENGINE EQUIPMENT FROM THE LSI FLEET AVERAGE CALCULATIONS UNTIL APRIL 16, 2012

  • Mail-Out #MSC 11-21: EXCLUSION OF FULLY CONTROLLED LATE MODEL YEAR LARGE SPARK IGNITION (LSI) ENGINE EQUIPMENT FROM THE LSI FLEET AVERAGE CALCULATIONS UNTIL APRIL 16, 2012

  • Mail-Out #MSC 11-22: EXCLUSION OF LIMITED HOURS OF USE EQUIPMENT FROM THE LARGE SPARK IGNITION (LSI) ENGINE FLEET AVERAGE REQUIREMENTS

Enforcement advisories concerning the Off-Road Spark-Ignition Equipment regulation:

  • Advisory 441: ENFORCEMENT OF THE IN-USE OFF-ROAD LARGE SPARK-IGNITION ENGINE FLEET REGULATION




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