Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p13
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 13/39)
Character Range: 1188964–1191939

is the one activated by the "severe inducement system" specified in Annex 11 or, in the special case described in paragraph 4.2.2.3., the power limitation described in that section.

       4.2.2.1. Activation of the operability restriction

              The operability restriction shall be automatically activated when the service mode is activated.

              In the case where the service mode is activated according to paragraph 4.2.3. because of a malfunction of the gas supply system or because of an abnormality of gas consumption, the operability restriction shall become active after the next time the vehicle is stationary or within 30 minutes operating time after the service mode is activated, whichever comes first.

              In the case where the service mode is activated because of an empty gas tank, the operability restriction shall become active as soon as the service mode is activated.

              4.2.2.2. De-activation of the operability restriction

               In case of an empty gas tank, the operability restriction in dual-fuel mode due to a lack of gaseous fuel, shall be de-activated as soon as the gas tank is refilled above the critical level.

              4.2.2.3. Repair and maintenance of LNG Type A dual-fuel engines and vehicles.

               In the case of LNG Type A dual-fuel engines and vehicles, the manufacturer may, instead of limiting the vehicle speed at 20 km/h, opt for limiting the power of the engine to 20 per cent of the declared maximum power in dual-fuel mode, and this at any engine speed, when the service mode is activated during a repair or maintenance operation.

              4.2.2.3.1. The power limitation option may only be activated if the system concludes that the gas tank is empty not later than 5 minutes after engine cranking, the engine being at idle.

              4.2.2.3.2. The power limitation option shall not be activated when the system concludes that the gas tank is empty from a previous driving cycle and the gas tank has not been refilled.

              4.2.2.3.3. The manufacturer shall demonstrate at type-approval that the power limitation option can only be activated during a repair or maintenance operation.

       4.2.3. Unavailability of gaseous fuel when operating in a dual-fuel mode

              In order to permit the vehicle to keep moving and eventually to move out of the main-stream traffic, upon detection of an empty gaseous fuel tank, or of a malfunctioning gas supply system according to paragraph 7.2., or of an abnormality of gas consumption in dual-fuel mode according to paragraph 7.3.:

                  (a) Dual-fuel engines of Types 1A and 2A shall activate the service mode;

                  (b) Dual-fuel engines of Types 1B, 2B and 3B shall operate in diesel mode.

       4.2.3.1. Unavailability of gaseous fuel – empty gaseous fuel tank

              In the case of an empty gaseous fuel tank, the service mode or, as appropriate