[F1ANNEX XVIII U.K. SPECIFIC TECHNICAL REQUIREMENTS FOR DUAL-FUEL ENGINES AND VEHICLES

5. Performance requirements U.K.

5.1. Emission limits applicable to Type 1A and Type 1B dual-fuel engines U.K.

5.1.1. The emission limits applicable to Type 1A and Type 1B dual-fuel engines operating in dual-fuel mode are those set for PI engines in Annex I to Regulation (EC) No 595/2009. U.K.
5.1.2. The emission limits applicable to Type 1B dual-fuel engines operating in diesel mode are those set for CI engines in Annex I to Regulation (EC) No 595/2009. U.K.

5.2. Emission limits applicable to Type 2A and Type 2B dual-fuel engines U.K.

5.2.1. Emission limits applicable over the WHSC test-cycle U.K.

For Type 2A and Type 2B dual-fuel engines operating in both diesel and dual-fuel mode, the exhaust emission limits, including the PM number limit, over the WHSC test-cycle are those applicable to CI engines over the WHSC test-cycle as set in Annex I to Regulation (EC) No 595/2009.

5.2.2. Emission limits applicable over the WHTC test-cycle U.K.
5.2.2.1. Emission limits for CO, NO x , NH 3 and PM mass in dual-fuel mode U.K.

The CO, NO x , NH 3 and PM mass emission limits over the WHTC test-cycle applicable to Type 2A and Type 2B dual-fuel engines operating in dual-fuel mode are those applicable to both CI and PI engines over the WHTC test-cycle as set in Annex I to Regulation (EC) No 595/2009.

5.2.2.2. Emission limits for Hydrocarbons in dual-fuel mode U.K.
5.2.2.2.1. Natural Gas/Biomethane engines U.K.

The THC, NMHC and CH 4 emission limits over the WHTC test-cycle applicable to Type 2A and Type 2B dual-fuel engines operating with Natural Gas/Biomethane in dual-fuel mode are calculated from those applicable to CI and PI engines over the WHTC test-cycle as set in Annex I to Regulation (EC) No 595/2009, in accordance with the calculation procedure specified in paragraph 5.2.3 of Annex 15 to UNECE Regulation No 49.

5.2.2.2.2. LPG engines U.K.

The THC emission limits over the WHTC test-cycle applicable to Type 2A and Type 2B dual-fuel engines operating with LPG in dual-fuel mode are those applicable to CI engines over the WHTC test-cycle as set in Annex I to Regulation (EC) No 595/2009.

5.2.2.3. Emission limits for PM number in dual-fuel mode U.K.

The PM number limit over the WHTC test-cycle applicable to Type 2A and Type 2B dual-fuel engines operating in dual-fuel mode are calculated from those applicable to CI and PI engines over the WHTC test-cycle as set in Annex I to Regulation (EC) No 595/2009, in accordance with the calculation procedure specified in paragraph 5.2.4 of Annex 15 to UNECE Regulation No 49.

5.2.2.4. Emission limits in diesel mode U.K.

The emission limits, including the PM number limit, over the WHTC test-cycle applicable to Type 2B dual-fuel engines operating in diesel mode are those set for CI engines in Annex I to Regulation (EC) No 595/2009.

5.3. Emission limits applicable to Type 3B dual-fuel engines U.K.

The emissions limits applicable to Type 3B dual-fuel engines whether operating in dual-fuel mode or in diesel mode are the exhaust emission limits applicable to CI engines as set in Annex I to Regulation (EC) No 595/2009.]