169. The representative from the United States of America on behalf of the sponsors (Japan, the Republic of Korea and the European Union) of the IWG on UN GTR No. 13 – Phase 2, reported to AC.3 on the last IWG meeting (17–20 June 2019) in Tianjin, China. She stated that under Phase 2 of the UN GTR, the task forces and subgroups of IWG are working on issues such as the expansion of the scope of the UN GTR to cover heavy-duty vehicles and buses, material compatibility, tank stress rupture, fire test parameters and further clarification of existing GTR test procedures. Overall, she added that IWG was on track, however, some items had proven to be more complex and challenging and additional work may be necessary. She added, that task force work would continue on heavy duty vehicles and buses, fuelling receptacle requirements, fire tests and test procedure recommendations. In addition, subgroups were looking at issues such as initial burst pressure, material compatibility and humid gas stress corrosion cracking. She informed AC.3 that the seventh meeting of IWG was scheduled for November 2019, and would be held in Germany. She informed AC.3 that the meeting materials were available on the dedicated part of the website for the IWG on hydrogen fuel cell vehicle GTR Phase 2.