@wantion - Three Chinese warships, two Chinese patrol/SAR vessels, the Chinese icebreaker Xue Long, and HMAS Success.
The warships are the amphibious landing ship Kunlunshan, the missile destroyer Haikou and the supply ship Qiandaohu.
Rescue vessels Haixun 01 and Nanhaijiu 101 have also been tasked to the search area. These are high-speed Coastguard-style patrol vessels around 1500 tons. They're nearly new and cutting edge patrol vessels.
They have helipads and high-speed, crane-launched inflatables, and it appears that at least the Haikou has one helicopter aboard.
The Kunlunshan is reported as carrying 4 x Frelon Z-8 helicopters. The Haikou is reported as carrying 1 x Kamov KA-27 or 1 x Harbin Z-9C. The Qiandaohu is reported as having 1 x Frelon Z-8.
No helicopter on the HMAS Success, debris recovery by the Success is by launch of small craft.
The Success tried unsuccessfuly to recover the debris spotted Monday afternoon by aircraft, on Monday night, but failed to find the reported debris and had to leave the area due to deteriorating weather and sea conditions.
Type 071 Amphibious dock ship - Kunlunshan -
Type 071 amphibious transport dock - Wikipedia, the free encyclopedia
Type 052C destroyer - Haikou -
Type 052C destroyer - Wikipedia, the free encyclopedia
Type 903 supply ship - Qiandaohu -
Type 903 replenishment ship - Wikipedia, the free encyclopedia
China´s largest rescue vessel Haixun 01 heads toward Singapore CCTV News - CNTV English
Chinese rescue vessel Nanhaijiu 101 heads toward Singapore - Xinhua | English.news.cn