(案例分析)4 月3 日，某航A321 执行广州-普吉航班，在普吉机场三次复飞，后飞往槟城备降，在槟城再次复飞，重新进近着陆，落地时油量仅853公斤，根据公司A320机型的燃油管理规定，目的地机场挡板油量4300公斤、备降机场挡板油量2100公斤。请分析此案例中机组存在的问题有哪些？（cases analysis）On April, 3rd, an A321 flight from Guangzhou to Phuket of one airline performed go around for three times at Phuket airport, later airplane divert to Penang as alternate airport and carried go around again and made approach and landing with fuel quantity remianed only 853kg. According to the regulations of fuel management of A320 family in company, the minimum released fuel quantity of destination airport is 4300kg and that of alternate airport is 2100kg. Based upon this case, what are the problem existed on crew?