The last person to be charged with corruption in the Airport Express piling scandal landed at Chek Lap Kok airport last night after being escorted from New York by ICAC officers. Hui Wai-chung, 38, arrived at about 6pm. He was arrested by FBI officers in May at his New York home and would have been extradited to the SAR, but the Independent Commission Against Corruption said Hui had agreed to return voluntarily. He faces one charge of bribery and one of conspiracy to defraud, a commission spokeswoman said yesterday. Hui was spending the night at the commission's headquarters and is expected to appear in court today. He left Hong Kong before the commission started investigating the faulty piling scam in 1998. Hui is accused of ordering workers to install substandard piling at the northern end of Hong Kong station and offering an engineer $50,000 in bribes to implement the scam. Inspections later revealed that 83 of the 87 piles sunk by Hui's company, On Foundation Engineering, were between one and 15 metres shorter than required. Twelve other people have been tried and sentenced to prison over the piling scam. Sentences varied from one year to nearly four. The construction industry has been plagued by a spate of piling scams, most recently substandard piling at two 34-storey public housing blocks at Yuen Chau Kok, Sha Tin, that contributed to the resignation of Housing Authority chairwoman Rosanna Wong Yick-ming last month. The commission also announced yesterday that complaints of graft in the construction industry in the past six months had increased by 15 per cent compared with the same period last year. In the first six months of this year there were 1,886 complaints compared with 1,641 for the same period in 1999.