Spirit's second quarter 2018 revenue was US$1.8 billion, up slightly from the same period of 2017. This increase was primarily driven by higher production deliveries on the Boeing 737 program, partially offset by lower production deliveries on the Boeing 777 program, lower revenue recognized on the Boeing 787 program as a result of the adoption of ASC 606, and the absence of a litigation reserve reversed in the second quarter of 2017.
Spirit's backlog at the end of the second quarter of 2018 was approximately US$47 billion, with work packages on all commercial platforms in the Boeing and Airbus backlog.
Operating income for the second quarter of 2018 was US$218 million, up compared to an operating loss of US$(92) million in the same period of 2017. This increase was primarily due to the absence of forward loss charges recognized on the Boeing 787 program in the second quarter of 2017. Forward loss charges of US$353 million on the Boeing 787 program were recorded during the second quarter of last year as a result of the signed memorandum of understanding (MOU) for agreement with Boeing. Second quarter EPS was US$1.31, compared to $(0.48) in the same period of 2017. Second quarter adjusted EPS was US$1.63, excluding the impact of the Asco acquisition and debt financing costs, up 4 percent compared to US$1.57 in the same period of 2017, adjusted to exclude the impact of the MOU with Boeing.
Cash from operations in the second quarter of 2018 was US$231 million, up compared to US$222 million in the same quarter last year. Adjusted free cash flow in the second quarter of 2018 was US$171 million, compared to adjusted free cash flow of US$175 million in the same quarter last year.