Selected Acquisition Report (SAR): E-2D Advanced Hawkeye Aircraft (E-2D AHE) as of FY 2015 President's Budget [open pdf - 1MB]
"The E-2D AHE [Advanced Hawkeye Aircraft] program was granted authority on March 1, 2013 to commence Full Rate Production (FRP). A contract for production of the first FRP lot of five E-2D AHE aircraft was awarded on July 24, 2013. [...] The program plans to have an In-Progress Review conducted by the Assistant Secretary of Defense for Acquisition in the second quarter of FY 2014 prior to proceeding with the FRP Lot 2 production contract which is planned to be a Multi-Year Procurement (MYP). A Secretary of Defense certification for a MYP of 32 E-2D AHE aircraft during FY 2014-2018 was made on March 1, 2013, and the FY 2014 National Defense Authorization Act contains E-2D AHE MYP authority language. The FY 2015 PB [President's Budget] provides for 25 MYP aircraft. The FY 2014 RDT&E [Research, Development, Test, and Evaluation] budget reduction adds risk to meeting the planned AR [Acquisition Report] IOC [Initial Operational Capability]. There are no significant software-related issues with this program at this time."
Defense Technical Information Center (DTIC): http://www.dtic.mil/