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6 septembre 2013 5 06 /09 /septembre /2013 16:20
 Vue du futur USS Gerald R. Ford (CVN 78)  crédits : NORTHROP GRUMMAN

Vue du futur USS Gerald R. Ford (CVN 78) crédits : NORTHROP GRUMMAN

Sept. 6, 2013 defense-aerospace.com

(Source: Government Accountability Office; issued Sept. 5, 2013)


Ford-Class Carriers: Lead Ship Testing and Reliability Shortfalls Will Limit Initial Fleet Capabilities

The Navy faces technical, design, and construction challenges to completing Gerald R. Ford (CVN 78) that have led to significant cost increases and reduced the likelihood that a fully functional ship will be delivered on time.

The Navy has achieved mixed progress to date developing CVN 78’s critical technologies, such as a system intended to more effectively launch aircraft from the ship. In an effort to meet required installation dates aboard CVN 78, the Navy has elected to produce some of these systems prior to demonstrating their maturity—a strategy that GAO’s previous work has shown introduces risk of late and costly design changes and rework, and leaves little margin to incorporate additional weight growth in the ship.

In addition, progress in constructing CVN 78 has been overshadowed by inefficient out-of-sequence work, driven largely by material shortfalls, engineering challenges, and delays developing and installing critical technology systems. These events are occurring in a constrained budget environment, even as lead ship costs have increased by over 22 percent since construction authorization in fiscal year 2008—to $12.8 billion. Additional increases could follow due to uncertainties facing critical technology systems and shipbuilder underperformance.

The Navy’s strategy for providing timely demonstration of CVN 78 capabilities is hampered by post-delivery test plan deficiencies, Joint Strike Fighter aircraft delays, and reliability shortfalls affecting key ship systems. Additional risk is introduced due to the Navy’s plan to conduct integration testing of key systems with the ship at the same time as initial operational test and evaluation (IOT&E). This strategy will constrain opportunities to implement timely, corrective actions if problems are discovered with key ship systems. In addition, significant discoveries during IOT&E could delay demonstration of ship capabilities.

The Joint Strike Fighter, intended to operate with the carrier, has faced delays, and there is the likelihood of costly retrofits to the ship to accommodate the aircraft after CVN 78 is delivered to the Navy.

But even after the ship commissions, several key ship systems will continue to face significant reliability shortfalls that will likely increase costs to the government and limit the ship’s mission effectiveness. The extent of these limitations will not be known until after IOT&E. GAO contemplated making a recommendation to delay CVN 78 commissioning until the ship successfully completes IOT&E. However, based on additional information provided by DOD, GAO decided not to include this recommendation in the report.

The Navy and shipbuilder are implementing process improvements aimed at reducing the cost of the follow-on ship, John F. Kennedy (CVN 79), ahead of the main construction contract award for that ship, currently planned for September 2013. CVN 79 is to be of nearly identical design to CVN 78.

The shipbuilder plans to employ a new, more efficient build strategy, but remaining technical and design risks with the lead ship could interfere with the Navy’s ability to achieve its desired cost savings for CVN 79. These uncertainties also affect the soundness of the Navy’s current CVN 79 cost estimate, which is optimistic.

These factors, when coupled with the existing sole source environment for aircraft carrier construction, may compromise the government’s negotiating position for CVN 79.

Click here for the full report (70 PDF pages) on the GAO website.

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