Archief van de maart, 2008

Mrt 12 2008

Nieuwe Amerikaanse rekenkamer rapporten over JSF

Gepubliceerd door onder Aanschaf JSF, Ontwikkeling JSF

Op 11 maart 2008 zijn twee nieuw Amerikaanse Rekenkamer rapporten verschenen over de JSF. De conclusies zijn helaas niet zo gunstig: meer tijd en geld nodig voor ontwikkelfase; risico verdere vertragingen; verdubbeling kosten per vlieguur; en kostenschattingen niet inzichtelijk.
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Mrt 10 2008

Franse en Duitse software voor JSF productieproces

Gepubliceerd door onder Ontwikkeling JSF

Deze week verscheen in het Amerikaanse blad Manufacturing Business Technology een interessant artikel over de ERP/productie software in gebruik bij de JSF/F-35 productie. Lees verder »

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Mrt 08 2008

F-35 engine problems reported by Pentagon Acquisition Chief

Gepubliceerd door onder Global F35 News

Testimony of John J. Young, Under Secretary of Defense (Acquisition, Technology & Logistics) before the United States House Committee on Armed Services Air and Land Forces Subcommittee and Seapower and Expeditionary Forces Subcommittee about the development problems relating the F-135 fighter jet engine.

Testimony of Young

The Pratt and Whitney (P&W) F135 engine development program is aligned with the F-35 air vehicle development. The F135 is the primary engine for the program and began SDD in 2002. Ten F135 ground test engines and three CTOL and three STOVL flight test engines are in developmental testing and have accumulated over 9,000 test hours.

Several engine failures, 2007 and 2008

In August 2007, an F135 engine experienced a hardware failure during test stand operations with the STOVL lift fan engaged. Root cause analysis determined that high cycle fatigue caused the 3rd stage Low Pressure Turbine (LPT) blade failure. Test engines were instrumented to assist in verifying the analysis and assist in determining solutions. On February 4, 2008, a similar failure occurred
during test stand operations with the STOVL lift fan engaged. Instrumentation and data supported the analysis of high cycle fatigue in the 3rd stage. Additionally, the occurrence confirmed that it was a STOVL powered lift problem experience at high thrust settings and almost exactly the same vibration regime. The engine was cleared for conventional operations and AA-1 flew a few days later. The exact root cause appears likely to be a combination of factors related to the design of the blades, the material composition of the blade dampers, and the symmetry of the 3rd stage fixed vanes. New blade, blade dampers, and vane hardware are being retrofitted on the test engines and they will begin testing with additional instrumentation in April.

The engine failure will delay BF-1 first flight by 30-60 days. The Original plan for BF-1 was to fly in the “conventional” mode for several months and gradually phase in STOVL operations and that will not change. Specific STOVL operations will be delayed approximately 3-4 months and are planned to begin on BF-1 in the December/January timeframe. The schedule delays will not adversely affect the program. The F-135 hardware failure is not unique to a developmental engine program. Many programs experience early test problems that force them to alter the design. That is exactly what happened in this case. The F135 program is progressing well and I expect that to continue.

F136 Engine Development and Alternate Engine Strategy

The General Electric/Rolls Royce (GE/RR) F136 engine lags the F135 program by approximately 3-4 years. There are two pre-SDD F136 engines in testing that have accumulated approximately 600 hours. The first F136 SDD engine will begin testing in December 2008. The Department’s Cost Analysis Improvement Group (CAIG) completed an analysis of the F-35 propulsion system as directed in section 211 of the John Warner National Defense Authorization Act for Fiscal Year 2007. The CAIG determined that there were no life cycle costs benefits due to competition, in fact, a competitive program would likely cost slightly more. The CAIG also estimated that procurement savings in excess of 21% would be required to recoup the up front investment in a competitive engine program, a savings they deemed unlikely. The CAIG did identify non-quantified benefits to competition. The Department has continually acknowledged the many intangible benefits of competition. The Department did not direct the CAIG to update their analysis. There have been no significant changes to the program that would have resulted in any changes to their findings.
The Department will comply with section 213 of the John Warner National Defense Authorization Act for FY 2008. We will ensure that in each fiscal year where funds are appropriated there is obligation and expenditure of sufficient amounts for continued development and procurement of two options for the JSF propulsion system. However, the Department continues to believe that the
investment required to develop an alternate engine is more appropriately proposed for other Department priorities. In the 2006 Quadrennial Defense Review, the Department laid out a future strategic vision to meet the new and broader array of threats to the Nation. It requires the Department to carefully consider capabilities versus cost and, if necessary, divert resources from lower priority programs in order to be able to afford the new capabilities required.

Engine technology development, design and manufacturing process improvements continue to provide increased reliability, maintainability and safety. The F/A-18E/F and F-22A are recent examples of aircraft programs that successfully operate with a single engine provider. Considering Department priorities, budget realities, and improved engine
technology, the Department concluded that the risk associated with a single engine source is acceptable and, while it would be nice to have a second engine, it is not necessary and not affordable

Source: US House of Representatives; 11-Mar-2008


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Mrt 07 2008

Deense TERMA levert F-35 Dart op tijd

Gepubliceerd door onder Ontwikkeling JSF

De Deense fabriek Terma leverde, op tijd, de eerste van zeven Flight Test Instrumentation Pods aan Lockheed Martin ten behoeve van het testvlliegprogramma. Terma ontving hiervoor in juni 2006 een opdracht van US$ 7,5 miljoen in het kader van de ontwikkelfase (SDD fase) van de JSF. Terma maakt ook andere apparatuur voor het testprogramma. Lees verder »

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Mrt 06 2008

US NAVY wil Super Hornets voor opvang JSF vertraging

Gepubliceerd door onder Ontwikkeling JSF

De Amerikaanse marine (US Navy) overweegt de aankoop van 69 stuks Boeing F/A-18E/F Super Hornet jagers om het gat te vullen dat gaat ontstaan rond 2015-2018 door het afstoten van de huidige F/A 18 Hornet (oude type). Het gat ontstaat door twee oorzaken. Hoofdoorzaak: de vertraging in het JSF programma, dat inmiddels qua Initial Operation Capability datum voor de US Navy zo’n twee jaar achter ligt op schema, Lees verder »

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Mrt 05 2008

Noors gevecht om F16 opvolging

Gepubliceerd door onder Aanschaf JSF, Concurrentie

Sommigen denken dat de JSF discussie iets typisch Nederlands is. Niet is minder waar, want in diverse andere landen woedt in alle hevigheid dezelfde discussie. Zo wordt op dit moment in Noorwegen de serie uitgezonden “”Bak lukkede dører” (= “Achter gesloten deuren”) door NRK over het miljardengevecht om de F16 opvolger. Lees verder »

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Mrt 04 2008

Pratt & Whitney F135 Motor overschrijdt 9000 Grond Test Uren

Gepubliceerd door onder Ontwikkeling JSF

EAST HARTFORD, USA /PRNewswire/ — De Pratt & Whitney F135 motor heeft de 9000 grond testuren voor de system development en demonstration (SDD) fase overschreden.
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