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Napisano: 21 Jan 2015 12:11
gold_digger ::Cigi ::Gold diger, ovo je tema o avionu.
Rece covek koji svaki dan objavi politicke rasprave. 
Što je je.. 
Evo jedne, što je sigurno u vezi toga.
F-35 Program Massages Flight Test Results
 http://www.defense-aerospace.com/articles-view/fea.....82%29.html
Citat:Recent improvements in F-35 reliability figures are due to changes in the way failures are counted and processed, but do not reflect any actual improvement, according to the latest report by the Pentagon’s Director Operational Test & Evaluation.
Citat:“As of September 2014, an improved horizontal tail actuator component had been introduced and installed on roughly 30 aircraft out of a fleet of nearly 100. Failures of the older component were not being counted in the metrics at all anymore, but flight hours from all 100 aircraft were counted.”
This calculation, notes the report, “could result in the reported reliability of that component being increased by up to a factor of three compared to reliability if all of the horizontal tail actuator failures were counted.”
Dopuna: 21 Jan 2015 16:00
Pratt & Whitney Statement on DOT&E Report
http://www.defense-aerospace.com/article-view/rele.....ngine.html
Citat:Similar to previous reports, the latest DOT&E F-35 report points to the tremendous amount of positive progress made by the F-35 program last year. The F135 engine specifically has averaged 98 percent mission availability, achieved more than 26,000 ground test hours, more than 21,500 flight hours, and powered more than 750 vertical landings.
The F135 proved its durability through very rigorous live fire testing, and the engine also performed exceptionally well during carrier trials from the USS Nimitz in November, powering the F-35C without a single instance of unscheduled engine maintenance.
Citat:(EDITOR’S NOTE: Contrasting with Pratt’s highly (excessively?) optimistic statement above, here is what the latest (FY2014) OT&E report actually says about the F135 engine (emphasis in bold typeface is ours):
-- Nowhere does the report state that “The F135 engine specifically has averaged 98 percent mission availability,” as claimed above by Pratt, nor does it mention “750 vertical landings.”
-- What the report actually says is that “Aircraft availability was flat over most of the past year, maintaining an average for the fleet of 37 percent for the 12-month rolling period.” This is exactly the same as reported a year ago, in the 2013 report. In other words, there is no improvement whatsoever in availability.
-- “Inspections of the engines on all variants led to discoveries on nine production and test aircraft requiring engine replacement.” (page 45) In other words, one in ten F135 engines has the same defect, and must be replaced.
-- “Availability of the operational test aircraft will continue to be [adversely] affected in CY15 and CY16 by the depot time required for [engine] modifications.” (Page 40)
“It is [still] not clear what occurred differently than expected in the air vehicle and/or engine that caused the excessive rubbing” which led to the June 23 catastrophic failure. (page 45)
-- “Additional details and analyses of the uncontained F135 fan blade release and subsequent fuel fire in an F-35A at Eglin AFB in June are needed to support and update the existing engine vulnerability assessment.” (page 42)
-- “The uncontained F135 fan blade release and subsequent fuel fire in an F-35A at Eglin AFB in June provides an additional data point that needs to be reviewed and analyzed to support the F-35 vulnerability assessment.” (page 57)
-- Operating restrictions stemming from the engine failure remain in force, and “must be relieved for the test aircraft such that all blocked test points are made available.” (page 40)
Na kraju članka je link do ovih stranica.
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