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F-35 vertical landing  (Source: DefenseNews)
Jets have significant issues with engines and other componnets

The F-35 Lightning II program can't win for losing. The long running issues with the aircraft have been well documented and have led to delays in the program. Many of the flight issues with the F-35 have centered on the more mechanically complex F-35B STOVL version of the fighter aircraft. A new report has surfaced that highlights some previously unknown problems with the F-35 program.

According to a report compiled by the Pentagon Director of Operational Test and Evaluation, the F-35 aircraft all suffer from various problems with handling, avionics, afterburner, and the helmet-mounted display systems. The F-35A and F-35B variants are specifically said to suffer from "transonic wing roll-off, [and] greater than expected sideslip during medium angle-of-attack testing" according to the report. The report also notes that many of the components being used in the aircraft are not as reliable as expected.

The F-35B has had various issues with subcomponents in the past, specifically the ones that allow the door behind the cockpit to open so the aircraft can get the air needed for vertical landing. The F-35B has made successful vertical landings recently.

One key problem that is common on the aircraft is an issue described as afterburner "screech" reports Defense News. Apparently, the F-135 engine provided by Pratt and Whitney has a problem where airflow causes severe vibrations that prevent the engine from reaching maximum power.

The helmet-mounted display system in the aircraft is also having issues, but the report doesn't delve into this exact problems. The F-35 has no traditional heads-up display like other aircraft flying today - all pilot data is on a display inside the helmet.

Lockheed martin spokesman John Kent said, "The F-35 air system advances Helmet Mounted Display technology to capabilities not flying today on any other tactical platform. With this advancement in technology come challenges that the program is actively managing. The challenges are being worked with the supplier." Kent goes on to say, "While there are no current plans to change suppliers, options are being considered in parallel that mitigate the most stressing issues. Flight testing is proceeding with the HMD installed and used with no safety of flight concerns."

The report also mentions an issue with the aircraft’s onboard inert Gas Generation System that helps prevent oxygen from building up inside the fuel tanks where it becomes a fire hazard. The report recommends a redesign for the system. 

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Sorry but...
By BitJunkie on 1/19/2011 4:52:53 PM , Rating: 1
This must be the worst blog post I've seen on Dailytech to date:

"Jets have significant issues with engines and other componnets"

Jets don't have issues, they have problems with mechanical reliability, design faults and out of specification performance. Components suffer from higher than expected mean time between failure. People in therapy have "issues", military hardware designed to maintain the freedom of the greatest country in the world does not.

Please go and find your thesaurus or my 10 year old daughter might be able to take over writing articles and opinion pieces for this website.

Carry on.

RE: Sorry but...
By AssBall on 1/19/2011 5:08:59 PM , Rating: 1 ( issue ):

n. problem. In colloquial use, issue has virtually replaced the word problem.

Don't quit your day job, unless you are an English professor.

RE: Sorry but...
By BitJunkie on 1/20/2011 12:52:54 AM , Rating: 3
My Dictionary is better than yours: in this case the Oxford Online.


* an important topic or problem for debate or discussion:
the issue of racism
raising awareness of environmental issues

* (issues) personal problems or difficulties:
emotions and intimacy issues that were largely dealt with through alcohol
I like him, though I have some issues with the guy

* (issues) problems or difficulties, especially with a service or facility:
a small number of users are experiencing connectivity issues

Anyway, you made my point for me by stating that it has, in colloquial use, replaced the word problem. It's a cheap overused word for those with a poor vocabulary and no imagination. Or those with the learning age of a 10 year old.

None of the defnitions above are relevant for an engineering design. They are very relevant for situations where personal preference, opinion or personal inconvenience are concerned.

I have an issue with the use of the word issue so frequently in the cited article. It's out of context and used in the most inappropriate way. It makes the author appear lazy, poorly educated and lacking in creativity. Do you have an issue with that?

RE: Sorry but...
By Josett on 1/19/2011 10:36:46 PM , Rating: 1
People in therapy have "issues", military hardware designed to maintain the freedom of the greatest country in the world does not.

And, that'd be a paralogism.

RE: Sorry but...
By BitJunkie on 1/20/2011 1:22:15 AM , Rating: 3
No, it would be irony.

"Well, we didn't have anyone in line that got shot waiting for our system." -- Nintendo of America Vice President Perrin Kaplan
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