Forum: F-22A Raptor

checksixx wrote:

"However telemetry transmitted back to the ground station monitoring the test gave away the problem as there was a momentary power loss recorded in the signal. This information was only discovered in the post analysis of the flight data."

--

It may have been that the "power loss" quoted was an electrical power loss and not an engine power loss, in which case the pilot probably would not have noticed it at all. I know nothing about F-22s so I'm hardly an expert on their engines, so I could well be wrong here.

I do know that with FADECs these days you seemingly don't need variable-geometry intakes as much as you did back in the '50s, '60s and '70s. I'd be willing to bet anyone a beer that the Raptor has fixed intakes. I've never seen one, nor have I asked any of my former coworkers (the first ANG Raptor keepers in captivity) about them, but I'd bet they're fixed.

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checksixx wrote:

Either way most testing does not occure at "low altitude" and certainly not below the set hard deck for the tests.

No, no, no. Below the hard deck does not count.

BUHHHLLLSCCCHHHIIIT!

checksixx wrote:

BUHHHLLLSCCCHHHIIIT!

Has anyone found another source for the article? Seems weird that there aren't any news agencies carrying this story... Shrug

Right now i would agree with Check6....

That_Engine_Guy wrote:

checksixx wrote:

BUHHHLLLSCCCHHHIIIT!

Has anyone found another source for the article? Seems weird that there aren't any news agencies carrying this story... Shrug

Right now i would agree with Check6....

I don't know, I just don't really see this as a news story - unless there's a whole lot more story here somewhere. Is an 'almost potential crash' even an incident, if the pilot, as the release indicated, never realized that there was a problem?

How often do other aircraft experience flame-outs that relight so quickly that no one notices that they happen - who knows, it could be every other flight, if no one is looking.

Mike

I'm certainly leanin' in Check's direction also. Even tho it was a test jet, the Raptor is not the type of jet to be blase about when an in-flight "event" happens. If it were a serious enough of a drop-out that some were thinkin' the jet was about to be lost, why didn't they abort the flight and RTB?

I'm startin' to think this thing may have been embellished just to get it printed. Mad

LinkF16SimDude wrote:

...why didn't they abort the flight and RTB?

I'm startin' to think this thing may have been embellished just to get it printed. Mad

I agree; even a compressor stall is enough for an IFE and rolling fire trucks. This sort of thing doesn't get by the media that often when it applies to high-profile (and high $$) programs like the Raptor's...

Esp during an election year... Rolling Eyes

DUAL Flame-outs? No IFE? Not even a tag-line from some sort of press? It's been over 3 days now and not a peep...

WTF

over?

Anyone remember when the Viper was such a dangerous fighter the program should be stopped and the contracts canceled!? Rolling Eyes

That_Engine_Guy wrote:

LinkF16SimDude wrote:

...why didn't they abort the flight and RTB?

I'm startin' to think this thing may have been embellished just to get it printed. Mad

I agree; even a compressor stall is enough for an IFE and rolling fire trucks. This sort of thing doesn't get by the media that often when it applies to high-profile (and high $$) programs like the Raptor's...

Esp during an election year... Rolling Eyes

DUAL Flame-outs? No IFE? Not even a tag-line from some sort of press? It's been over 3 days now and not a peep...

Anyone remember when the Viper was such a dangerous fighter the program should be stopped and the contracts canceled!?

I agree as well, the original 'story' comes from a story told at a convention the article cited in the first post in the thread states:

Quote:

"The dual-engine flameout was not discovered until flight engineers reviewed performance data from the flight."

Simply put, if the pilot never knew that there was a problem (as the article states), and the Test Control Staff only knew that there was a loss of telemetry - the the aircraft did not almost potentially crash - and without the embellishment, the story itself isn't really a story at all.

Mike

Flight International 's article from setp.org , I think they use a wrong title .

F-22 SMALL DIAMETER BOMB INTEGRATION TESTING; THERE'S HOPE FOR THE LITTLE GUY...
Maj Jack Fischer, USAF (M)
Capt Harris Hall, USAF
William Kuhlemeier, Lockheed Martin
Kimberly Tucker, Lockheed Martin
2Lt Brad Strong, USAF

The Small Diameter Bomb (SDB) weapon system is the flagship capability leading the F-22 Increment 3.1 upgrade effort. This weapon represents a revolutionary combination of numerous new technologies that deliver a low cost, highly accurate, extremely flexible and maintainable stand-off weapon. The SDB was initially integrated on the F-15E Strike Eagle and is already playing a prominent role operationally. The improved capabilities SDB offers are numerous and include increased kills per pass, minimized collateral damage, reduced logistics footprint, advanced flexible fuzing, and significant and affordable standoff potential. Providing the SDB stealthy supersonic delivery via the Raptor will create an unprecedented degree of air-to-ground capability to the warfighter.

Unfortunately, the transition to the F-22 from F-15E is not as straightforward as it may appear. Many testing challenges, some of which have yet to be overcome, have arisen in the physical integration, instrumentation (specifically in loads measurements), range availability/clearance, and limited lifetimes of both the flight termination system (FTS) battery and weapon battery . The numerous configurations requiring testing and the extensive increase in the weapon’s employment envelope have also added to the size and scope of the program atypical of previous weapons testing on the F-22.

This paper describes the F-22 SDB integration test approach and highlights the progress made thus far in its execution. The lessons learned for both ground test and flight test are also presented. Test planning for future testing is discussed with specific attention on the separation and live fire test planning difficulties with range footprint and safety control.

http://www.setp.org/HTML/Symposia/LosAn ... ischer.htm

Forum: F-22A Raptor

Raptor dual flameout incident...