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F-15 Breaks Up in Midair

http://www.nytimes.com/2007/11/13/opinion/13tues1.html?ref=opinion&pagewanted=print


November 13, 2007
Editorial
Structural Failures
The recent crash of an Air Force F-15 fighter jet — and the grounding of the entire 700-plane fleet as a precautionary measure — is the latest reminder of the tough military budget choices this country will face for the foreseeable future. Even if American troops were withdrawn from Iraq tomorrow, billions of dollars would still be needed to replenish military equipment, swap aging weapons systems for new ones and rebuild and expand ground forces strained to the breaking point by this misguided war.

After years of signing blank checks to the Pentagon, the next president and Congress will also have to insist on a serious review of what is truly needed to protect the country from a new generation of threats — and not just line the pockets of contractors and their lobbyists.

Although the crash in Missouri on Nov. 2 is still being studied, initial reports suggest that the plane suffered structural failure and disintegrated in the air. That F-15 was built in 1980, but some of the planes in the fleet are more than 30 years old. The problem is that the Air Force’s chosen replacement, the F-22 stealth fighter, is both extremely expensive and already out of date — designed originally for air-to-air combat against Soviet style MIG fighters during the cold war.

American taxpayers have a right to insist that the Pentagon make sounder choices in the future.

The most immediate problem is digging out from Iraq and Afghanistan. The Army has borne much of the burden, and it will need a lot of help to replace war-worn equipment and replenish a strained and war-weary force.

As it has struggled to meet recruiting targets, the Army has had to compromise personnel standards. Last year, 15 percent of recruits needed waivers because they didn’t meet requirements on education, medical and lack of a criminal record. That number has risen to 18 percent so far this year. Meanwhile, a large percentage of West Point graduates — the elite corps from which Army officers are drawn — are leaving active duty as soon as their required time is up.

Exploding health care expenses for returning veterans and what many servicemen and officers see as a crisis of confidence in military leadership add to the challenges going forward. The Navy and Marine Corps also have their own replacement and modernization problems. The Army and the Marines, having carried these wars, deserve to have their needs addressed first.

The United States has spent a staggering $800 billion just on war fighting since Sept. 11, 2001. President Bush has no plan for rebuilding the force, beyond asking for ever more cash.

The presidential candidates will have to do a better job. They can start by explaining how they plan to withdraw American troops from Iraq and then how they plan to rebuild a military capable of defending this country from a new generation of threats.

Copyright 2007 The New York Times Company

 
 
Baden  Guy said:
... and already out of date — designed originally for air-to-air combat against Soviet style MIG fighters during the cold war.

There's always one line in every piece that just makes you chuckle a little bit.... :D

Bandit
 
That last line about F-22's being already outdated is just insane........

Although they can't use Super Hornets from CVN's, why not make a land-based version of the aircraft somewhat like what we did with the CF-18??? Even though the new Super Hornets are about $60million or so a jet, it's still a lot cheaper than an F-22 and definitely fills the job of air-to-ground as well as air-to-air. It's a proven platform so why not go with it for the interim? It would seem crazy to invest billions into replacing your air force with a jet that's a stop gap until the F-35, but it's a lot better than nothing and it's already in production... I would think if they order a large number of aircraft like that the unit price would go down as well.

Seems like a good idea no?
 
F-15E Strike Eagles to fly again in Iraq, Afghanistan
Article Link

WASHINGTON (CNN) -- The Air Force is returning F-15E Strike Eagle jets to service over Iraq and Afghanistan after grounding other F-15s, the Air Force said Wednesday.

The Air Force grounded models of its F-15 fleet after the crash of an older model F-15C this month.

The F-15s were grounded after a crash earlier this month in Missouri of an older model that disintegrated in flight.

Each F-15E must pass an inspection of critical parts on the airframe before returning to flying missions, Air Force officials said.

All U.S. Air Force 224 E-model aircraft will undergo a one-time inspection of hydraulic system lines, the Air Force statement said.

The longerons -- molded, metal strips of the aircraft fuselage that run from front to rear -- will also be inspected, according to the Air Force.

The straps and skin panels in and around the environmental control system bay will also be examined, officials said.

The Air Force would not say whether the parts being inspected were part of the problem on the aircraft that crashed.
More on link
 
Another update on some F15s' being allowed to fly again.

http://www.military.com/features/0,15240,156302,00.html?wh=wh

Some F-15s Allowed Back in the Air
Stars and Stripes | Bryan Mitchell | November 15, 2007
RAF LAKENHEATH, England -- The Air Force rescinded a grounding order on some of its F-15s Wednesday, sending a fighter jet squadron in Afghanistan back on combat sorties and squadrons in the United Kingdom back onto their training regimen.

The F-15Es can return to flight after a one-time 13-hour inspection, according to Air Force spokeswoman Jennifer Bentley. All other models remain grounded.

"Some of our planes are flying here," said 455th Air Expeditionary Wing spokesman Capt. Michael Meridith from Bagram Air Base, Afghanistan.

The latest grounding was ordered last week after the Nov. 2 crash of an F-15C from the Missouri Air National Guard. The crash was the second involving a Missouri Air National Guard F-15 this year.

The pilot was engaged in a dog fighting exercise at speeds of up to 500 mph when the accident occurred. He ejected safely and suffered minor injuries.

The order grounded the aging fleet of more than 700 F-15s across the United States and at Lakenheath, where the 48th Fighter Wing is based. The wing has the only contingent of F-15s in U.S. Air Forces Europe.

It's unclear if the Air Force determined what caused the crash, but officials have acknowledged the plane suffered structural problems and broke apart in flight.

"They can't give us anything partial from the investigation," Bentley said.

RAF Lakenheath is home to three F-15 squadrons, which includes approximately 83 F-15s that fly an average of 60 sorties a day.

During the grounding, pilots and weapons systems officers at the 48th Fighter Wing focused on studying and preparing for the ongoing NATO Operations evaluation while the maintenance crews attempted to work ahead on scheduled overhauls, RAF Lakenheath officials said last week.

The first F-15 rolled off the McDonnell Douglas production line and launched into the skies in 1972. Upgrades and modifications have significantly altered the aircraft.

The F-15 is one of the primary aircraft used by the Air Force in Afghanistan to provide close-air support to coalition troops serving across the Texas-sized nation.

The Lakenheath-based 492nd Fighter Squadron recently returned from a four-month tour of Bagram Air Base, in which it engaged in nearly daily combat sorties and employed roughly 1,000 munitions.

Saudi Arabia, Japan and Israel also maintain individual fleets of F-15s.

The move to lift the order ended the longest grounding for the F-15 since 1983, when a defective component found on a fighter jet at Langley Air Force Base, Va., led to a similar long-term grounding, according to the Air Force.

The Air Force bought its last F-15 in 2004 and has long-term plans to eventually replace the fighter jet with the F-22, which has yet to be deployed on combat missions.
 
R215 Pte Joe said:
That last line about F-22's being already outdated is just insane........

Although they can't use Super Hornets from CVN's, why not make a land-based version of the aircraft somewhat like what we did with the CF-18??? Even though the new Super Hornets are about $60million or so a jet, it's still a lot cheaper than an F-22 and definitely fills the job of air-to-ground as well as air-to-air. It's a proven platform so why not go with it for the interim? It would seem crazy to invest billions into replacing your air force with a jet that's a stop gap until the F-35, but it's a lot better than nothing and it's already in production... I would think if they order a large number of aircraft like that the unit price would go down as well.

Seems like a good idea no?

The F-22's original mission and putative reason for being no longer exists, which is what the writer was trying to convey. There are some issues with the F-22 being used as a strike platform, although there is a theoretical option for an "FB-22", should you have a few billion in your back pocket.

I don't see the "Super Hornet" as anything more than the logical evolutionary end point for the Hornet series of planes. Due to some bad decisions dating back as far as the Reagan administration, the US Navy has more or less run out of airframes due to age and use, and needs something to fill the gaps while the F-35 series comes into production.

While the planes from the "Fighter Mafia" were and are outstanding examples of the designer's art, they are still products of the 1970's, and even if you were to build entirely new F-15's, F-16's or F-18's today, you would not be able to take advantage of many modern material and production methodologies (the entire airframe would have to be redesigned), or advances in various systems (none of these planes were designed around vectored thrust, for example), or even "wants" like supercruise or "Stealth".

The stupendous costs of the F-22 and F-35 are a reflection of a lot of R&D, the inclusion of an incredible wish list of features and the prolonged gestation period (the F-22's genesis was the 1980 era "Advanced Tactical Fighter" program). If the "Fighter Mafia" were still around, I suspect their entry would be a stripped down "hot rod" resembling the F-16XL
 
...If the "Fighter Mafia" were still around...
  Hunh?  ???

Not tracking why that's a phrase written in the conditional tense...


G2G
 
The "Fighter Mafia" was a small team led and influenced by the late Col John Boyd. They were influenced by Col Boyd's work on air combat manouevres and his theoretical work on "Energy-Maneuverability" as well as concerned by the rapidly escalating growth in aircraft size, weight and cost. (The first two factors weigh heavily in E-M theory).

The F-15 was a result of Col Boyd's "official" work with the Air Force, although the USAF still insisted on many features that added to the size and expense of the airplane. Some, like the large radar array, are clearly advantageous, while others, in Boyd's view, were not. Boyd and the "Fighter Mafia" took E-M theory as far as it would go with early 1970 era technology and came up with a design envelope which General Dynamics turned into the XF-16, while Northrup came up with the XF-17.

A modern day counterpart to the  F-16 might superficially resemble it (look at the LAVI, which was a sort of 1980's interpretation of the design), but with modern materials to make it much lighter and modern aerodynamics to make it more efficient it would be one heck of an airplane.

               
 
Arthur, tracking now...."F"ighter "M"afia, as opposed to "fighter mafia".  I would say the lower-case version still exists almost everywhere fighter pilots still live and breath.

I'm not sure if I'd say Col. John Boyd was ever part of the "Fighter Mafia"...he had pretty much a hate-hate relationship with the USAF and the USAF didn't really like his style, notwithstanding the absolutely irrefutable validity and value of his E-M work.  The USAF also betrayed him on the F-15...using him for his knowledge on the E-M bit, yet screwing him by perverting his original concept to the point where the Eagle was significantly larger than he ever thought responsible.

The fact that the USAF sent a lone, materiel-background BG to represent the USAF at his funeral in Arlington, while hundreds of Marines showed up to pay their last respects to a pilot they had "adopted in spirit" from another service, speaks volumes of the USAF, and the "Fighter Mafia's" disdain for Col. Boyd.

Those looking for a good read should try Boyd: The Fighter Pilot Who Changed the Art of War by Robert Coram


G2G
 
All models of the F-15,except the E model, are grounded once again.

upper longerons near the canopy of the aircraft that appear to have cracked and failed

http://www.airforcetimes.com/news/2007/11/airforce_f15_grounded_again_071128w/

Air Force grounds F-15s — again

By Bruce Rolfsen - Staff writer
Posted : Wednesday Nov 28, 2007 17:48:21 EST

For the second time in less than a month, F-15 Eagles are grounded.

Air Combat Command announced today that A, B, C and D-model versions of the fighter would “stand down” for an indefinite period of time.

F-15E Strike Eagles, a larger and newer version of the fighters, are not grounded and continue to fly, ACC said.

Like the ordered grounding on Nov. 3, this decision stems from the Nov. 2 crash of a 27-year-old Missouri Air National Guard F-15C. That fighter broke apart between the cockpit and main fuselage as it flew an air-to-air combat training sortie.

Wednesday’s announcement comes 12 days after F-15 A-D units were told their jets could return to flight as each fighter passed a 15-hour-long inspection. As of today, about 90 percent of the F-15As, Bs, Cs and Ds had passed the inspection.

Air Combat Command spokesmen said the new concern involves cracks in metal supports called longerons near the cockpits. The longerons are metal rails that hold the fuselage of the aircraft together.

The latest decision to ground the jets was based on a metallurgical analysis of the jet that crashed Nov. 2. The investigation drew attention to the F-15’s upper longerons near the canopy of the aircraft that appear to have cracked and failed, ACC said.

Those longerons were covered in general by previous inspections but technical experts with the air logistics center assisting in the accident investigation board have recommended a specific inspection of the suspect area.

The F-15 program office at Warner Robins Air Logistics Center, Ga., is developing new inspection criteria for the jets. Originally manufactured by McDonnell Douglas, the A-models, the oldest of the service’s F-15s, have been flying since 1975 and were developed to replace the F-4 Phantom and take on the MiG-25. C-models came on line in the late 1970s. The B-model and D-model Eagles are two-seat trainer versions of the A and C planes.

Boeing, which purchased McDonnell Douglas a decade ago, delivered the last F-15 to the Air Force in 2004 and is now working to upgrade some of the older planes. The most recent model, the unaffected F-15E Strike Eagle, entered service in 1989 and is currently in use in Afghanistan.

Variants of the F-15 are also in use by the air forces of Israel, South Korea, Saudi Arabia, Singapore and Japan.
 
First - details of the investigation have been released, as well as a computer animation of the crash and a HUD Display/Animation of the crash can be found linked below.

Executive Summary and Computer Animations of Crash

Second - this came through the wire yesterday.

PRESS RELEASE -- Secretary of the Air Force, Office of Public Affairs

Release No. 020108
January 8,2008

AIR COMBAT COMMAND CLEARS SELECTED F-15s FOR FLIGHT

LANGLEY AIR FORCE BASE, Va. - Air Combat Command today cleared a portion of its F-15 A-D model aircraft for flying status and recommended a limited return to flight for Air Force units worldwide following engineering risk assessments and data received from multiple fleet-wide inspections.

The return to fly order and recommendation applies only to those F-15 aircraft, about 60 percent of the total Air Force F-15 A-D fleet, that have cleared all inspections and have met longeron manufacturing specifications.

The order and recommendation follows more than two months of stand-down actions after an Air National Guard F-15C aircraft experienced catastrophic structural failure and broke apart in flight during a basic fighter maneuver training sortie in Missouri on Nov. 2.

"The priority in resuming operations for a portion of the F-15 fleet is the defense of our nation -- America deserves nothing less," said General John D.W. Corley, Air Combat Command commander. "Aircraft inspection results and counsel from both military and industry experts have made me confident in the safety of a portion of the fleet. As a result, I have cleared those F-15s to return to fly."

Today's decision follows detailed information briefed on Friday to Air Combat Command from the Air Force's F-15 Systems Program Manager, senior engineers from Boeing and the Warner Robins Air Logistics Center, as well as a briefing received today from the Accident Investigation Board president.

The information included an analysis of the health of the Air Force's F-15 fleet from findings from the Nov. 2 mishap investigation, maintenance inspections and actions completed and taken to date as well as historical science and engineering trend data from F-15 fleet management.

Inspections are more than 90 percent complete. Remaining inspections have primarily focused on the forward longerons. The longerons are a critical support structure.

TCTO inspections have discovered nine other aircraft with longeron fatigue-cracks. Additionally, approximately 40 percent of inspected aircraft have at least one longeron that does not meet blueprint specifications.

Deviations in these longerons will be analyzed at the WR-ALC. The analysis is expected to take approximately four weeks to complete. Once the analysis is complete, ACC will be able to better determine which aircraft will need further inspection, or repair, before returning them to flight.

A media availability will be held at the Pentagon on Thursday, Jan. 10, to address the conclusion of the Nov. 2 accident investigation and findings to date. Air Force operations, maintenance, and engineering experts will be available to answer questions.

For more information on today's announcement, contact Air Combat Command public affairs at (757) 764-5007. For more information about Thursday's media availability, contact the Air Force Press Desk at (703) 695-0640.
 
Yep the longerons were not built according to specs.The USAF ought to take the manufacturer to court.
Might be good news though for the USAF's effort to get more F-22's.

51541_110193239.jpg
 
tomahawk6 said:
Yep the longerons were not built accorfing to specs.

Source for that ?

I dont see that being said in the above article
 
Under the Executive Summary portion of my post, above the article.

Bandit
 
Inspections are more than 90 percent complete. Remaining inspections have primarily focused on the forward longerons. The longerons are a critical support structure.

TCTO inspections have discovered nine other aircraft with longeron fatigue-cracks. Additionally, approximately 40 percent of inspected aircraft have at least one longeron that does not meet blueprint specifications. Deviations in these longerons will be analyzed at the WR-ALC. The analysis is expected to take approximately four weeks to complete. Once the analysis is complete, ACC will be able to better determine which aircraft will need further inspection, or repair, before returning them to flight.
 
Here's more on the report. :)

http://www.stripes.com/article.asp?section=104&article=51541
 
Animation without having to dl.
http://www.militarytimes.com/multimedia/video/f15cockpit1/
 
An Air Guard F-15 crashed today. Pilot was rescued.

4_61_f15_medium.jpg

http://www.foxnews.com/story/0,2933,327786,00.html

HONOLULU  —  A fighter jet among a troubled fleet of F-15s that recently returned to the skies plunged into the ocean Friday, but the pilot ejected in time and was rescued shortly afterward.

A Coast Guard helicopter plucked the Hawaii National Guard pilot from the ocean. He was taken to a hospital and was listed in good condition.

The pilot, whose identity was not released, had extensive flight experience, said Maj. Gen. Robert G.F. Lee, the Hawaii National Guard commander.

"Our first concern was whether the pilot was OK," Lee told KHON-TV. "I got the chance to visit with him in the hospital. He's terrific."

The pilot said he could not control the plane and started to lose altitude before the crash, according to Lee. That's when he made the decision to eject and parachuted to the water 60 miles south of Honolulu.

The cause of the crash was being investigated. The plane had experienced no problems during a routine training exercise earlier in the day, Lee said.

The crash comes just a few weeks after the Hawaii Air National Guard, which uses the fighter jets to patrol island airspace, resumed flying the jet. The Guard returned 13 of its 20 planes to the air on Jan. 9. The remaining seven were still grounded and were undergoing inspections by engineers.

The Hawaii National Guard's F-15 jets, built between 1974 and 1978, were acquired in 1987 and had never before experienced a crash, Lee said.

The fleet's grounding came after a model broke in two during a training flight over Missouri, injuring the pilot. An investigation concluded that a defective aluminum beam in the frame cracked.

Another probe found that more than 150 of the military's F-15s also had the flawed beams
 
          Thankfully the pilot was alright  and hopefully they can find out what led to this crash .
 
Methinks that, with this bad "run" of incidents, politicians, MsM and the public will be clamoring for the permanent grounding of the F15... thereby adding pressure for the deployment of something like the new generation of fighters...
 
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