Thursday, October 2, 2014

How bad is Typhoon's problem...?

For those who might haven't heard about it yet, the german Bundeswehr has announced in public that a manufacture fault has been discovered in the rear fuselage of the Typhoon aircraft, in a part produced by BAE Systems, and that has a consequence, while solutions are sought and the full danger to safety is determined, they are not going to accept the 6 aircraft on delivery this year. Flying hours across the fleet will also be kept under control and possibly reduced as the safe, guaranteed flying life of the airframes has been cut precautionally from 3000 to 1500 hours.

The official Bundeswehr statement is available here. Its content has been reaffirmed by officers interviewed by the German press.
Defense News reports that the problem was first detected by the Royal Air Force, which launched the alarm and also cut flying hours to comply with a 1500 hours safe life, without announcing anything in public. Eurofighter has released a statement to the press that acknowledges the issue but basically says that all is fine and we should not worry:

Munich 1st October, 2014
‘Eurofighter GmbH is aware of and actively managing a recently discovered quality issue concerning one of the manufacturing processes used during the assembly of the Eurofighter Typhoon rear fuselage.

We would like to make clear that this issue does not affect flight safety, neither does it impact ongoing fleet flying or limit fleet operations.

Eurofighter GmbH is currently working together with NETMA and its Customers taking all measures necessary to ensure that this issue is successfully resolved without any flight life limitations to the operating air forces.‘

We can expect to hear more about this matter going ahead, for obvious reasons, even if so far there has not been a particular outcry on the press.
The manufacturing issue does rise the questions about what the effective danger is, and how the problem can be solved and, importantly, who is going to pay for the solution. If BAE screwed up, it would be very desirable that BAE pays, because the defence budget really has no need for a new funding crisis due to a big unplanned expenditure showing up like this.

The Bundeswehr laying the blame squarely on BAE tells us that the problem is localized in the STAGE 1 block of the rear fuselage, a part that BAE builds on behalf of Italy's Alenia, which builds the STAGE 2 and 3 and assembles them together. 

What caught my eye the most, however, is the astonishingly low certification of 3000 flying hours for the airframe. This value is far, far lower than anything we normally expect from a combat aircraft: Tornado has a 7000 hours life, extended to 7500 in some cases across the RAF fleet as of 5 July 2011 information released to Parliament by minister Peter Luff and quoted by DESIDER. An extension to 8000 hours was being tested to meet the OSD in 2021, and testing was possibly completed despite the advancing of OSD to March 2019; F-35 is due to be certified for 8000 hours. Some USMC Hornets are being life extended to a scary 10.000 hours to hold the line until the F-35B is available in numbers. And so along.

Typhoon is meant, by design, to eventually be certified for a 6000 hours life, with a growth potential to be eventually measured afterwards.
The certification of a safe flying hours life cycle comes after a long, complex stress simulation test conducted on land using airframes which never go into the air but are mechanically stressed to reproduce the effects of flying on the structure. Indicatively, three hours of simulated stress are representative of one hour of real flying, so that test airframes are stress-tested to the equivalent of three life cycles in order to certify one single actual-flying life.

The Typhoon is being stress-tested at the BAE Systems facilities in Brough, UK. 18.000 hours campaigns of tests were carried out earlier on prototype and developmental airframes, but for the final certification, due to the widespread differences between development examples and production aircraft (and the fact that the development airframe was stressed empty of internal systems), a new campaign had to be started. A twin-seater taken directly from the Warton production line is used for the campaign, known as Production Major Aircraft Fatigue Tests - PMAFT Twin Seat. In paralel, due to the extensive differences between twin seat and one seater, there is also a one seat airframe undergoing the same treatment under the Single Seater Fatigue Test (SIFT) campaign. The SIFT uses a dummy rear fuselage, but an actual centre and front fuselage for realism of the testing.
Some components, finally, are stressed separately, such as landing gear, foreplanes, flaps and slats.

In March 2012, the airframe had been stressed to the equivalent of 11.000 hours out of a planned 18.000 needed to certify the intended 6k hours life. 
The completition of 12.000 test hours, and the extension of certification from 3000 to 4000 hours as a consequence, were described as being "weeks away". 
The stress test campaign would last a full three years still, by what BAE says. Indicatively, the activity should conclude by March 2015, if what BAE said holds true and current. 

The Typhoon stress test installation in Brough

Do you see the problem? 

More than two years after that news release and not many months away from the expected completition date, german official sources are revealing that the certification for Typhoon is still at just 3000 hours, when, by now, we should be well above 4000 at the minimum, and indeed close to reaching the final 6000 hours point. 
If what the germans are saying is true, something certainly feels very wrong. Dates, plans and numbers being given most evidently do not match: if the sources i've posted are all telling the truth, i can only think that something has been imposing grave delays to the certification activity from soon after that BAE article was posted. Might it be that the test airframe has been developing grave cracks in the rear, and investigations on the root cause have, in quite a long time, revealed the quality issue now being denounced? Or is there some other problem we are not yet being informed about? I really can't say. But answers will have to be found quickly.

6000 hours are expected to be representative of a 25 years service life with an average of 240 hours flown per year. It is evident that a 3000 hours airframe life means the aircraft will be viable for a much shorter time, and a 1500 hours life is just ridiculous. The Germans, which fly considerably less than the RAF, assess that they will have 1500 hours old airframes by 2018. The RAF is going to hit that value much sooner: consider that the british Typhoon fleet celebrated the 100.000 cumulative flying hours earlier this year, which equates, over a fleet of some 100, to airframes 1000 hours old as of last year. Of course, airframes were not delivered all together and have not used in the same way, so some will actually be "older" in hours terms than many others. For some, the 1500 hours point might be very close indeed, if not already reached and passed. 

UPDATE: thanks to Topman for reminding me of the fact that, indeed, some RAF Typhoons (no idea how many) have indeed well passed the 1500 hours mark. The first of them underwent major maintenance in 2012 after completing 1600 hours

When the Typhoon fleet celebrated the worldwide 250.000 flying hours milestone back in July this year, it became even more evident how much the RAF weights in the Typhoon world: more than 100.000 hours versus some 20.000 for Saudi Arabia and 130.000 for the combined Germany, Italy, Spain and Austria. This makes evident why any delay in clearing the doubts on the airframe life will hit the RAF hardest. 

I look forwards to greater clarity on this issue and on its effective consequences, while hoping that the problem can be fixed quickly and without Typhoon draining the defence budget even more. 

UPDATE: new Defense News article confirms “temporary” reduction to 1500 hours of fatigue life. Eurofighter expects it will take until mid-2015 to test and ensure that requirements are met in the component affected, and that it does not expect significant fleet readiness problems in the meanwhile. Britain and Saudi Arabia are continuing to accept deliveries, while Germany, Italy and Spain are rejecting the new aircraft for now.

UPDATE 2: the other well known problem of Typhoon is always very clear and very annoying. David Cameron has visited the II Squadron RAF in Akrotiri and announced that the UK will deploy a further two Tornado GR4. Moreover, the premier announced the decision to delay by one year the disbandment of II Squadron, which was due to lower its flag in Marham on 31 March 2015 to stand up on 1 April 2015 as the fifth and last Typhoon squadron, at RAF Lossiemouth.
The passage of II Sqn colors to the Typhoon has been delayed by one year (at least), out to April 2016, due to the Typhoon being, despite all efforts, still substantially incapable to conduct complex air to ground work. The old Tornado soldiers on in its place.
It is not yet clear what kind of impact will be felt by the schedule for the standing up of the 5th Typhoon squadron: personnel from the ex 617 and 12 Sqns should have already been directed to Lossiemouth to work on forming this last unit, but the extension of II Sqn as a Tornado formation might delay the completition of the process. 

No real way to tell if the Typhoon structural issues have had any weight of their own in the decision. Most likely no, but, in the facts, the new Typhoons being delivered will not fly for a while, and the build up process for the whole fleet is going to be slowed down significantly.

UPDATE 3: Airbus is optimist that the manufacturing quality problem will not have grave consequences, and that the safe hours cap at 1500 hours will be removed before airframes have to be parked on the ground having reached that limit. We will see.

UPDATE 4: Commander No 1 Group RAF said on October 6 that despite the extension to II Sqn's life as a Tornado GR4 unit, the 5th Typhoon squadron is still expected to stand up in early 2015, and that an adjusted plan is being worked out. 


Data on early Eurofighter airframe durability testing from "Eurofighter, a safe life aircraft in the age of damage tolerance" by Robert Dilger, Dr. Holger Hickethier (EADS) and Michael D. Greenhalgh (BAE Systems), 2007


  1. Wouldnt be the first time someone over stated a problem to get out of contracted purchase.....

  2. It sounds to me just an excuse to stop the next payment being made, as said by TrT above. Apparently it is about some holes that were drilled and not cleaned up before delivery, so although I am no aircraft engineer I wouldn't of though it was that serious but please correct me if I am wrong, but I do appreciate that an aircraft that can fly at Mach two and pull 9g has to be engineered to a very high standard.

    1. It might or might not turn out to be less serious. But i highly doubt they are still stuck at 3000 certified hours, and indeed cutting them back to 1500, for no reason.

  3. Quite a lot going on for the RAF at the moment with not only Typhoon but Tornado's bombing IS and in Nigeria, 2 squadron being kept for another year, Merlin's being handed over (and 28/78 squadrons drawing down) and the first air seeker in action over Iraq.

    Would you consider doing an update and analysis post?

    1. I might, but i'd like to learn about the possible move of some Chinooks to RAF Benson, plust the impact of keeping II Sqn on the formation of the last Typhoon sqn and other things before i can write anything truly significant.

  4. I wouldn't read to much across from how the Germans are handling this and how it's being dealt with in the RAF.

    I'd suspect it's useful way of holding back on deliveries of a/c they don't really want.

    Not sure where some of the websites are getting their info from but it's wrong with regard to FH. Tonkas had a review as they passed 7000 on the way to its 8000 life. There was never a life of 7400FH. LEP 5 should extend it to 12000FH. Although I didn't see it to acceptance but would be sorted now.

    I wouldn't worry to much about the FH ext and stress program on Typhoon, again some of the numbers are out. But it doesn't matter too much, FJ only add FH fairly slowly it's only an issue if you hit the limit and it affects that air force. Ours are being increased now, (or are in the process).

    As to current FH on the RAF's typhoon, this article gives a good indication of the FH and it is publically available.!%40%40%3F_afrWindowId%3Dnull%26_afrLoop%3D414066488412000%26_afrWindowMode%3D0%26_adf.ctrl-state%3D752b6r6oo_109

    1. 7400 hours was given as a figure by minister Dunne, and was also quoted on DESIDER. Someone should warn him, if that's not correct.

  5. That wasn't meant as dig, merely trying to add more information.

    Well quite often information given out by ministers isn't right, same for trap reading material in MoD magazines. God knows who writes them.

    1. In that case DESIDER quoted a written answer to the Commons, as often happens on those journals. I think they need to correct their procedures instead of giving out flat out wrong answers.

      For the rest, let's hope you are right on the flying hours certifications eventually coming. But what with the aircraft which have already passed the 1500 hours safe limit, which as you evidence definitely exist, regardless of what Eurofighter says. Are they grounded now?

    2. By the way, went checking, it was Peter Luff, not Dunne. Added a link in the article. He did say that testing was ongoing at the time (2011) to eventually reach a 8000 hours certification to meet the 2021 OSD. I guess from your comment that testing went ahead despite the OSD being advanced.

  6. In trap reading material, you added; the first part is right about Typhoon, I won't go on about what is fairly small detail, but I don't where they get this stuff from.

    1. I've also added the link to the Written Answer to the Commons, if you like that better. It is identical right down to the single word.

  7. Hi Mr gabrielle

    I have been following your blog for quite a sometime

    sir i want to ask you some questions plz be kind enough to answer it

    1)In the AFM magazine special typhoon issue edition there were reports of
    CFT causing Instability problems in Typhoon & now we are seeing in the news website Spiegel Online which reported that, in the worst case scenario, the fault could result in the plane's hull becoming unstable.

    do these have any relation to each other?

    2)Do the Typhoon consortium group have officially revealed any plans for GaN T/R modules programs like the french & Sweedish?

    3)Does the tranche 3 variants have interferometric receiver on their DASS RWR

    4)Jon lake had published an article combat aircraft monthly jan 2013 magazine in which he says

    ...Combat Aircraft understands that Eurofighter GmbH has resolved this impasse and that there is now an AESA radar ‘road map’, with an initial FSD 'Radar 1’ to meet export requirements in 2015, providing a credible export-standard AESA, followed by a ‘Radar 2 to meet core four-nation requirements around 2017, and eventually a derived 'Radar 3' (almost certainly with a new antenna array) to fulfil the UK’s more ambitious needs......

    .....In ‘Radar 1’ form, the E-Scan Captor should offer equivalent performance to the mechanically scanned version, but with all of the traditional advantages of AESA in terms of reliability and multi-mode flexibility as well as enhanced electronic counter-count enneasu res (ECCM).

    In 'Radar 2’ guise the new radar will offer increased detection and tracking ranges bv comparison with the standard Captor-M radar......

    Is this true that the export variant of Captor E radar (RADAR-1) would have
    no increased detection range than CAptor M as compare to radar-2 which is of partner states only


    1. Regarding the AESA radar, we've heard plans being announced again and again for years. The truth to this day remains that a signed contract to give the go ahead to the AESA adoption is still nowhere to be seen. I doubt there can be anything ready by 2015, and it'll be already good if a contract is finally signed before year's end.

      The interferometric receiver should become part of DASS with Tranche 3, or at least so it was said. I have no way to definitively say if it has been added or not.

      I don't think there is a clear plan for transitioning to GaN T/R modules, but merely the indication that is an option for the future.

      The CFT impact on aircraft stability has not been detailed, but new strakes are being tested in Germany, reportedly to compensate the aerodynamic effects of a CFTs installation.

    2. Thanks for answering my queries

      few things i like to state

      1) regarding GaN T/R modules i dont think it is official acknowledged by the typhoon consortium group itself in their
      future programs also

      this image is from direct latest marketing brochure from typhoon

      2) I do like to ask what is the basic difference between Towed radio decoy & selex Brite cloud expendables radio decoy
      & which one is better?

  8. Replies
    1. No. Nobody ever talked about this again, for all i know...

    2. Interesting that they have brought two squadrons of Tranche 1 back online.

      One wonders whether they are trying to preserve the airframe hours of the more capable tranches.

    3. Interesting that they have brought two squadrons of Tranche 1 back online.

      One wonders whether they are trying to preserve the airframe hours of the more capable tranches.


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