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Under previous deal, KF21 fifth prototype should be manufactured in Indonesia, just like how CN235 being developed, one prototype manufactured in Spain, one prototype manufactured in Indonesia = 2 prototype = 50:50 while 20 % stake in KF21 programs means only one prototype being manufactured in Indonesia while 5 prototypes manufactured in Korea. (6 flying prototypes, 2 static prototypes).

But due to financing problem from Indonesia side, including the IFX manufacturing line is not yet completed, all of prototypes are built in Korea including the testing work

If Indonesia completed financial investment in 2026 along with completion of KF21 development block 1 then the data and KF21 prototype (5th) will be given to Indonesia based on the deal between 2 countries. If data is given before completion of program and Indonesia cost share, it is pretty unlogical right ?



This article is from March 24,2025 seems the project collaboration was suspended after the USB incident.
 
I thought the Koreans would build the prototype in Korea and send it over to Indonesia for testing?

Nope, previous deal said one prototype being built in Indonesia, but due to Indonesia cost share problem and unfinished IFX production line then all flying prototypes are built in Korea

5th prototype is for continous development and it is pretty important for Indonesian Aerospace, the testing data conducted in Korea will be shared to Indonesia after the program completed and Indonesia completed its financial contribution inshaAllah


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Here

Indonesian KFX/IFX project manager being interviewed in 2016

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Create a fighter jet, Indonesia prepares massive resources

Anggi Kusumadewi, Resty Armenia, Prima Gumilang | CNN Indonesia
Wednesday, 02 Mar 2016 12:39 WIB

1744321956169.jpeg
PT Dirgantara Indonesia has prepared composing hangars, titanium hangars, production hangars, and final assembly hangars for fighter aircraft. (ANTARA/Novrian Arbi)


Jakarta, CNN Indonesia -- “Warplanes are like cell phones. The technology has changed over the years, whether it's about electronics, sensors or weapons."

Heri Yansyah, Head of the Korea Fighter Xperiment/Indonesia Fighter Xperiment (KF-X/IF-X) program at PT Dirgantara Indonesia, said this while talking to CNNIndonesia.com, Friday (19/2).

“So Indonesia must be able to upgrade this ever-changing technology. If you don't have the ability to upgrade, then buy the same aircraft as neighboring countries, then in two or three years, Indonesia will be defeated," said Heri.

Although comparing fighter planes with mobile phones, to make it far from easy. It took more than 10 years to develop the KF-X/IF-X which was designed to be a 4.5 generation multi-role fighter jet with technology approaching the capabilities of a 5th generation stealth fighter.

Since the jet engine was first developed in 1946, fighter aircraft have evolved to the fifth generation. This latest generation combines stealth technology for undetected radar, supersonic roaming capabilities, and new integrated sensors.

The only 5th generation fighter aircraft currently in service is the US Lockheed Martin F-22 Raptor. While a number of other jets from that generation, such as the F-35 Lighting II and the Sukhoi PAK FA, are still at the testing stage.

To make the KF-X/IF-X prototype, Indonesian and South Korean scientists will work hand in hand at the Korea Aerospace Industries headquarters in Sacheon, South Gyeongsang Province.

"At the peak of prototyping, 200 Indonesian engineers will be involved," said Heri, who in the 2011-2012 period went to South Korea for 18 months to work on the first phase of the KF-X/IF-X project, namely concept development.

The number of Indonesian engineers who went to South Korea in the second phase of work – prototyping – starting in 2016 was far more than the first phase, which only amounted to 52 people.

The Indonesian scientists will come to South Korea gradually over the next 10 years. "There are engineers who have to stay there for a full 10 years, but there are also those who are rotated," said Heri.

Build facilities

Domestically, Indonesia is speeding up the preparation of human resources and technology, starting from research on the core technology of fighter jet engines, materials, avionics, aerodynamics, to building a laboratory to support this research.

In addition, although the production of KF-X/IF-X is centered in South Korea, the headquarters of PT Dirgantara Indonesia in Bandung, West Java, will be no less busy. PTDI will monitor all the work on the fighter aircraft.

PTDI, for example, has prepared the Indonesian Design Center (DCI) to build technology, infrastructure and simulation capabilities. In this place, all stages of work on the KF-X/IF-X in South Korea will be communicated.

DCI is a mirroring of the Design Center building which was also built in Sacheon, South Korea. The Design Center in Sacheon is a kind of sealed and sterile building. People who enter it are prohibited from bringing flash drives and computers. There, Indonesian and South Korean scientists will work together.

Indonesia was also assigned the task of making aircraft components for the right wing and tail, as well as under-wing reinforcement.

See also: Indonesia's Steep Road Makes a Stealth Fighter Plane

Also, Indonesia gets a share to make aircraft prototypes. A total of eight prototypes will be built – six flying prototypes, and two non-flying prototypes for structural testing.

"The fifth prototype will be made here," said Heri. "Why the fifth? Because this is the first time Indonesia has developed a fighter aircraft. For the first and second prototypes, Indonesia is not ready," added the PTDI aerodynamics expert.

Therefore, PTDI has also prepared composing hangar facilities, titanium hangars, production hangars, and final assembly hangars for fighter aircraft.

 

This article is from March 24,2025 seems the project collaboration was suspended after the USB incident.

Duh, it never suspended, Indonesian engineers keep working there. The meaning of stall is that it getting nowhere in term of new deal of reduced Indonesia financial contribution (Indonesia asking it)
 
Duh, it never suspended, Indonesian engineers keep working there. The meaning of stall is that it getting nowhere in term of new deal of reduced Indonesia financial contribution (Indonesia asking it)
Mr. Seok said, “It is also true that we have been struggling with differences in positions in some areas recently, and we hope to strengthen mutual communication through this meeting, overcome the current difficulties, and further strengthen the cooperation between the two countries.” The statement appears to include a quick revision of the joint development agreement currently under negotiation between the two countries, which reduces the amount of the development contribution originally agreed to be paid by Indonesia at KF-21 to 60 billion won, and maintains a contract to produce 48 KF-21s locally in Indonesia.

 
Mr. Seok said, “It is also true that we have been struggling with differences in positions in some areas recently, and we hope to strengthen mutual communication through this meeting, overcome the current difficulties, and further strengthen the cooperation between the two countries.” The statement appears to include a quick revision of the joint development agreement currently under negotiation between the two countries, which reduces the amount of the development contribution originally agreed to be paid by Indonesia at KF-21 to 60 billion won, and maintains a contract to produce 48 KF-21s locally in Indonesia.


You are taking things to lightly, ther is a major breach of trust. They are giving you the blame, you insist not fund the program as you made a deal. And a data breach, it does not look that great. You are taking it to lightly...

“Minister Seok appears to have focused on finding a breakthrough for revising the KF-21 agreement,” a defense industry insider told the JoongAng Ilbo. “However, it remains to be seen whether this will lead to tangible results.”
 
Mr. Seok said, “It is also true that we have been struggling with differences in positions in some areas recently, and we hope to strengthen mutual communication through this meeting, overcome the current difficulties, and further strengthen the cooperation between the two countries.” The statement appears to include a quick revision of the joint development agreement currently under negotiation between the two countries, which reduces the amount of the development contribution originally agreed to be paid by Indonesia at KF-21 to 60 billion won, and maintains a contract to produce 48 KF-21s locally in Indonesia.


Well its supposed to go into mass production in 2026. Thats one year from now, so idk what exactly is left for indonesia to contribute to development? They haven't even delivered a prototype here. This is starting to look like the FGFA situation between Russia and India, where the Russians weren't giving access and eventually India left the program.
 
Well its supposed to go into mass production in 2026. Thats one year from now, so idk what exactly is left for indonesia to contribute to development? They haven't even delivered a prototype here. This is starting to look like the FGFA situation between Russia and India, where the Russians weren't giving access and eventually India left the program.

What the heck with your stubborness ?

Indonesia is developing the plane since 2011 which is the start of KF21 program (Technology Development phase)

The plane will keep being developed and it means Indonesian engineers will keep working on it inshaAllah

Do you understand what it means of Test Bed Plane ?

The 5th prototype is mean to develop the plane continously, just like CN235 test bed so this is why we see there is F16 with many block

There the prototype will be researched and worked on
 
Indonesia participating in Kaan project I would say will not likely effect KF21/IFX program. It can complement with current KF21/IFX program. The one that could potentially become victims are F15 EX acquisition

As Indonesia has big territory, so naturally we need heavy fighters that currently is served with Su27/32, so Kaan program if it is true Indonesia will participate, so it will fulfill the need on this heavy fighter type

Indonesia government has already put money for KF21/IFX payment for 2025. I have put the document in last page of IFX thread

Well its supposed to go into mass production in 2026. Thats one year from now, so idk what exactly is left for indonesia to contribute to development?

The response is straightforward: there is little to no contribution. I hold a deep affection for Indonesia and its people, which is why I appreciate @Indos.

However, he seems to be living in a fantasy. The project is named KAI KF-21 Boramae, not IFX or KFX/IFX, basically rendering Indonesia's involvement largely inconsequential. Moreover, referring to it as IFX was an overreach from the start. What is the actual extent of their contribution? What can they contribute that South Korea couldn't on her own? On top of that, the United States would not have permitted them to gain significant insight into the project or its technological underpinnings anyways.

It is crucial for him to recognize the reality of the situation. I mean, the British contribution to the F-35 project has been substantial, yet one does not see any British individual marketing the F-35 as a British aircraft, right?

I suspect that Indonesian politicians are much more cognizant of the KFX/IFX debacle than Indos realizes. I also hold the South Koreans accountable; they presented this project as a collaboration between two equal partners, neglecting the potential for U.S. intervention and the technical challenges faced by Indonesia.

It is time for Indonesia to wake up, recognize this historical chance and seize this opportunity.
 
The response is straightforward: there is little to no contribution. I hold a deep affection for Indonesia and its people, which is why I appreciate @Indos.

However, he seems to be living in a fantasy. The project is named KAI KF-21 Boramae, not IFX or KFX/IFX, basically rendering Indonesia's involvement largely inconsequential. Moreover, referring to it as IFX was an overreach from the start. What is the actual extent of their contribution? What can they contribute that South Korea couldn't on her own? On top of that, the United States would not have permitted them to gain significant insight into the project or its technological underpinnings anyways.

It is crucial for him to recognize the reality of the situation. I mean, the British contribution to the F-35 project has been substantial, yet one does not see any British individual marketing the F-35 as a British aircraft, right?

I suspect that Indonesian politicians are much more cognizant of the KFX/IFX debacle than Indos realizes. I also hold the South Koreans accountable; they presented this project as a collaboration between two equal partners, neglecting the potential for U.S. intervention and the technical challenges faced by Indonesia.

It is time for Indonesia to wake up, recognize this historical chance and seize this opportunity.

The project name is indeed KFX/ IFX. KF21 Boramae as project is media calling it. Look like the dellution is on you and even many try to erase the actual name of the project and use KAI KF21 as name in Wikipedia. Some respected media does mention the real name particulatly like some credible Korean media, or Jane Defense, occationally.

I dont need to talk further. There is thread about it with credible sources I made

It is you and many who actually dont want to accept reality and keep thinking Indonesia has little contribution despite KAI CEO talking otherwise.

No need to talk further if you want to believe what you wish or want to believe. For example on IFX thread put there for years, I put photo of important meeting of the project and all can see the name of project is indeed KFX/ IFX, big photo on first page, first post, but some how people like you want to relies on unreliable media or twiter

No need to talk further, just believe what you want to believe

The level of dellution is too high even thinking Indonesia is not yet contributing due to their thinking that dispute is still going on as Hyperman post despite I have shown that there are 114 Indonesian engineers during peak of detail design in July 2019 as source is DAPA official comment with credible Korean media who wrote

Yes all of engineers come back in Mei 2020 when design is already completed, but as I tough that you guys relies on many unreliable comment on defense forum or twitter that many I see has same believe like Hyperman, but they are not PDF members right who can see my thread here saying Indonesian engineers coming back in August 2021.

Actually Indonesian engineers keep working on double seats detail design and making part of KF21 prototype during the time they are not in Korea in 2020. Just use logic here, there is so called both cost share and work shares when there is joint development. And for example Indonesian engineer manager like Hery Yansah has already work on Indonesian aerospace since 1980 and working in many project like CN235/ N250/ N2130/ N219, and thus you think we cannot design a plane ?

For information, the very seniors work during preliminary design when the look of KF21 we see Today created (TD phase)
 
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About the return of engineer is in previous KFX/IFX thread I posted in old forum. I will update current thread under new forum, but here is the news about the return

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15:37 August 11, 2021


Indonesian engineers to return to S. Korea for KF-21 joint development​


1744432329200.jpeg
This file photo taken on April 9, 2021, shows South Korea's first prototype of the next-generation KF-X fighter, officially dubbed KF-21 Boramae, at the Korea Aerospace Industries Co. facility in the southeastern city of Sacheon. (Yonhap)


SEOUL, Aug. 11 (Yonhap) -- Indonesian engineers who left South Korea last year amid speculation the Southeast Asian country was seeking to quit their joint fighter jet development will return this month after Jakarta reaffirmed its commitment to the project, the arms procurement agency said Wednesday.

According to the Defense Acquisition Program Administration, 32 Indonesian engineers are undergoing administrative procedures, such as visa application, to return to the Korea Aerospace Industries headquarters in the southern city of Sacheon.

Indonesia agreed to partner in South Korea's KF-21 project aimed at developing a new fighter jet by 2026, and promised to shoulder 20 percent of the total development cost of 8.8 trillion won (US$7.6 billion), or about 1.7 trillion won.

But Indonesia's 114-strong engineering team returned home in March last year after the country's failure to make payments gave rise to speculation that it could quit the program. Indonesia stopped making payments after investing 227.2 billion won, with around 700 billion won overdue.

"The Indonesian government reaffirmed its continued commitment to the KF-21/IF-X joint development, and sought cooperation for its engineers' prompt return to South Korea," the agency said in a release.

Starting with the 32 engineers, around 100 personnel will be back at the Sacheon plant by the end of the year.

 
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Very good news, not only is it beign exported, there are now alternative supply chains and production lines being developed that could boost capacity in high intensity conflicts where replenishment is needed.
 
About the return of engineer is in previous KFX/IFX thread I posted in old forum. I will update current thread under new forum, but here is the news about the return

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15:37 August 11, 2021


Indonesian engineers to return to S. Korea for KF-21 joint development​


View attachment 111925
This file photo taken on April 9, 2021, shows South Korea's first prototype of the next-generation KF-X fighter, officially dubbed KF-21 Boramae, at the Korea Aerospace Industries Co. facility in the southeastern city of Sacheon. (Yonhap)


SEOUL, Aug. 11 (Yonhap) -- Indonesian engineers who left South Korea last year amid speculation the Southeast Asian country was seeking to quit their joint fighter jet development will return this month after Jakarta reaffirmed its commitment to the project, the arms procurement agency said Wednesday.

According to the Defense Acquisition Program Administration, 32 Indonesian engineers are undergoing administrative procedures, such as visa application, to return to the Korea Aerospace Industries headquarters in the southern city of Sacheon.

Indonesia agreed to partner in South Korea's KF-21 project aimed at developing a new fighter jet by 2026, and promised to shoulder 20 percent of the total development cost of 8.8 trillion won (US$7.6 billion), or about 1.7 trillion won.

But Indonesia's 114-strong engineering team returned home in March last year after the country's failure to make payments gave rise to speculation that it could quit the program. Indonesia stopped making payments after investing 227.2 billion won, with around 700 billion won overdue.

"The Indonesian government reaffirmed its continued commitment to the KF-21/IF-X joint development, and sought cooperation for its engineers' prompt return to South Korea," the agency said in a release.

Starting with the 32 engineers, around 100 personnel will be back at the Sacheon plant by the end of the year.


Bro, you live in a bubble.

Many Indonesians online have a more pragmatic view of the country's actual role in the project than you.

This is primarily a South Korean initiative, and Indonesia's involvement is significantly smaller than that of many partners in the US-led F35 program. Just for comparison.

Building a fighter jet requires thousands, if not tens of thousands, of engineers, including those from suppliers and subsystems. You know that, right?

On top of that, you don't fully grasp the political ramifications of the accusations from South Korea. Their perspective and mindset is quite different, and they seem to have dismissed you as a partner. You appear to be the only one still holding onto the notion of IDX. This project was never yours to begin with; even Indonesia's initial contribution accounted for just 20 percent of the total budget.

Do you genuinely think that a contribution of now only 400 million USD and the involvement of 32 or 132 high-ranking engineers qualifies you as an equal partner in a project like the KFX?

South Korea's defense authorities approved a plan last year to reduce Indonesia's contribution to the project to build the advanced supersonic fighter by 2026 to 600 billion won ($409 million) from the original amount of 1.6 trillion won, following Jakarta's repeated payment delays(...)The project had also been hampered by technology leak allegations involving a team of Indonesian engineers dispatched to South Korea.

Indonesia has indeed gained some level of technology transfer and experience, and it will probably play a role in manufacturing specific components. However, your participation remains quite restricted.

Why are you unable to face the facts? If everything were as positive and seamless as you claim, why would your government be interested in KAAN and seek to acquire various fighter jets?
 
What ever dude please learn the history, if there is no Indonesia participation, unlikely you will see KF21/ IFX with current design

KAI is offering KFX - E ( C- 501) with single engine during critical phase between 2013 - 2015 before EMD phase when Koreans gov and parliament were fighting internally to chose between KAI design vs ADD design (ADD and Indonesian team - TD phase). KFX - E ( C - 501) is Much less ambitious and cannot be developed into real 5 gen and beyond. LM is also backing C501 design since it will be much less cost and much less complext to develop and the plane will not likely be able to challenge F35.

C103 design ( TD phase) that is now refined to C109 design ( EMD phase) as current KF21 design is unlikely to be chosen if there is no Indonesia that also participated during TD phase ( no KAI and LM in this phase, both are selected during tender in 2015 for EMD phase - other participant is another Korean company that is backed by European aerospace consortium ( those who develop Eurofighter ) ).

This post is also backed by credible source if you want to find it in IFX thread. I dont want to spoon feed you all the time, there is IFX thread I made with credible source.

Most of you dont know the history, I think Deino is pretty knowledgeable of what happening since 2009

I will end in here
 
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New Peak in Defense and Aviation Industry Exports!

🚀 In April 2025, our defense and aviation industry realized exports of 539 million dollars, an increase of 54%.

Our exports increased by 67% in the January-April period, reaching 2 billion 238 million dollars.

The total for the last 12 months increased by 42% to 7 billion 635 million dollars.

These figures are not just a momentary success; they are an indication of a rise that is sustained with determination and supported by strategic steps.

As the Presidency of Defense Industries, we are working with all our might to ensure the sustainability of exports with high technology-based, high value-added products.

Together, we will further strengthen this chain of success that extends from large-scale companies to SMEs.

I wholeheartedly congratulate our industrialists, laborers and all our stakeholders who contributed.

Let's continue to work tirelessly for a Turkey that grows with national technologies!

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