TÜMOSAN military engine programs and the ALTAY powerpack
Quick answer: TÜMOSAN’s real weight in the Turkish defense industry lies less in vehicle production than in its military diesel engine and powerpack programs. The company’s known files in this field fall under four headings: the ALTAY tank powerpack development contract, conducted between 2015 and 2017 and terminated by mutual agreement; the ÖMTTZA engine supply contract signed with FNSS in 2019, covering 100 armoured vehicles; the ALP powerpack family developed for light tracked armoured vehicles; and the rewind engines built for aircraft arresting systems. This file presents each program with its dates and with sourced information only.
ALTAY powerpack: the 2015 contract and the 2017 termination
The Undersecretariat for Defence Industries (today’s SSB) signed the Powerpack Development Project contract covering the ALTAY tank’s engine and transmission with TÜMOSAN on March 17, 2015; press reports of the period put the contract value at approximately 190 million euros. For technical support, TÜMOSAN signed a Technical Support Provider agreement with Austria’s AVL List GmbH on October 7, 2015.
The process ended in two stages. On January 16, 2017, TÜMOSAN terminated the AVL agreement on the grounds that obligations had not been fulfilled; reports at the time pointed to Austria’s decision to restrict military exports to Turkey as the background to that step. On February 24, 2017, the powerpack development contract was terminated by mutual agreement with the SSM, as notified to the stock exchange. ALTAY series production later proceeded under BMC; according to press reports, the first T1-configuration tanks were delivered in 2025, fitted with the South Korean Doosan DV27K engine and SNT Dynamics EST15K transmission. No current TÜMOSAN role in the ALTAY program has been officially announced.
ÖMTTZA: engines for 100 vehicles
TÜMOSAN’s most concrete contract in military engines is the Indigenous Engine Supply Subcontract signed with FNSS on December 25, 2019. Coordinated by the SSB, the contract covers the engines and integrated logistics support for 100 Special Purpose Tactical Wheeled Armoured Vehicles (the 6×6 and 8×8 PARS family) built for the Turkish Land Forces and the Gendarmerie General Command; the term, including warranty, is 72 months. The defense press reports that these vehicles use TÜMOSAN engines of 450 and 530 hp. The engines’ technical details are covered in the TMSN X series file.
The ALP powerpack family
ALP is a powerpack family that combines a TÜMOSAN engine and a TÜMOSAN transmission in a single package. The company first presented the ALP powerpack, aimed at light and medium tracked armoured vehicles with combat weights up to 18 tonnes, at IDEF’19; options with indigenous gearboxes were shown at IDEF 2021. The SSB 2026 catalog lists the family in four configurations: ALP 1, ALP 2, ALP 3 and ALP 4. In its SAHA EXPO 2024 and IDEF’25 announcements the company described ALP1 and ALP2 as “Turkey’s only fully indigenous powerpack”; this is a company statement. The powerpacks’ cooling, exhaust and air-intake systems are integrated into the package.
Rewind engines for aircraft arresting systems
Under a supply contract signed with SDT Space and Defence Technologies, TÜMOSAN produces the rewind engines used in aircraft arresting systems at military airfields. According to the defense press, the contract covered 40 engines; TÜMOSAN’s 3-cylinder, 55 hp diesel replaced the US-built Wisconsin petrol engines previously used in these systems. According to TRT Haber, 60 engines were delivered for Air Force Command use within a year. The SSB 2026 catalog lists the “Aircraft Arresting System Rewind Engine” as a standalone product.
Program table
| Program | Date | Scope | Status |
|---|---|---|---|
| ALTAY powerpack | 17.03.2015 – 24.02.2017 | Development of a 1,500 hp-class tank powerpack | Terminated by mutual agreement |
| ÖMTTZA (FNSS) | 25.12.2019, 72 months | Engines + logistics support for 100 vehicles | In force (open source) |
| ALP powerpacks | First shown at IDEF’19 | Powerpacks for tracked vehicles up to 18 t | On display; no order announced |
| Rewind engine (SDT) | Contract circa 2020 | 40+ units of 55 hp diesel | Deliveries made |
All of these programs run on TÜMOSAN’s tractor and engine production infrastructure. The naval engine programs are covered in the marine engines file, and the full product set is listed in the defense products guide.
Frequently asked questions
Why did TÜMOSAN’s ALTAY contract end?
The contract was not lost; it was terminated by mutual agreement with the SSM on February 24, 2017. Before that, TÜMOSAN had terminated its agreement with technical support provider AVL on the grounds of unfulfilled obligations; press reports of the period cited Austria’s export restrictions as the decisive factor.
Which engines do the ÖMTTZA vehicles use?
According to the defense press, the FNSS PARS family 6×6 and 8×8 vehicles use TÜMOSAN diesel engines of 450 and 530 hp.
Which vehicles is the ALP powerpack aimed at?
According to the company, light and medium tracked armoured vehicles with combat weights up to 18 tonnes; it packages the engine, transmission, cooling and exhaust subsystems together.
Can TÜMOSAN build a tank engine?
The company ran a 1,500 hp-class tank powerpack development contract in 2015-2017, but the project was terminated before completion. Its current product range covers military diesels up to 530 hp.
Sources and verification note
All dates in the ALTAY section are taken from press reports based on stock exchange disclosures of the period; the contract value is a press figure. Accessed: August 13, 2026.
- https://www.milliyet.com.tr/ekonomi/altay-tanki-sozlesmesi-iptal-oldu-tumosan-hisseleri-cakildi-2403933
- https://www.bloomberght.com/milli-proje-altay-tankinda-guc-grubu-sozlesmesi-iptal-oldu-1988874
- https://www.hurriyet.com.tr/teknoloji/ozel-maksatli-taktik-tekerlekli-zirhli-araca-yerli-ve-milli-motor-41406064
- https://www.aa.com.tr/tr/bilim-teknoloji/paletli-zirhlilari-tasiyacak-yerli-motor-idefte-/1465908
- https://www.aa.com.tr/tr/savunma-sanayisi/2025te-tank-fabrikasi-bitecek-ilk-altay-teslim-edilecek/3373941
- https://www.savunmasanayist.com/tumosan-ucak-durdurucu-sistem-yerli-motor/
- https://www.trthaber.com/haber/savunma/turk-jetleri-yerli-motorla-piste-guvenli-iniyor-662049.html
- https://www.tumosan.com.tr/tr/haberler/tumosan-saha-expo-2024te-yuksek-performansli-urunleriyle-dikkat-cekti
