Save, Sweden – On a crisp Saturday, December 7, 2024, a significant chapter in Swedish aviation history was rewritten as the legendary Hkp 4 military helicopter soared into the skies once more. This flight marked the culmination of dedicated restoration efforts, breathing new life into an aircraft that has been integral to Sweden’s military operations for decades.

Originally constructed by Kawasaki Heavy Industries in 1973, the Hkp 4 was officially delivered to the Swedish Navy on May 31, 1974. This marked the beginning of a new era for the Swedish Armed Forces, as the Hkp 4 quickly became an invaluable asset due to its versatility and reliability. Over its operational lifetime, the Swedish Armed Forces utilized a fleet of eight Kawasaki-Vertol 107s and fourteen Boeing-Vertol 107s, with the Hkp 4 serving as a versatile and reliable workhorse until its decommissioning in 2010. These helicopters were integral to a variety of missions, from logistical support to search and rescue operations, showcasing their adaptability and importance in military operations.

The helicopter, known by its designation Y70, made its final military flight on March 1, 2011, before being transferred to the Aeroseum Aviation Museum in Gothenburg. This transition marked a new chapter in the life of Y70, as it moved from active duty to becoming a cherished piece of aviation history. Now under the stewardship of the National Swedish Museums of Military History (SFHM) and the Aeroseum Foundation, Y70 was preserved with the hope of one day returning it to the skies. The decision to preserve and potentially restore Y70 was driven by a recognition of its historical significance and the desire to keep its legacy alive for future generations.

To ensure the continued operation of the historic Yngve 70, both financially and through the specialized expertise provided by dedicated technicians, skilled pilots, and other essential personnel, the support association known as Vertolens Vänner has been founded. This association originates from the 2.hkpdiv, a testament to the deep connections and camaraderie formed during its operational years, and collaborates closely with Aeroseum. Together, they aim to successfully display the Yngve 70 at various airshows and other public events. The primary goal of the association is to keep the helicopter in excellent flying condition for the enjoyment of aviation enthusiasts and the public alike. Through these efforts, the Y70 serves not only as a historical artifact but also as a living symbol of Swedish aviation prowess.

Though retired from active service, Y70 still had untapped potential, and in 2013, Aeroseum established “2 Helikopterdivisionen” (the 2nd Helicopter Division) to maintain its airworthiness. This dedicated team of volunteers and veterans embarked on a mission to keep the helicopter operational, conducting regular maintenance and ground runs. Their dedication reflects a broader commitment to preserving aviation history and ensuring that the stories and achievements of aircraft like the Hkp 4 are not forgotten.

The journey to restore Y70 was fraught with challenges. In 2018, the helicopter achieved a major milestone by being registered for civilian flight. This was a significant achievement, symbolizing the successful transition of Y70 from a military asset to a civilian icon. However, a hydraulic servo leak discovered during preparations for the Swedish Navy’s 500th anniversary celebration in 2022 posed a significant obstacle. The restoration team faced the daunting task of replacing or renovating the servos that controlled the rotor discs, requiring significant funding of over 500,000 SEK. Their determination and hard work eventually paid off, allowing Y70 to take flight once more. This accomplishment was not just a technical victory but also a testament to the passion and dedication of everyone involved in the restoration process.

The Hkp 4’s history is replete with remarkable achievements. It became synonymous with submarine hunting during the 1980s, frequently appearing in media reports as it hovered over Swedish waters with its sophisticated listening equipment. This capability was crucial during the Cold War when the threat of underwater incursions was a significant concern for Sweden. The helicopter also played a crucial role in maritime rescue operations, including the Estonia disaster, where its capabilities were vital in saving lives. Such operations highlighted the Hkp 4’s versatility and its critical role in both military and humanitarian missions.

Beyond its military applications, the Hkp 4 excelled in complex medical transports, heavy lifting, and firefighting. It served as a critical asset during emergencies, transporting firefighters and equipment to the Scandinavian Star during a fire and participating in rescue missions during the Estonia disaster. These missions underscored the helicopter’s ability to adapt to various roles, proving its worth in both peacetime and conflict.

Restoring Y70 not only preserves a vital piece of Swedish military history but also showcases the technological advancements in helicopter design. As the sole airworthy Hkp 4 in Europe, it stands as a testament to the dedication and passion of those who worked tirelessly to bring it back to life. It serves as a bridge between past and present, allowing new generations to appreciate the technological innovations and challenges of previous decades.

The Hkp 4’s storied past and recent revival underscore its enduring legacy as a cornerstone of the Swedish Armed Forces. From its origins as a medium-heavy transport helicopter developed by Boeing for military use to its role in submarine hunting and civil support operations, the Hkp 4 remains a symbol of resilience and innovation. Its continued presence at airshows and public events ensures that its legacy lives on, inspiring future generations of aviators and engineers. The story of the Hkp 4 is not just about a helicopter; it’s about the people who designed, flew, maintained, and ultimately saved it from obscurity, ensuring that its legacy will endure for years to come.