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Ong-arj Lerdpong (née Féng, 馮; born 7 November, 1935) is a Thai-born Chinese former civil servant celebrated for his significant

contributions to aviation in Thailand. Born in Nakhon Ratchasrima, Thailand, he served as the Deputy Director General of the Department of Commercial Aviation, the predecessor to the Department of Air Transport. His groundbreaking initiative of implementing the Instrument Landing System (ILS) in Thailand was a key milestone in the modernization of the nation's aviation infrastructure.

Early Life and Education
Ong-arj Lerdpong was born as Féng on 7 November, 1935, in Nakhon Ratchasrima, Thailand. Growing up in a Thai-Chinese family, his culturally diverse upbringing shaped his worldview and instilled in him a strong commitment to community service and technological innovation.

In 1953, Lerdpong enrolled in the Radio Department at Bangkok Technical College, which is now known as Rajamangala University of Technology Krungthep. His academic prowess earned him the prestigious King's Scholarship, which allowed him to further his studies in Advanced Radio in the United States of America.

In 1985, while studying the esteemed Chief of Staff Course, Class 29 (หลักสูตรเสนาธิการกิจ รุ่นที่ 29 (2528)), Lerdpong published a pivotal research journal about the flight test of the Instrument Landing System (ILS) in Thailand. This influential work is still referenced today and is utilized by the Royal Thai Air Force.

Personal Life
Ong-arj Lerdpong is married to Nongnard Lerdpong, née Ruttanasirimaneevate. Together, they have four children: Intira Ratana-apiromyakij (née Lerdpong), Ittipon Lerdpong, Noppadole Lerdpong, and Nateerai Yuwaprecha (née Lerdpong). His family has been a constant source of support throughout his career and personal life.

Career
Lerdpong launched his career in the aviation industry, where he demonstrated exceptional talent and dedication. He later served as the Deputy Director General of the Department of Commercial Aviation, now known as the Department of Airport, under the Thai government's Ministry of Transport. His leadership was instrumental in devising and implementing strategic initiatives that significantly advanced Thailand's aviation infrastructure and operations.

Instrument Landing System (ILS) Implementation
One of Lerdpong's most significant contributions to Thai aviation was the introduction and implementation of the Instrument Landing System (ILS) in Thailand. The ILS, a critical navigational aid, significantly enhances the safety and efficiency of aircraft operations, particularly during challenging visibility conditions.

His research and successful flight tests during his time at the Chief of Staff Course became the foundation for the implementation of the ILS in Thailand. This technological leap forward, initiated by Lerdpong, is still in use today by institutions such as the Royal Thai Air Force, testifying to the enduring impact of his work.

Legacy
Ong-arj Lerdpong's influence on Thailand's aviation sector is profound. His visionary leadership and dedication to modernizing the country's air transport infrastructure have left an enduring mark on the industry. His work on implementing the ILS system, in particular, stands as a testament to his dedication to improving the safety and efficiency of air travel in Thailand.

Lerdpong's contributions continue to serve as a benchmark for future leaders in the aviation sector, inspiring the next generation to strive for ongoing innovation and safety in air travel.