The Use of High Frequency Radio on Aircraft Operating in the Uncontrolled Airspace of Sam Ratulangi International Airport Manado

Abstract

High Frequency (HF) radio remains essential for maintaining two-way communication between pilots and air
traffic controllers, particularly in uncontrolled airspace beyond the reach of Very High Frequency (VHF) signals.
This communication is critical for flight safety, especially for small aircraft operating in remote or transoceanic
areas around Sam Ratulangi International Airport, Manado. However, some aircraft are still operating without HF
equipment, posing potential hazards to other flights within the responsibility of Ujung Pandang FIC Makassar
Sector. This study aims to examine the use of HF radio by aircraft operating in uncontrolled airspace around Sam
Ratulangi International Airport and its impact on flight safety and traffic flow. A qualitative research approach
was applied, with data collected through field observation, in-depth interviews with Air Traffic Control (ATC)
personnel at Perum LPPNPI Manado Branch, and documentation of operational procedures and regulations
regarding HF radio usage. The findings indicate that HF radio remains a primary and backup communication tool
in areas beyond VHF coverage. The main challenges include poor audio quality and frequent interference.
Moreover, some aircraft still lack HF radios, highlighting the need for stricter equipment standards and regulatory
socialization to enhance aviation safety in the region.