Field notes from the frequency.

Writing on ATC voice, aviation data, and public information infrastructure. Direct, technical, no buzzwords. 1 post · more in progress

• RESEARCH·2026-05-02·chien.digital

  How we build a case

  From raw VHF audio to a published case study — the methodology behind hungATC's research archive.

• HA-CS-002·RCTP·2026-04-23

  CI28: A Complete Record of an Uninvestigated Event

  On 2 November 2019, an unidentified man climbed into the main gear bay of China Airlines CI28 at Taipei Taoyuan; the crew of Asiana 712, holding behind, spotted him and called Taipei Tower. The event falls outside TTSB's safety-investigation mandate, and no standalone CAA bulletin was issued — so no official report exists. In its absence, four minutes of tower audio plus press coverage are the only widely-circulated public record. This piece archives that material in an indexed, citable, traceable structure — as an example of how an uninvestigated event can still be fully recorded.

• HA-CS-001·RCSS·2026-04-22

  CI202: Nineteen Days of Silence — How the Public Saw the Truth First

  On 14 June 2020, a China Airlines A330 landed at Taipei Songshan with all three primary flight-control computers failing near-simultaneously; manual braking stopped the aircraft 9 metres from the runway end. Public reporting appeared 19 days later; the TTSB final report took 15 months. Inside that gap, public data was scarce in kind. This piece argues why ATC tower audio reached the public record faster than the investigation did, and what its specific place is among ADS-B, NOTAM, and DFDR.