Chapter 3 — Between Two Runways

The recorder placed in the middle of the table, an old gray metal box with an analog knob, emitted Boi Thu's own voice through a small speaker, somewhat distorted due to sound compression, but still clear enough for her to recognize each pause, each inhale before speaking.

"Victor Tango two zero five, go-around, I repeat, go-around immediately..."

Sai Dinh Khoi pressed the pause button right in the middle of a sentence, his fingers were thick and strong, the decisive movements of someone who had been doing this job for more than twenty years. He sat across from her in a small conference room on the second floor of the executive building, a room with no windows, only quiet air conditioning and steady white lights across the ceiling.

Before turning on the tape recorder, he spent nearly ten minutes explaining the process: this was not a disciplinary session, he said, but a human factors analysis reconstruction of the chain of events, in which every decision was placed in the context of the information available at each moment, not a context that was seen only after it was all over. He called it the principle of "not judging with the eyes of those who know the results." Boi Thu had heard this phrase during regular training courses, but hearing it from the person who was about to interrogate him had a completely different nuance.

On the table, next to the recorder, Khoi also placed a printout of the raw radar data — a time series recording each location update, transponder code, and reported altitude of both targets. He pointed to a small column of numbers, the interval between two consecutive updates of Tra Son station's SSR system ranged from four to six seconds, instead of the standard of less than three seconds on more modern stations.

"I'll include this in the contributing cause analysis," he said, without looking up. "Not to alleviate anyone's responsibility, but because it's part of the real picture."

"At this point," Khoi said, his voice unhurried, almost detached from the tense content emanating from the machine, "have you determined that go-around is the only option, or are you considering any other options?"

"There is no other option." Boi Thu answered immediately, without thinking, because this was the answer she had asked herself dozens of times in the past three days. "The elevation difference is closing faster than I could calculate with any vector solution. Go-around is the fastest option to increase the vertical distance immediately."

Khoi writes something down in a notebook, not on a computer, a habit he kept from his time as an air traffic controller before moving to the flight safety investigation department. "Good. Now I want to go back exactly thirty seconds before that moment."

He rewound the tape and pressed play. Kha Viet Bach's voice rang out, hesitant, his words still had the confused tone of a newbie: "Two thousand six hundred... is increasing rapidly, sister, it's not standing still, there's something..."

“Your student took about a second and a half between detecting the anomaly and giving you a full report,” Khoi said, not as an accusation, just as an objective observation read off the stopwatch. "Did you notice that at the time it happened?"

Boi Thu sat silently for a while. The question was simple, almost harmless, but it touched on something she had been trying not to think about since that afternoon.

“Yes,” she said. "I did notice."

"But you didn't mention that in the initial report."

"Because it doesn't affect the processing results. I acted based on my own radar data, not just on the student's reports."

Khoi nodded, continued writing in the notebook, then looked up at her, his eyes calm but not superficial. "I'm not asking because I think it affects the outcome, controller Ky. I'm asking because I'm trying to understand how you react to other people's tardiness in a high-pressure situation."

That sentence hung in the middle of the room longer than she wanted.

"I didn't react in any particular way," she said. "I act."

"That's right." Khoi closed his notebook and placed his hand on the table. "And that's exactly what I need to note: you don't wait for someone else to confirm before acting. Many people, even experienced controllers, will take an extra second or two to verify information before issuing an emergency order. You don't lose a second."

He pressed the button for the tape to continue, recording the rest of the incident, the sound of the engine accelerating, the sound of the pilot re-reading the command, and then the long silence after the two targets had separated, the silence that the recorder still faithfully recorded every second, including her own sigh at that time.

"Now," Khoi said, turning off the phone, "I need to ask you about something else, not directly related to the incident that day, but within the scope of the file I must review according to regulations."

Boi Thu had predicted this sentence would come, ever since Vong mentioned her previous professional records, but when it actually came, she still felt a cold streak running down her spine.

"Eight years ago, you were an intern at Bach Lung air traffic control station, under the guidance of controller Doan Khac Thuyen. Is that right?"

"Correct."

"She was present during the night shift when the training flight accident occurred, killing the flight student."

This is not a question. It was a statement, said with the caution of someone who had read the file carefully before entering this room.

"I'm present," Boi Thu said, her voice still outwardly calm, even though inside her chest it felt like someone had just tightened a rope around her lungs. "As an observer, I have no right to issue orders and bear no legal responsibility in that incident. This was clearly stated in the investigation conclusion at that time."

"I know," Khoi said. "I read the entire file before coming here. I didn't ask about liability."

"So what are you asking about?"

Khoi looked at her for a long time, his eyes were not threatening, but sharp enough to make her understand that he had seen something that all the investigation records eight years ago had not recorded.

“I ask because I want to know,” he said slowly, “if anything from that night still affects the way you respond to emergencies now. Not to find fault. So that I can write a complete, honest report that will help the review board see you properly — not just as a controller with proper procedures, but as a human being who brings a piece of her own history with her to every shift.”

Boi Thu looked down at the turned off recorder. The small glass surface reflected her face faintly, distorted by the curvature of the plastic layer.

“I don't think it matters,” she said, and as soon as the words left her mouth, she realized it wasn't exactly the truth, just the easiest answer to say in the room.

Khoi did not object. He just nodded, wrote a short line in the notebook, then stood up and packed up the recorder and files.

"Today's work session is enough," he said. "I will need to see you again once I have the results of analyzing the radar data and complete communications records from all three stations. In the meantime, you should complete your psychological evaluation sessions as scheduled."

He walked to the door, then stopped, turning half toward her, a gesture she later recognized as his habit when he wanted to say something outside the official scope of the interview.

"Inspector Ky," he said, "I have investigated more than forty serious incidents in my career. What I have learned is that the best people are not the ones who never hesitate. They are just the ones who have learned not to let hesitation dictate their final actions."

He closed the door, leaving Boi Thu alone in the windowless room, where the sound of the air conditioner was still running, and on the table, the turned off tape recorder still lay there, silent, holding within it a ninety-second audio clip that she knew she would hear many more times before it was all over.

In the hallway, Khoi's footsteps gradually faded away, steadily, without haste, like the footsteps of someone who was used to walking out of the rooms filled with heavy silence that he had just created, not because he was indifferent, but because he knew that silence was sometimes the only tool that made people willing to look directly at what they had avoided for so long.

She sat for a moment longer, without moving, her hands clasped together on the cold wooden table, and in her mind, not the image of Victor Tango two zero five or Seagull zero two appeared anymore, but another radar screen, older, dimmer, in a room eight years and five hundred kilometers ago, where she - then only twenty-six years old - had seen a streak of light that deviated from the expected flight path, and had said nothing.