Chapter 5 — Light Streaks Off The Runway

Junction box number 17 is not located where the current map places it. It was lower, closer to the edge of the drainage ditch and about a body's length away from the marker.

Do not let anyone dig right away. She asked to take the photo as it is, measure from three fixed landmarks, and then remove the lid. Ho Boi Lan placed three white-painted stakes and used a tape measure to connect them to form a triangle. Uyen writes the relative coordinates into the table. Kha stood far away from the inspection area, preventing the maintenance vehicle from passing even though he himself had to explain to the chief driver.

“If we don't let the car pass, the cold storage will be late,” Kha said.

“If we let the car pass, we will lose track of the ground before measuring.”

“Are you talking to me or to the store?”

“Tell the questioner.”

Kha picked up the walkie-talkie and turned towards the warehouse. Five minutes later, he received a sigh from the other end and an “understood”. No one likes a road keeper, but everyone needs someone annoying enough to keep them on track.

Nghi uses a laser distance meter from the first light pole. The number appeared on the screen, Uyen read it again. The error between the current map and the ground is not only thirty-eight centimeters. At the end, the distance accumulated to nearly two meters.

“If each column is a little wrong…” Uyen said.

“Don't draw conclusions before you've finished measuring.”

“I'm thinking.”

"Think about it. Write it down later."

Lan used a bamboo stick to poke the ground around the box. The south is hard, the north is sinking. She moves according to the water line, not according to the drawing line.

“This box used to be lower,” she said.

Nghi knelt down. On the body of the box there are two different paint rings. The low ring lies close to the mud, its color has faded. The high ring is a new layer of paint, with the number 17 written in black. There is an arc-shaped scratch between the two rings.

“Someone lifted the box?” Uyen asked.

“Or the ground falls around it,” Lan replied.

Nghi took off his outer gloves and put on a new pair. She opened the lid. Underneath the padding, a bundle of black-coated cables comes from the power cabinet, then divides into short branches. The branch to the last four lights does not have enough slack. One thread is stretched in the direction of the swamp.

Uyen shines a light. “There are brush marks.”

“Record location.”

“Scrub marks on the rope?”

“On the coating and tube walls.”

Nghi took the plastic ruler and did not touch it too hard. Cable still intact. No burning smell, no standing water. But one connector had thin, rust-colored oxidation marks on a knife left in salt for a long time.

Lan said: "During high water season, this box can flood to the bottom."

“The lights are still on,” Uyen said.

“The earth does not ask if the light is on.”

Nghi measures the resistance of each branch according to airport procedures. Index within limits. She repeated using the second device. The result difference is small, not enough to be considered an error. That's the most annoying part: every single measurement is open to interpretation, but when juxtaposed with the box position, the rut marks, and the image of the row of lights, they're no longer separate things.

Go to the middle of the session. He looked at the cable, then at the clock.

“Is there a reason yet?”

“There are signs that the junction box and light mark are no longer in the correct relative position.”

“I asked the reason.”

“There is not enough data to say whether it is an epidemic or an epidemic.”

“So what do we know?”

Nghi pointed to the cable. “The circuit is still alive. The box shows signs of moisture. The cable route is pulled out of place. The end light looks intermittent from some angles.”

Tong exhaled. “I need a sentence to put in the afternoon report.”

“Write down these four sentences correctly.”

“A report is not a field book.”

“If we reduce it to ‘operational system,’ the reader won't know what we tested.”

Tong squatted and looked into the box. He did not touch the wire. “The box can be replaced immediately Are not?"

“Not if we don't know what force the cable line is holding. Removing it may break the branch.”

“Can the box be rebuilt to its original mark?”

"Are not. The old mold may have been wrong.”

“So what is forty-eight hours for?”

Nghi looked at him. “To prove we need more than forty-eight hours.”

Tong did not answer. He stood up and walked away from the rope area.

Uyen is still looking at the box. "Miss Nghi, why does the board know there is a line but doesn't know the line is pulled?"

“Because the board only knows that electricity is passing through. It doesn't know geography.”

“If so, why doesn't the system have a location sensor?”

“Because when designing, people assume the box and lamp are stationary.”

“The device can assume?”

“The designer assumes. The device just follows.”

Kha called through the walkie-talkie. There is a convoy of vehicles carrying equipment from cold storage preparing to pass. Nghi asked for another ten minutes. The coordinator asked who was responsible if he was late. Kha looked at Nghi. She replied: "The name of the person requesting the check is me."

Kha passed it on. The convoy is waiting.

Lan took an old piece of plastic from her bag and placed it next to the box. “I found this in the north ditch yesterday.”

It's a cable marker cap, with the letters W-3 but the arrow number points in a different direction than the current map. The plastic surface is scratched, but there is still a layer of red paint.

Doubt matches the mark on the box. The old direction went around the subsidence area, then turned back. The current route on the map runs straight.

“The current map may have been redrawn after the route change,” Uyen said.

“And the box location hasn't been updated yet.”

“So the fault lies with the artist?”

“The error lies in the distance between the drawing and the scene. The drafter, the reviewer, the constructor and the map user can all play a part.”

Uyen bowed her head. “If you say that, then no one will be responsible.”

"Opposite. When we know how the gap is formed, we will know who has to fix which part.”

Nghi told everyone to temporarily close the box and not change the status quo. She posted an inspection seal, clearly stating the date, time and names of people present. The signature confirms that the matter has not been corrected. Kha opened the way for the convoy after receiving the notice.

On the way home, Uyen asked: "Do you think you will have to replace the entire circuit?"

"Maybe."

“If so, will the airport be closed?”

"Maybe."

“Whatever you say is possible.”

Nghi looked out at the salty grass on both sides of the road. “Because there is currently not enough data.”

Uyen folded the notepad. “I want you to say for sure once.”

“I'm sure of one thing.”

“What?”

“Don't call a system safe just because it hasn't hurt anyone yet.”

Box number 17 is behind the reflective wire. Electricity still flows through it. But from that day on, no one looked at the green color on the board and thought they had seen the whole truth.

The following night, Nghi requested an electrical test in a closed room, unrelated to mining. She placed the diagram of each branch on the table, numbering the wires according to the actual location, not according to the current map. Uyen reads the code, Kha checks the region lock, Lan compares the pile. Tong did not participate in the operation, but sat at the door to know what effect each step could have.

Nghi runs low load and then gradually raises it. The W-3 circuit is fine. She intentionally disconnected branch 17D, recording the board response. Then reconnect, check the turn-on time. Each test has a condition, a clicker, a reader, and an endorser.

Uyen asked: "If you only need to replace the box, why try the whole branch?"

“Because the box is in the middle of the route. One broken point can make us think we have fixed the whole thing.”

“What if the cable is pulled without breaking?”

“It can change the way it interacts with the background, water or heat changes.”

“It means that today's numbers cannot predict tomorrow.”

"Correct."

Kha stood outside listening and said: "The airport works with too many things that refuse to stand still."

Lan replied: "Land, water and people are all the same."

Tong asked Nghi about the cost of additional measurements. She gave me a sign with both working hours and vehicle restriction time. Read it, then cross the line to buy an additional device you don't need right away.

“This can be removed,” he said.

“If omitted, the error increases.”

“Replacement equipment is available.”

“Replacement equipment is in cold storage.”

“Move on.”

“It takes two hours.”

Tong looked at the board. “Then record two hours. Don't list the need for new equipment if we can move it.”

Suspected correction. She began to understand that Tong was not someone who just wanted to cut checks; he wanted to turn every request into calendars and people, so that there wouldn't be an unlimited expenditure.

When the test session ended, Uyen discovered that the image of box number 17 in her camera had a streak of light reflecting off the water. She was afraid that he had done the wrong analysis and wanted to delete it.

Doubt prevents. “Do not delete.”

“It causes interference.”

“Note that the image has reflections. Create a copy for analysis, keep the original.”

“What if you read it wrong?”

“Explain clearly.”

Uyen created two folders. Original and processed version. She put a yellow note, not changing the photo. Nghi looked at her actions and saw that an apprentice had begun to think like a data keeper.

The next morning, Han asked for the results. Do not say "error box". She said: "Box number 17 has moisture marks, the cable line is pulled, the site landmarks do not match the map, the electricity index is within limits, photos from many angles show the light streaks are skewed. The cause needs further examination.”

Han asked: “If I have to brief the crew?”

“Say there are geometric irregularities that need to be evaluated; no confirmation of night exploitation.”

Han wrote in the notebook.

Tong listened to the call and did not object. He asked Han if he could send a document confirming the company received the data. Han replied yes.

In the afternoon, Vuc came to look at the box. He did not ask to enter the sealed area. Standing outside the wire, he only said that the old cable route used to run around to the north. Lan asked if he had the drawings.

“In stock.”

“Take it out,” Nghi said.

Vuc looked at her, then nodded. “I will take it.”

When he left, Uyen asked: "Do you believe the map he gave you?"

“Believe he kept it. How accurate it is remains to be measured.”

“You don't trust people?”

“Trusting people is one thing. Using the data maker's words is another matter."

At night, Nghi passed through the reflective area. Box number 17 is covered with a protective plate, but the seal is intact. The last four lights are off. She heard Kha announce that a car had stopped at the right mark. Listen to Lan say the water level. Listen to Duy confirm the tower is not approached.

People begin to create a safe distance around the problem. That distance does not make the error disappear, but makes it impossible for anyone to touch it with the hands and memory of a single person.

Nghi closed the book with a new line: “The W-3 circuit does not meet the conditions to be called geometrically stable; Continue controlled testing.”

This time, the word “not yet” no longer sounds like a delay. It is a state with an update date.