At first there was nothing unusual to report. The frequency traces remained within expected ranges, temperature monitors behaved normally, and the sensors mounted near the actuator bracket recorded small fluctuations consistent with earlier developmental runs. Wesley watched the numbers while the machine transmitted its relentless motion through the test fixture. The prototype itself appeared motionless from beyond the safety glass, but the graphs told the story of forces being repeated thousands upon thousands of times.
About twelve hours into the run, Wesley heard a faint metallic tick through the monitoring equipment. It was not loud, and it did not trip the automatic shutdown system. He reviewed the sensor history and found a slight change in the local response near the tail assembly, small enough to be ambiguous. A properly documented test might continue through harmless noise, but the unverified batch number on the transfer sheet made the sound difficult to dismiss.
He sent a note to the engineering desk and requested a review of the assembly record. An engineer on duty said the executive release had already cleared the configuration. Wesley replied that the release did not answer his specific question about material traceability. When he contacted Preston, the chief operating officer asked whether any limit had been exceeded. Wesley said not yet, and Preston told him to continue.
"We're not restarting a thirty-six-hour test every time somebody hears a noise," Preston said. "You're running a laboratory, Wesley. Not conducting a séance."
Wesley ended the call without answering the insult. He activated an additional review of the camera feed within the existing surveillance setup and instructed the night crew to mark any change in the local measurements. The high-speed camera captured images too fast for a human observer to interpret in real time, but its recordings could be examined afterward. Wesley saved a reference point at the moment he first heard the sound, knowing he might later need to distinguish an early warning from an unrelated laboratory vibration.
Laurel stopped by the observation room near the end of the twelfth hour. She had dark circles beneath her eyes and still carried the original specification binder. Wesley showed her the handwritten batch correction and the note about the tick. She looked at the sheet for several seconds, then asked whether Preston had been told about the sound. Wesley said yes. She asked what he had said, and Wesley answered with a weary look that told her almost everything before he spoke.
"He wants the clock to keep running," Wesley said. "If I trip an equipment safety limit, I shut it down. But I need engineering to tell me whether we're testing an approved configuration, and nobody will put that determination on a signed page."
Laurel opened her binder to Mason's material requirement. She knew exactly what the page established, and for a moment she stood with her thumb resting along the edge as if she could conceal it from herself. Then she told Wesley the substituted bolt had never been qualified. She said she had raised the issue but had not received authorization to change the assembly back to the specified part.
"That should be in the test exception record," he said.