198: Chapter 19 The Ten Thousand Hours

The second month of the sixth year of the current cycle.

In front of the H-01 maintenance bay, the shattered outer ring of the reducer was still lying in the oil drip pan.

Jiang Lin pieced the last fracture back into place, reconstructing the direction of the force during the fall along the extrusion marks on the metal.

The crack originated from the edge of the raceway, first torn open by the impact when the left rear foot fell into a crevice, and then expanded by fourteen millimeters during the lateral drag of the companion rescue.

This was field damage that exceeded the design envelope; replaced on any machine of the same specification, the result would not have been any more respectable.

H-01's primary load-bearing frame, joint casing, and the other five mechanical feet passed re-inspection. The left rear foot assembly was replaced entirely, while for the left middle foot pressure array, only the two damaged layers of sensor chips were replaced.

After the seventy-two-hour requalification ended, it rejoined the northern work crew.

Seventeen replacement part numbers, four sets of calibration curves, and a fracture analysis were added to the maintenance records, and the mission status returned from red to green.

Jiang Lin signed his name in the release column, thinking this accident had been settled.

One thousand eight hundred and forty-six hours later, H-01's left rear foot lost its signal for forty-three milliseconds on a testing path so flat it was almost boring.

At that time, five machines were dragging a set of dummy loads past the southern annular passage of the Outpost. The ground was flat, the temperature was twenty-one degrees Celsius, and it was more than two hundred meters away from the nearest crushed stone slab.

The left rear foot pressure reading first dropped to zero, and the joint encoder subsequently disappeared from the bus. H-01 immediately handed the operating load over to H-02, lowering its own fuselage and stopping at the edge of the passage.

Forty-three milliseconds was very short—so short that by the time a person blinked once, it had already passed five or six times over.

For a walking scout aircraft, it would only leave a footing point that needed re-testing; for a transport aircraft dragging a power module, it was enough to make the contactor trip. Falling on H-01, the force-controlled operation cabin had to freeze several thousand Newtons of external load in place, waiting for another machine to take over.

The same kind of fault, when changing positions, changed into a new way of causing trouble.

The work crew recovered H-01 according to the established protocol, and the remaining four machines finished walking through the annular passage with the dummy loads.

Jiang Lin mounted the left rear foot assembly onto the test rig, continuously bending, heating, cooling, and loading it for six days, but those forty-three milliseconds never appeared again.

The encoder was normal, the pressure array was normal, and the contact resistance of the connector also stayed within the acceptable range.

In the early morning of the seventh day, he turned the test rig to H-01's joint posture at that time, and then let the wire harness twist outward by 3.2 degrees under load.

The differential signal on the oscilloscope cut out for forty-one milliseconds.

Jiang Lin fixed the posture and slowly pulled the wire harness out of the corrugated sheath piece by piece.

At a position forty-seven millimeters near the tail of the connector, the outer insulation was still intact, but one of the internal conductors had nine strands of copper wire broken, and the remaining copper wires only made contact at a specific twisting angle.

This wire harness used the same blueprint as H-02; the conductor cross-sectional area, insulation thickness, connector model, and incoming inspection results were all identical.

Placed together, the two wire harnesses differed in length by only 1.6 millimeters, and the positions of the fixing clips were also within the plus or minus 2-millimeter range allowed by the blueprint.

The difference was hidden in the maintenance process.

When replacing H-01's left rear foot, Jiang Lin took one roll from two rolls of inventory wire, and left an extra finger's width of allowance for the corrugated sheath behind the connector.

The blueprint allowed for this allowance, and the inspection procedures permitted it too. But after being reinstalled into the fuselage, it pushed the position of repeated bending from the middle of the sheath to the root of the crimped end.

Jiang Lin flipped to the maintenance records from over 1,800 hours ago.

The records stated wire harness replacement, insulation test passed, bus verification passed, and whole-machine calibration passed. Which roll the wire used came from, which pair of jaws the crimping pliers were, and which side of the tolerance band the fixing clip was finally locked on—all of it remained in his hands and memory.

More than six years of life in the Wasteland had ground that afternoon down until only a qualification form was left.

He remembered repairing this machine, but could no longer recall whether he had picked up that roll of black wire from the left or the right at that time.

A process that relied on the assembler remembering every knuckle, every retraction of the hand, and every bit of tactile feel could, at most, only replicate another assembler themselves.

Jiang Lin changed H-01's release status back to red, and pulled all three machines that had their wire harnesses replaced in the same batch out of the task queue.

The cumulative operating timer on the south side of the Outpost stopped at 19,731 hours.

The mileage that had already been steadily traversed still belonged to test evidence, but the current qualifications of the three machines had to be re-established from the maintenance node.

The complete maintenance index of OUTER CACHE-07 cataloged more than 4,000 types of flexible wire harness failures, and the conductors, insulation layers, connectors, and automatic routing equipment used mostly exceeded the manufacturing scope of 2022.

None of the lifespan numbers among them could be used directly; what Jiang Lin retrieved were failure records related to the neutral bending axis, crimp end strain, fixation point migration, and post-maintenance rerouting.

Future records pointed out to him where mines had been buried before, but when those mines would detonate on the wires in his own hands still had to be stepped on from the beginning.

Twelve sets of parallel bending racks were quickly erected on the east side of the assembly room.

Forty-eight wire harnesses made according to the same blueprint were divided into six groups. The wire materials were taken from different inventory batches, while the crimping height, stripping length, sheath allowance, and fixing clip positions respectively fell into different areas of the allowable tolerance band.

Hanging next to each wire harness was a palm-sized gray label.

The front of the label only had the serial number, while the back recorded the material batch, blanking equipment, crimping jaws, crimping height, pull-off test, assembly path, fixation point coordinates, and operation time.

Jiang Lin sealed the 3D scan, power-on curves, and insulation data upon completion of installation into the serial number; any disassembly would generate a new maintenance version.

The first batch of samples broke after 41,000 cycles of compound bending.

The second batch reached 270,000 cycles, and the contact resistance at the tail of the connector began to fluctuate with temperature.

The longest-lived one could still work after surpassing 1.8 million cycles. It used the same roll of wire as the earliest failing one, except that the fixation point behind the crimp end was shifted outward by 3.5 millimeters.

All samples passed the original incoming material inspection, and all assembly dimensions fell within the range allowed by the blueprint.

Stacking every passed item together, the system could still end up with a wire harness whose lifespan was only one-fortieth of the longest-lived sample in the same group.

Jiang Lin reallocated the interface errors.

Simply tightening every tolerance would make the blueprint expensive and difficult to manufacture. Jiang Lin changed the structure of the fixing clip, turning the sheath allowance from the assembler's tactile feel into a fixture limitation, and moved the root of the crimp end out of the active bending zone.

The wire batches could still vary, and the assembly dimensions also retained a range that reality could bear, but the critical force-bearing position no longer wandered around with a few millimeters of error.

After the second round of forty-eight samples entered the bending racks, the earliest failure point was pushed to 930,000 cycles.

H-01's maintenance version was changed from R1 to R2, the old release records were fully retained, and the new qualifications were recalculated from zero hours.

This time, there was no longer that roll of black wire on the qualification form that existed only in Jiang Lin's memory.

In the seventh year of the current cycle, the long-term testing area outside the Outpost expanded to three times its original size.

The crushed stone slope, water accumulation trough, dust corridor, eighth-degree side slope, and communication shielding section were connected together by a closed route. Twelve platforms of different roles were divided into three groups, executing patrol, transportation, energy supply, operation, and companion recovery missions in day-and-night shifts.

After the number of machines increased, new differences crawled out one by one from the gaps in the blueprints.

Two separately qualified task module and chassis interfaces would have an eccentricity of 0.8 millimeters under the most unfavorable tolerance combination; the locking pin could reach its position, but the sealing ring would endure continuous lateral pressure.

After being repaired, a transport aircraft passed static calibration. After running continuously for six hours, the load distribution of the two feet on the right side would still slowly drift higher, finally tracing back to a replaced attitude sensor mounting surface.

The flatness of the mounting surface was qualified, the sensor zero point was qualified, and the chassis geometric calibration was also qualified. Combining three respective pretty reports happened to push the zero point to the edge of the task-allowable interval.

If the same machine only carried a relay module, the deviation would be swallowed by the gait control; but upon replacing it with a four-hundred-kilogram power module, the temperature rise of the right reducer would be 6.1 degrees Celsius higher after four hours.

Jiang Lin stopped organizing faults by part names, and instead recorded which type of mission each deviation ultimately harmed.

Sporadic wire harness disconnections would make the scout aircraft lose a section of its route, cause the power module to cut off power supply, and force the manipulator to hand over the load in its grasp.

Interface eccentricity would shorten seal life, increase the insertion and extraction force of the task module, and might also add an undeclared lateral force to the rescue module during lateral towing.

Post-maintenance requalification was thus divided into chassis common items and role-specific mission items. Machines that had replaced the same component had to walk different test routes depending on their next job.

From then on, a machine no longer had only a factory serial number.

Which batch of materials it had used, which workstation and set of operating procedures it had passed through, on which fixture it was closed, what any given repair had changed, and why it still qualified to enter the hazardous zone right now—all of it grew backward along with the serial number.

Jiang Lin called this record a process passport.

The name sounded very light, but the actual content grew faster than the machine itself.

By the end of the eighth year, the passports for the earliest batch of test platforms already had over seventy thousand records, ranging from major events like joint replacements to minor issues such as a connector retaining 0.4 Newtons of extra locking force after being plugged in and unplugged three times.

MPS-Agent α was responsible for clustering anomalies into candidate failure chains, and Jiang Lin only handled the parts that would change lifespan, missions, and clearance boundaries.

Records that were temporarily unused remained in the passports, waiting for future failures to come back and find them.

The Outpost's original monthly production capacity projection was also redone based on this chain of evidence.

Jiang Lin first simulated an assembly pace of six units per month based on the equipment and stations of the second delivery unit in reality.

At six units, a single set of geometric calibration and whole-machine environmental testing could still keep up with assembly, and there was also space to take apart repaired machines.

When the target was raised to eighteen units, the assembly stations would be piled with semi-finished products in the first half of the month, but in the second half, eleven machines would be blocked outside the calibration stations all at once.

Continuing to increase assembly personnel would only make the queue waiting for calibration line up more neatly.

Jiang Lin added the second calibration chain, independent repair station, and module task bay parallel testing to the master version, and only then was the pace of eighteen units closed for the first time.

Thirty-six units pushed the problems further to incoming material reinspection, environmental testing, and long-term sampling inspection. If any place still relied on manual transcription, the process passports would develop untraceable blanks within two weeks.

Higher production capacity required a second source of supply, an independent measurement chain, and release authority separated from production. Simply copying workstations could no longer guarantee that the same certificate of conformity still represented the exact same thing.

Four numbers were written by Jiang Lin into different versions of the capacity-expansion master versions.

[Monthly production of 6 units: Unit closure]

[Monthly production of 18 units: Dual calibration chain / Independent repair]

[Monthly production of 36 units: Parallel environment and life sampling inspection / Automatic process evidence retention]

[Higher scale: Second-source equivalence verification / Independent release system]

The column for the second source remained blank.

The Wasteland inventory could provide him with materials and components from different batches, but it could not replace the supplier factories of 2022, process changes, and the real samples delivered to the low-entropy doorstep.

What Jiang Lin left behind was a set of methods to prove that the two sources were sufficiently equivalent. As for which specific one could pass, they would have to let the physical objects speak for themselves after returning to reality.

From the ninth year to the eleventh year, the cumulative operating time of the machines in the test area crossed from forty thousand hours to over eighty thousand hours.

The bending frame had its bearings replaced three times, the waterproof layer at the bottom of the drainage trough was patched four times, and the recovery fan in the dust gallery was changed from being cleaned once a day at first to having its filter bags automatically replaced by the transporter based on pressure differential.

By day, Jiang Lin processed tests and archive translations; by night, he spread three number-domain failure drafts across the other side of the workbench, letting the sound of the machine's footsteps through two walls accompany those point sets that could never squeeze out a fixed exponent as they continued to fail.

Most of his birthdays in his twenties passed amidst this sound.

In the first few years, he would personally move the task module weighing over sixty kilograms from the assembly rack to the transport vehicle. By the eleventh year of this cycle, the exact same action would cause his lower back to settle accounts down to the last penny the next morning.

Thirty was far from being old age, it was just that the physical strength he could casually squander at eighteen had now begun to demand an explanation of its usage from him.

A low-level suspension rail was added to the assembly room, and the heavy-duty platform also received a set of handling clamps.

Jiang Lin was responsible for confirming the interfaces and stress points, while the job of lifting the task module was left to the machine.

That winter, G-Explorer-C received a full-lifespan requalification notice.

It had just been sent back from OUTER CACHE-07 with the nineteenth batch of storage repair modules. Its right casing was stained with white deposits from the maintenance gallery, and the old scratch on its belly still extended all the way from the front end to right beside the task interface.

Combined with the previous two rounds of trips into the Wasteland, its service span was approaching nearly one hundred years.

During this time, all six mechanical legs had been replaced more than once, and the batteries, controllers, sensors, and seals had also undergone several rounds of updates, but that earliest central load-bearing frame and casing had been retained to this day.

Jiang Lin connected it into the new process passport system, merging the old logs sequentially from three Outpost versions, two sets of storage media, and dozens of paper maintenance manuals.

Battery replacements, foot-end wear, evacuation from old cracks, passing under isolation doors, OUTER CACHE-07 integration, force-controlled operation cabin tests, and rescue by the northern work crew—one by one, they returned to the exact same timeline.

Its passport covered every single year sufficient to affect lifespan judgments.

Functional tests still passed, and its six-foot pressure, braking distance, communication, and task interfaces all remained within the current boundaries.

However, the third nondestructive testing of the central load-bearing frame found two short cracks on the inner side of the right rear towing ring.

The longer one was only 3.7 millimeters, and the current static load test still had a margin, but its location coincided with the stress concentration left by the past three heavy-duty towing operations.

Continuing to use it meant either replacing the central load-bearing frame or reducing the task payload to give it another new period of service.

The former approach would dismantle the last main structure on the body that had run through nearly a hundred years of missions, while the latter approach would require reserving a special exception rule exclusively for an old machine that exceeded its lifespan master version.

Jiang Lin sat beside the reinspection platform for a long time, marking monitoring indicators at both ends of the cracks respectively.

There were a total of three release options on the terminal.

[Replace central load-bearing frame / Rebuild qualifications]

[Restrict payload / Conditional service]

[Withdraw from frontline / Full-lifespan sample archiving]

He chose the third item.

Relying on its own power, G-Explorer-C walked down the reinspection platform and entered the northern reference position along the centerline of the assembly room.

Originally, foot-end samples of the first-generation G-Explorer-A and two scrapped terrain plates were stored there. Now, a complete platform had been cleared out, and the power supply, communication, and structural monitoring interfaces were all connected.

Jiang Lin removed the task module from its back, removed the hazardous area permissions from the controller, and retained only low-speed movement, status review, and teaching verification functions.

The fuselage status changed immediately.

[G-Explorer-C]

[Mission qualification: Revoked]

[Asset status: Full-lifespan reference platform]

[Disassembly permission: Frozen]

Those two cracks under 3.7 millimeters, nearly a hundred years of parts replacement records, and the stress history left by every mission became the most complete set of answers in the new lifespan master version.

Jiang Lin also scanned the old scratch on the belly into the 3D archive, and then closed the guardrail of the reference position.

The test area had one less machine that could still walk.

Consequently, the multi-machine cumulative operation timing lost a scheduled input, and the date of crossing one hundred thousand hours was delayed backward by nineteen days.

In the fourth month of the twelfth year, at 2:16 AM, three unmanned operation crews were running simultaneously in the field.

The first group passed through the dust gallery, the second group replaced relay nodes in the drainage trough, and the third group dragged a faulty platform with its right front foot intentionally locked back to the safety line.

Jiang Lin slept in the small room on the east side of the Outpost, where the bedside terminal retained only four types of alarms: shutdown, fire, leakage, and personnel risk.

When the cumulative duration jumped from 99,999.9 to the next tick, none of them required waking him up.

At 2:22 AM, the third group completed companion recovery, the faulty platform's process passport automatically entered the maintenance version, and the other four machines continued executing their remaining tasks.

The system total timing was updated.

[Multi-machine system cumulative qualified operation duration: 100000.0 h]

[Full-lifespan failure spectrum: Version 1.0]

[Task module interface standard: Version 1.0]

[Digital process passport: Continuous]

[Post-maintenance requalification verification: Passed]

[Capacity expansion master version: Four-stage closure]

The next morning, Jiang Lin walked into the control room holding a cup of warm water, and the one hundred thousand hours had already advanced by another 6.4 hours.

That integer occupied only one line in the logs, and the three groups of machines were still handing over routes, supplies, and faulty platforms.

He spot-checked the task records before and after the crossing node, and deleted a default option from the second-source verification master version that would mistakenly treat inventory batches as real supplier qualifications.

Thus, the document left its final clear blank.

[Specific second supply source: Pending verification by real samples]

Jiang Lin signed and issued the A11 engineering package, splitting the release authority from his personal signature into four independently traceable evidence chains: measurement, process, whole machine, and task qualification.

[A11 / Digital process passport and supply source equivalence verification]

[Multi-machine full-lifespan sample: 100000h]

[Real material mapping: Completed]

[Applicable boundary: Unmanned operation system in low-speed, high-risk environments]

At noon, a new heavy-duty platform delivered the joint box to be assembled to the side of the workbench. The sixty-seven-kilogram wooden box was twenty centimeters off the ground, falling right into the pickup range of the low-level suspension rail.

Jiang Lin held the corner of the box, unbuckled the securing strap, and let the suspension rail take over the weight.

When the transporter passed in front of the northern reference position, G-Explorer-C's low-power status light continued to blink on and off according to its original cycle.

Its task timing stopped on the day of [Qualification Revoked].

Beneath it, the work crew's cumulative operation duration jumped from 100,006.4 to 100,006.5.