"So...... You pulled all the cables out of the engine? ”

The old cat nodded.

"Can it still be fixed?"

"I can't."

"And can this rocket still work?"

"I can't."

Tang Yue's eyes were dizzy.

"Old cat, you bastard, I'm going to strangle you!"

"What's exciting? Back off! Don't come near me...... Back off! You've just said that you can't do anything drastic. The old cat waved his paw lightly, "Anyway, it's not a big deal, the downgrade engine can't be used in the first place, if it's broken, it's broken, as long as it's okay to upgrade." ”

Tang Yue breathed a sigh of relief and sat down on the chair.

Just now the old cat told him that it had broken the rocket engine underneath, and at that moment Tang Yue was really frightened, his brain was blank, and his whole body was cold inch by inch.

If the rocket engine breaks, it's all over.

Tang Yue threw the maintenance manual in his hand on the console, covered his face with both hands, and took a deep breath.

"Why did you pull all the cables?"

"Because they're all wrong, they're all in a mess." The old cat replied, "It's not at all as described in the design drawings, some lines are even going in the opposite direction, I don't know who assembled this broken engine, it's your luck that the lander didn't turn into a big firework during landing...... So I just cleaned them all up and sorted out the engine's control system from scratch. ”

Tang Yue was stunned.

"Holy, it's so serious?"

"It's that serious." The old cat nodded, and said solemnly, "Obviously, this assembly worker has a very low level of education, and he can't even understand the most basic drawings, how can SpaceX say that it is also a big group, how can it recruit this kind of person into the workshop...... Wait a minute. ”

The old cat's brows furrowed suddenly, realizing that the problem didn't seem to be so simple.

"What's wrong?" Tang Yue asked.

"Hmm......" the old cat hesitated for a few seconds, "Tang Yue, do you know what 'Occam's razor is?" ”

"O'...... Oo what? Ao What razor? What is this new razor brand? Tang Yue looked dazed, "I've only heard of Philips and Feike." ”

"Occam's razor is an artifact, an artifact for studying problems, and it is a philosophical concept: 'if you don't have to, don't add conditions', which means that when you are studying a problem or putting forward a certain idea, the fewer preconditions and conditions you add, the better, and the more conditions you add, the more likely your point of view is to be untenable." "Occam's razor is used to cut out conditions, to cut out all unnecessary assumptions. ”

Tang Yue thought for a few seconds, "I probably understand what you mean, isn't that so?" If I tell a lie, then I have to tell more lies to fulfill that lie, and in the end the paper can't hold the fire, so I might as well not lie in the first place. ”

"That's kind of a point." The old cat stood on the gangway and nodded.

"But what are you telling me about this?"

Tang Yue didn't know why the old cat suddenly brought up this Occam razor, what does this thing have to do with the current situation?

"Regarding the current engine wiring problem, I think there may be the following factors that have contributed to this result: SpaceX's poor management, the Americans are perfunctory, the assembly workers are too poorly educated to understand the assembly program, the assembly workers drink too much the night before work, and the design drawings are wrong." The old cat paused, "But after careful consideration, I found that using Occam's razor can remove all the above complex assumptions, and get a very concise and clear result, which is the real reason." ”

Tang Yue nodded.

"So what's the real reason?"

"I got the drawing backwards."

·

·

·

Tang Yue sat in the command compartment of the Eagle spacecraft and checked the computer system of the lander in turn according to the maintenance manual.

Navigating ...... Where is the navigation department......"

"Communication, communication channel...... OK。 ”

Tang Yue debugged the buttons on the dashboard, under normal circumstances, these tasks should be done by the commander, who is the driver, and he is just a passenger.

But now that the driver is gone, the passengers can only bite the bullet.

Fortunately, although the lander is complicated, it is a very automated thing, from launch to docking are all covered by the computer itself, Tang Yue only needs to ensure that the program parameters in the computer do not make mistakes, and then press the button, and the Eagle spacecraft can complete all the processes behind.

It's like a fully autonomous car, where the driver only plays an insurance role under normal circumstances, and even if the driver is gone, the car can still be on the road as usual.

If this is a classic car of the last century, from the steering wheel to the brake clutch, someone has to control it, and if the driver faints in the middle of the road, the car will be doomed.

"Docking...... Where is the docking control system? ”

Tang Yue raised his head, opened his eyes and carefully examined the dense buttons on the panel, most of the buttons on the spacecraft were large and conspicuous, this was to prevent people from touching them by mistake, but the number was also dazzling, not to mention that there were various English abbreviations on it, with Tang Yue's English level, he must not be able to recognize it, fortunately there was an instruction manual in his hand, otherwise Tang Yue would be dumbfounded.

“UHF…… UHF？ UHF antenna ......"

"Linear Quadratic Regulator Tree...... LQR-Trees？ There is also a simulation verification process...... Hmmm......"

"Autonomous Orbit Change Control Parameter ......"

Tang Yue checked the maintenance manual in his hand and turned back and forth in the command cabin, surrounded by dense screens and buttons.

"What do you mean by GNC, old cat?"

"Guidance, navigation and control." The old cat replied.

"What about PPL?"

"Pin-point landing, short for precision landing."

“EDL？”

"Entry, descent and landing."

When encountering an English abbreviation that cannot be confirmed, Tang Yue can ask the old cat directly, which is easier than checking the manual, and the old cat can reply in a second, it is indeed a good dictionary.

Although there are more than 10,000 items in the manual, most of them are actually functions that are not used, and most of the manuals are related to manual control.

Since there is no one in the ship's command compartment, the manual control system is naturally useless, and you can't expect the sandwich in the box to climb into the command compartment to pilot the ship.

This part of the system can be shut down before launch, so Tang Yue does not need to check them, which greatly reduces Tang Yue's work intensity, but also shortens the working time, and he can still complete the task within two days in a hurry.

Whether Mai Dong can successfully survive this catastrophe depends on Tang Yue and the old cat.