Mai Dong went to rest after lunch, and the extravehicular work was a very physically demanding job, not to mention that Mai Dong was just a delicate girl.

She had to maintain plenty of physical strength and energy.

Old Cat and Tang Yue began to plan.

"I just got in touch with the system of the Joint Space Station, and the station sent me the self-test report." The old cat opened the report on the computer, and Tang Yue moved a chair over, "The torsional actuator of the S1 battery board is out of order, and the exact reason may be that there is a problem with the light sensor." ”

The main battery board and heat sink on the joint space station are all mounted on the truss, they are not fixed, but will rotate with the angle of sunlight to obtain maximum sunlight illumination, among which the actuator of the battery board guides the direction of the light sensor, which is a gadget, mounted on the battery board.

"The source of the fault is that a control line numbered C1002 has been broken, and it is possible that the wire is broken or falling off, which is not a big problem."

The old cat entered the power system of the Mars United Space Station, and the computer self-test had already given the location of the fault, Tang Yue, as an engineer, saw the cause of the problem at a glance, it was indeed an open circuit, and it was very simple to solve it, just change the wire.

"Was this part designed by the Germans?" Tang Yue asked.

"No, the contractor for the light sensor is a precision instrument company owned by General Electric." The old cat was stunned, "Why are you asking this?" ”

"If it were a German product, then they would definitely dig a hole in the side and bury spare parts for the next 80 years." Tang Yue shrugged.

If it is to eliminate this kind of fault on the ground, it will not take ten minutes before and after, but once the simple operation reaches the orbit, it will become quite tricky, and the extravehicular activities are still a high-risk operation, and the experienced commander is usually responsible for it, and many people cooperate with each other.

Now that Lao Wang and Lao Tang are gone, Mai Dong must shoulder this task alone.

Then Lao Mao and Tang Yue have to make logistical preparations for her.

"The S1 battery pack is here." The old cat clicked on the structure diagram on the computer screen with his paws, "It is the innermost group of solar panels in this row, and it is only thirty-five meters away from the core module of the Crystal. ”

"To replace the circuit, you need to disassemble the shell of the sensor, and the operation is still a bit complicated, so Mai Dong has to bring the repair kit." Tang Yue leaned on the old cat's shoulder and rubbed his chin, "I have done this work before, but it is not the S1 battery pack, it is the S4 battery pack...... You have to use scissors to cut the outer layer of skin, and then there are four No. 3 inner pentagonal screws, and three screws can be removed to open the shell, and one person will definitely be in a hurry to operate. ”

"And that damn electric screwdriver on the space station is very difficult to use, especially when wearing gloves, it is very easy to slip." Tang Yue recalled, "Lao Wang put the strap of the screwdriver on his wrist at that time, otherwise the screwdriver would have flown away." ”

"How long did it take you to replace the sensor?"

"Two and a half hours."

"You make a detailed list of repair steps." The old cat nodded, "We will give priority to repairing the battery panels, and the time for extravehicular activities should not exceed four hours, otherwise Miss Mai Dong's physical strength will not be able to support it, and the inspection of the heat insulation tile of the Eagle spacecraft will be carried out later." ”

Tang Yue pulled out a blank piece of paper and began to follow the memory to list the detailed maintenance steps.

Mai Dong is just a botanist, and he has no experience in repairing the space station, so he must be guided by Tang Yue and the old cat.

The potential of people is really endless, Mai Dong is such a little girl, and now she can go up to the hall and the kitchen, drive the Orion, build the space station, and do any heavy and rough work.

"The whole repair work was divided into three phases, with a maximum of four exits." Tang Yue muttered as he wrote, "The task of going out of the cabin for the first time is to assess the condition and cut the skin material, and this process takes about half an hour...... How long does it take to go back and forth, including going out of the cabin and returning to the cabin, raising and lowering the pressure? ”

The old cat calculated, "Half an hour." ”

"Then this stage will take an hour." Tang Yue tapped the paper with the tip of his pen, "After the completion of this stage of work, the space station enters the far side of Mars, and Mai Dong returns to the space station to rest and prepare to go out of the capsule for the second time. ”

"Did you take a break when you were replacing the sensor?"

"Nope." Tang Yue shook his head, "Lao Wang is a workaholic, we can do it with a flashlight, but Mai Dong can't do it alone, it's easy to have problems due to lack of manpower." ”

The old cat nodded and touched his ears.

"After the sun rises, start the second out of the capsule, the task is to disassemble the sensor shell, remove the C1002 wire, this is a crimson wire, the position is relatively deep, its upper layer has B3074 and B3075 two wires, if you want to replace C1002, you must first remove these two wires, this operation is very troublesome, will consume a lot of time, at this stage can not be in a hurry to replace the wire, all three wires are removed and brought back to the space station."

"This time, Mai Dong had to bring a repair kit...... There's a lot to use, and I'll have to make a list of tools. Tang Yue drew a table on a blank piece of paper, "When operating, the tool must not be lost or forgotten, and as much as you take out, you have to bring back as much as you want." ”

"You'll have to remind her then."

"I'll remind her." Tang Yue pointed to the back of his hand, "Do you know how we used to do it?" We use a small piece of paper to write down all the precautions, then stick them on the back of our hands, and check them one by one after completing the task. ”

"Before the sun sets, Mai Dong must return to the space station, ready for the third mission, this time out of the capsule Mai Dong has to bring spare parts, the spare wires and B3074, B3075 to bring back the sensor, put all the wires on, cover the cover, screw all the screws, so far, the repair work is completed." Tang Yue continued, "In case she can't finish her job when she leaves the cabin for the third time, then she has to go out of the cabin for the fourth time...... Of course, if all goes well, she can complete the mission on the third exit, which is the best. ”

"Is there an emergency plan?"

"If the first time we go out of the capsule to assess the situation, we find that the problem is far more serious than imagined and cannot be repaired, then we will abandon the S1 battery pack, all the action plans will be scrapped, and Mai Dong will return to the space station immediately." Tang Yue replied, "Without the S1 battery panel, the United Space Station can still operate normally." ”

They didn't have any other contingency plans other than strategic abandonment.

Tang Yue pushed the full white paper to the old cat.

The old cat carefully read the table from top to bottom, and did not miss a word.

“OK？”

“OK！”