"What is this?" Because Qianyu is not tall enough, he can only observe those particles from the relatively thick bottom of the cup. "It doesn't look like it's a piece of an airplane." (Generally speaking, the fragments are long, narrow in shape, otherwise it is almost impossible to break them.) ）

"Pebbles?" The captain was uncertain. "But even if it's a pebble, it's a little too small, isn't it?"

"Gravel?" Conan is also not confirmed.

"Not exactly," the boy glanced at Conan and Chiha, smiling as he lowered the cup to a level they could see. "I think the most correct way to say it would be – volcanic rock."

"Huh?" Thousand Feathers was stunned.

"Volcanic rock?" The co-pilot was surprised.

"You mean..." Conan probably had the answer in mind.

"We have limited time, so do as I say," the teenager motioned for the captain and co-pilot to return to their seats. "Immediately descended, until now the situation where this particle hits the cockpit glass is over."

"If we go down, we'll make a crash landing on the surface of the sea faster!" The captain frowned, but still sat in his seat with the co-pilot. "I'll give you a minute to convince me."

"We are flying in volcanic ash," the teenager sighed and explained. "The dust in the ash was sucked in by the engine, causing the entire engine to be clogged! As for the evidence, there was no reaction on the weather radar. ”

"What's the reason for that?" Although the captain had fallen into deep thought, the co-pilot did not buy it.

"Weather radar," the boy tapped on the radar screen. "Its detection principle is to detect water droplets in clouds as a way to mark the height and position of the clouds. But if there are no water droplets in the clouds, then there is nothing it can do. For example, the volcanic ash cloud I just talked about, it contains calcium oxide, which reacts with water to produce mature lime, so there is absolutely no moisture in this cloud. ”

"First Officer, descend." After listening to this, the captain expressed his attitude with his own instructions.

"Captain!" The co-pilot hurriedly dissuaded.

"I'm afraid he's right," the captain shook his head. "Do you remember those Indian dumb pigs who couldn't understand what we were saying? It's all because the ash rubs against our planes, creating static electricity — that is, flashes on the engines — that interferes with our communications systems. But, little one, what to do with the engine? Even if we were able to get out of this ash cloud, we wouldn't have enough speed to get back to land. ”

"So when we don't have more rocks on our windows, and when we get out of the ash clouds, we're going to move on to the next step, now we're going to descend first, the engine... Leave him alone until you leave the ash cloud. ”

"Let's talk about what we're going to do," the captain said helplessly. "If you give the order after you have escaped, there may not be enough time."

"What is our speed?" The boy looked at the captain's airspeed counter. "330 miles?"

"330 miles?" The co-pilot was stunned, then looked at his airspeed counter again. "I'm going 280 miles here!"

"What?" The boy hurriedly came to the airspeed of the co-pilot, and sure enough, he saw that the airspeed of the captain and the co-pilot were as different as 50 miles per hour. "That's the problem..."

"yes," the captain said solemnly. "It's a big problem."

"Excuse me," Conan said, confused. "What's wrong?"

"As a large airliner, you can only start the engine successfully when the speed is in a small range," the teenager replied. "The plane starts at 250 to 270 miles, and the trouble is, there's no way to know which airspeed is good, so there's no way to confirm the speed."

"Let's not talk about this yet," Qian Yu suddenly thought of something. "Since the engine is blocked, we won't be able to start the damaged engine even if we leave the ash cloud!"

"Yes," the boy smiled. "The engine gets clogged because the temperature of the engine is up to 2,000 degrees Celsius, which allows the ash to melt and flow into the engine. Once the ash is not heated by the engine's heating part, it resolidifies into a viscous form between solid and liquid, clogging the engine. Halfway through the blockage, there will be the flashback we saw earlier, and when the blockage is complete, the flame will go out. ”

"However, if the ash is completely solidified, most of the ash will fall naturally due to various forces, and the engine will be able to run when it is separated from the engine."

"So, we're cooling the ash right now?" Conan raised an eyebrow.

"No, no, no," the boy shook his head. "The cooling process isn't as slow as you think, especially since our planes are so fast and can be cooled down to the extent we need it very quickly. Now my plan is to make sure which airspeed is correct. ”

"How can you be sure?" The captain asked. "We don't have any other velocity measuring instruments, do we?"

"The law of conservation of energy," the teenager shrugged. "The amount of change in kinetic energy = the amount of change in potential energy - the amount of work done by air resistance, and the rest is almost negligible. The nose is pulled down five degrees, the ailerons are pulled up to full, and I need thirty seconds to give an answer. ”

So, in the next tens of seconds, the captain pulled the nose of the plane to the angle requested by the teenager, and the teenager stood behind the captain, silently looking at the altimeter.

"Just as I guessed," the boy said with a sudden look of relief. "The captain's table should be more accurate."

"Guess what?" The technician was surprised. "My sense is that the captain's watch is correct, but how did you guess?"

"If the speed is really that slow at 280 miles, when I came in just now, the plane would definitely not be traveling at more than 290 miles per hour, and the length of the flames of the backfire would definitely not be that long, and the length of the backfire just now would probably be more than 30 yards."

"We're out," the captain reminded them that the plane was out of range of the ash cloud. "What's next? Slow down? ”

"Stay at this height," the teenager said decisively. "Don't slow down, fly level, let the speed drop naturally, and now you can start preparing to restart the engine. The speed of initiation is three minutes, and you have six or seven chances, otherwise we will feed the fish. ”

"It's 330 miles now, can you start now?" The captain was slightly stunned.

"I didn't say your watch must be accurate," the boy said speechlessly. "It's just that the co-pilot's speed is obviously too slow, so we have to try slowly."

"Understood," the captain nodded. "Prepare to execute the engine ignition procedure!"