Chapter 116 Dangerous! Unloading the flaps(3/3)
This means that the aircraft can theoretically get off faster. However, since there is still terrain below, too fast descent will produce an excessive approach rate, which can easily cause terrain warnings.
I have calculated it on the ground yesterday. As long as I can descend according to the scheduled plan, although it is a bit thrilling, I can still successfully intercept the downward duct.
After the plane started to turn to the five sides, it is logical that VOR/LOC should be pressed to intercept the course. However, in order to have more time to decrease, Instructor Zhang did not intercept the course nor did he continue to maintain horizontal navigation, but instead
Switch the roll mode for heading selection.
First, he turned his course twenty degrees right. When the plane was about to turn to the scheduled course, he turned the course knob to the place twenty degrees on the left side of the course. In this way, the plane began to turn to the left again, and back and forth.
This forms an S-shaped curve with the heading lane as the center line. In this way, the range of the aircraft will be increased to obtain a longer descent time, and it can be roughly maintained on the heading lane, and can be corrected at any time to intercept the heading lane.
.
This is a small trick to use when the five sides are too high, but this time I used it.
Yesterday, Zeng Wei calculated a rough downward profile for them. The three people in the cabin were calculating silently. Fortunately, the height was not much different from the calculation on the ground, which means there was no problem with the plan.
of.
The three of them couldn't help but breathe a sigh of relief. Finally, they did not encounter unpredictable problems before landing.
However, after the plane descended to the final approach positioning point, Instructor Zhang immediately adjusted the altitude to 7,300 feet, which is the value of the blind descent of Runway 21 to round up.
In addition, the descent rate decreased from 2,000 feet to 1,500 feet, while still allowing the aircraft to keep the S-shaped curve flying around the course.
In theory, the aircraft can maintain a descent rate of 2,000, and it should be no problem to reduce it to 1,500 feet later. However, after the aircraft goes down to a lower point, as the air density increases, the aerodynamic performance of the aircraft
It is also increasing. Even when the thrust of the two engines is reduced to slow down, the aircraft begins to be unable to maintain speed under the descent rate of 1,500 feet per minute.
At first, Lu Jinghua just felt that the speed of the plane was rising due to the temporary turbulence. But after waiting for a while, the airflow stabilized and the plane stopped bumping. The airspeed did not fall back at all, but continued to maintain the reference speed.
The appearance of ten verses.
If the aircraft can maintain this speed, it will be barely acceptable even if it is a little larger. However, the sustainability of the airspeed has caused Lu Jinghua to feel a little uneasy.
Wang Xuan, who was a little relaxed just now, also looked cold and the situation seemed not very good.
The moment Wuhaili reported the tower and obtained the landing permission, the airspeed, which had been stable at the reference speed and ten knots, suddenly began to rise slowly. Now all the three people in the cockpit changed their faces suddenly.
"The plane can't get off!" Lu Jinghua shouted softly.
The V/S method of descent is preferred to ensure the descent rate, but if the descent rate exceeds the maximum descent rate that the aircraft can provide under slow thrust, the aircraft's speed will increase as a result, which is inevitable.
Seeing that the aircraft speed has exceeded the reference speed and 15, this is obviously much higher than the predetermined approach speed.
Wang Xuan's face was anxious. Now that the speed reduction board has been put down, the accelerator has been closed, the landing gear has been put down, and all the descent methods have been used, they have no choice but to do anything.
"What should I do?" Wang Xuan's face was as deep as water, and his heart cried wildly. Such a major task was frustrated, but he was extremely unwilling to accept it.
"It's okay, just keep the descent rate like this, and it has not reached the limit speed yet." Instructor Zhang gritted his teeth and suddenly said: "When the glide passage is intercepted, the plane can slow down."
At this time, the three people in the cockpit could even clearly see the cracked runway at Yulong Airport. The destination was close to you, and no one was willing to give up.
Lu Jinghua's mind was running rapidly. He did not immediately reject Teacher Zhang's proposal. Indeed, there was still a little extra effort in airspeed, so he could still let it increase.
However, even if the glide passage is intercepted, the descent rate can be reduced. Can the aircraft really reduce the speed back?
However, just as Lu Jinghua was hesitating, he suddenly felt that the plane seemed to rise slightly, and the change in state was slight, and even Instructor Zhang did not notice it.
However, Lu Jinghua's face turned pale: "No, the flap is unloaded!"
Chapter completed!