"Blue 9846, lower height 3600, you can turn right to report!" Approach Control Command Road.

Xu Qing and the others had already passed through the five sides, and they had to turn right to re-cut back to the fairway, so the approach control asked Xu Qing and them to turn right to report.

"Under height 3600, you can turn right to report! Blue 9846. "At the same time, a signal was given to the cabin, this signal was made with the cabin crew when preparing for the flight, as long as this signal was played, all the flight attendants must stop the service and do a good job in their own positions, of course, this height, close to landing, the general flight attendants will not leave the position.

The bump became a little lighter after passing through the five sides, but the automatic driving still couldn't be connected, and he asked the captain if he wanted to go down the height first.

The minimum safe altitude of 25 nautical miles around the airport in K City is 3,600 meters, that is, as long as it is higher than 3,600 meters, the aircraft can meet the requirements of vertical separation if it can walk within a radius of 25 nautical miles of the airport in K City.

The highest point within a 25-nautical-mile radius of K, on the left side of Runway 21, is a mountain peak. Originally, Xu Qing was on the right side of the five sides of Runway 21, and the clearance conditions on the right side were excellent, and they did not worry about terrain warnings.

If it were normal, I wouldn't have asked this question. Because under normal circumstances, the aircraft can maintain its altitude strictly and there will be no problem of deviating from the altitude.

However, this is no longer the case!

Due to the strong turbulence, they did not dare to guarantee that they would be able to maintain 3,600 meters, and if they flew any further, they would be at the top of the terrain, and it would be quite dangerous to fall below the minimum safe altitude.

Of course, today's visibility is excellent and you can see the ground clearly, but there should be no risk of a controlled flight hitting the ground. However, terrain warnings don't go off until you're about to hit the ground. In the unlikely event that a terrain warning goes off due to deviation from the altitude, it will be another trouble.

The captain nodded, he was still under a lot of pressure, because he was already thinking about whether to stop the approach.

Seeing that the captain agreed, he immediately contacted the approach control: "Blue 9846, we can't maintain the altitude now, so we won't go down to 3,006 to prevent it from falling below the minimum safe altitude." ”

The approach quickly replied: "You can judge the timing of the descent by yourself, and the vicinity is not affected, but can you get down to the height?" ”

If the Blue 9846 maintains a high altitude, then according to the descent plan, their height will appear slightly higher. And the control side can see the airspeed of the blue 9846, and you can judge whether the blue 9846 has a flap from the airspeed.

Now the airspeed of the Blue 9846 fluctuates violently around two hundred and thirty knots, which should be the normal speed in the smooth form. If you don't even put the flaps, it's a bit ridiculously high.

Before waiting for a reply, the captain tried to turn on the autopilot again, this time it was connected, and then replied to the approach: "The altitude is no problem, I can maneuver on the five sides, I can get down." ”

Not long after the captain answered the approach control, Xu Qing felt that the bump was a little lighter. There will be no continuous violent bumps, but a shake or two from time to time, but the amplitude of the bumps is still quite strong.

Seizing this fleeting opportunity, the captain directly followed up with the application for close control: "Blue 9846, apply to turn right, I am now under altitude 3600!" ”

Almost as soon as the approach control agreed to the application, the captain began to turn right, and at the same time, because of the lag of the autothrottle, the captain manually overtook the autothrottle and retracted the throttle, and directly received the slow train. At the same time, the captain checked the speed limit and ordered the first pair to lower the landing gear.

On the one hand, the landing gear is lowered to speed up the descent rate. On the other hand, when the landing gear is lowered, it increases the stability of the aircraft!

To Xu Qing's surprise, as the altitude dropped, the bumps seemed to be significantly smoother. The captain didn't say a word, and directly pulled up the speed brake to slow down first, and they had to put the flaps first.

There is a height limit on the use of the speed brake, and you can't pull the speed brake all the time, Xu Qing's company can't use the speed brake if it's less than 3,000 feet.

Xu Qing and the others pulled the speed brake all the way down, first slowing down and releasing the flaps.

"Blue 9846, apply for a height of 3300!" The captain applied again,

Even if they pulled the speed brake, Xu Qing and they were still on the high side, and they had to continue to descend without the slightest pause. 3,300 meters is the height of the interception glide path, and the captain applies to go directly down to this altitude, and after intercepting the channel, he can quickly intercept the glide path.

"Blue 9846, agree to the height of 3300, you can establish the 21st blind landing by yourself, blind landing report!" Approach control lane.

"Under the height of 3300, you can establish the 21st blind landing, blind landing report!" This is a reply, and the captain is still concentrating on the altitude.

"After a while, we cut into the channel with the navigation selection, first without presetting the VORLOC, after cutting into the channel, maneuver left and right to lower the altitude. We must adhere to the stable approach standard, and if the stable approach standard has not been reached below 1,000 feet, we will return to flying and absolutely not landing, okay! "The captain and Xu Qingdao, stable approach is a red line, and it must not be touched.

Of course, Yiyi and Xu Qing know the seriousness of the stable approach, and they don't need the captain, as long as they don't meet the criteria for a stable approach, they will decisively call for a go-around.

Now Xu Qing and his company implement a one-vote veto system for the return of flights, that is, anyone in the cockpit shouts the command of the return to flight, which is equivalent to the captain's decision to return to flight.

After the captain turns to the five sides using the flight selection, he takes the channel as the center line and turns left and right, which can give more descent time.

Under the airbrake, landing gear and maneuvering maneuvers, the altitude deviation was quickly corrected. The captain saw that the altitude was almost there, and did not retract the speed brake, because they were the five flaps, and they had to continue to slow down and release the flaps.

Cancel the descent of the altitude layer change and use the vertical rate descent instead, pushing the descent rate of a thousand feet, keeping the aircraft no longer higher than the glide path.

The airbrake remains raised and slows down. Thanks to the airbrakes, today's airplanes can ensure a 1,000-foot descent rate while decelerating.

With the deceleration of the aircraft, the flap fifteen, the flap twenty-five (737-700), and the flap thirty are lowered one by one, and when the flap thirty is put down the green light, the plane is on the channel and glide path, and the landing form has been completed, and the captain is ready to press the APP. One watched as the plane stabilized, and was ready to report that the blind landing had been established.

Before the captain could press the APP button with his fingers, the turbulence of the plane suddenly intensified, Xu Qing felt that his body was firmly pressed against the seat, and what was even more terrifying was that he watched the red and black speed bands of the airspeed stretch rapidly, and the top of it rushed directly through the current airspeed, followed by a dull and continuous sound of shaking rods!