“c9988，expect_runway_27，you_are_no.2_and_follow_the_da20_ahead_of_you.altimeter_30.12。" The controller replied and asked Xu Wei and them to follow the DA20 in front of them, and it was expected that after the previous plane landed, they would land on runway 27.

The last "altimeter_30.12" refers to the altimeter dial positive value of 30.12, that is, QNH, because now airplanes generally use barometric altimeter, the air pressure at the same altitude will change with temperature and humidity, so, every once in a while or to reach a new airport need to calibrate the altimeter to dial the positive value, of course, at a high enough altitude, all aircraft use 29.92 as the altimeter dial positive value, and the altitude at this time is the standard barometric altitude.

When the GPS showed that there were still five nautical miles from the airport, the DA20 in front of them landed first and taxied out of the runway, and as soon as the runway was cleared, Xu Wei and they got permission to land.

At 3 nautical miles, the instructor began to do a pre-landing checklist: adjust the throttle to 1500rpm, turn on the vaporizer heating switch, and set the flaps to 10 degrees. Again, it is worth mentioning that the reason why the vaporizer is heated is because when the throttle is lower than 1500rpm, the inside of the vaporizer is prone to icing, and once it freezes, the performance of the engine will be reduced or even stalled.

Suddenly, the instructor turned to Xu Wei and asked with a smile, "would_you_like_to_land." Xu Wei was stunned, can I land the plane by myself?

Of course, Xu Wei was 10,000 willing in his heart, and he felt a little excited to fly the plane to land steadily, and he also had the capital to brag about it after he went back, of course, all this was limited to imagination. The reality is... Landing is a complete technical job, the grasp of airspeed, the judgment of pitch, and the maintenance of the direction of the nose are all very important, and it is impossible for Xu Wei to land smoothly as a newcomer.

Xu Wei didn't really think that the instructor would rest assured that he would land, there was not much time for Xu Wei to think about it, the runway had already appeared clearly in his field of vision, Xu Wei was unwilling to let go of this opportunity, and one experience was enough to show off for a few days. Xu Wei is the right seat, so he controls the throttle with his left hand and grabs the steering wheel with his right hand, which is exactly the opposite of the instructor. The instructor also grabbed the steering wheel with one hand and covered Xu Wei's left hand with the other hand in order to take over the plane at any time in a dangerous situation.

The plane was 2 nautical miles from the airfield, and the instructor shouted: "FLAP20"

Xu Wei's reaction was very fast, and the instructor had indicated to Xu Wei the position of the flap control before, and he still remembered that he let go of the hand holding the accelerator and adjusted the flap to 20 degrees. The aircraft immediately raises its head, and the flaps increase the curvature of the wings, and the lift increases, therefore, the flaps can be defined as a lifting device. On the other hand, the flaps will produce additional resistance, which makes the aircraft begin to descend after a moment of ascent, and the descent slope is steeper, but the speed does not increase during the descent, you must know that the gravitational potential energy of the aircraft during the descent process will be converted into kinetic energy, which is usually manifested as an increase in airspeed, but the approach speed should not be too fast, each model of aircraft has a reference value, exceeding the reference value too much, and it is easy to make a heavy landing when grounding, which is very harmful to the body structure. The main function of flaps is to allow the aircraft to descend quickly without increasing airspeed, and they are commonly used in the approach phase.

Xu Wei carefully controlled the steering wheel, hoping to keep it on the runway, but it backfired, and the maneuvering behavior on the steering wheel was delayed in reflecting the attitude of the aircraft.

For example, if the plane is on the left, Xu Wei pulls the steering wheel on the right, the plane will not react immediately, Xu Wei will feel that the strength is not enough, and pull the steering wheel deeper to the right, and the plane will start to turn to the right after a second or two. Then, Xu Wei pulled the steering wheel to the left and repeated the previous mistake. If you look down at the flight trajectory of the plane from above, you will find that Xu Wei presents a huge "S" shape. Any professional pilot who sees Xu Wei's approach trajectory will definitely sigh with emotion, "It's really ugly." ”

As one of the parties involved, the instructor did not interfere with Xu Wei's crooked approach trajectory, and in his opinion, it was great for a novice to be able to drive the plane to the mouth at the end.

At 1 nautical mile, drop the 30-degree flaps and you will soon reach the runway.

“follow_my_control！” The instructor said. Xu Wei also felt another manipulative force exerted on the steering wheel, it should be that the instructor was helping Xu Wei make minor corrections, but did not completely take over the plane, he wanted Xu Wei to feel how he controlled the plane.

The landing of the plane is more based on feeling than blunt data, and cultivating Xu Wei's sense of controlling flight is the purpose. The plane quickly crossed the runway mouth, close to the ground, and the instructor was just about to teach Xu Wei how to glide, when the change was steep, and a sudden left wind hit the plane, blowing half of the plane out of the runway.

Xu Wei and the instructor were taken aback.

“i_have_control。” The instructor shouted, meaning to take over the plane, immediately increase the throttle, and control the throttle so that the plane does not descend, and at the same time adjust the plane to return to the runway.

The wind on the left side seemed to be on the airplane, always preventing the plane from returning to the runway, and it was about to cross a third of the runway, and it did not even do the most basic alignment of the runway centerline.