Just when Instructor Chang's eyes shifted to the PFD on Xu Qing's side, it was just a second or two, Instructor Chang's low-speed red and black speed band began to rise, and the overspeed speed band moved down, and it was unconsciously that the overspeed and low-speed speed bands were connected.

Today, the airspeed display of the permanent instructor has been completely occupied by the red and black speed bands.

At the moment when the overspeed and low-speed bands coincide, the airspeed also enters the red and black speed bands.

At the same time, the speeding warning and the jittering warning sound at the same time!

The sound of speeding warnings and the screeching of the steering stick resounded throughout the cockpit.

Compared with a relatively simple overspeed warning, the continuous sound of the jitter is more shocking!

The jolt was so loud that it even drowned out the engine noise, penetrating the cockpit door so that the two flight attendants seated in the front cabin could hear it clearly.

The boom of the jiggle was so loud that it seemed to be a series of blows to people's hearts, that even flight attendants who knew nothing about flying could feel that something was going on in the cockpit.

The two flight attendants in the forward cabin are the purser and the third flight attendant for this flight.

Flight attendant No. 3 was still relatively young, and the constant sound of the big hand holding her throat made her almost out of breath.

Young and ignorant, ignorant and fearless!

If you taste a hint of danger, then the aftertaste is the taste of fear.

The purser is a little older, unlike the No. 3 flight attendant next to her, her husband is a pilot, and he also knows a little flight knowledge.

She knew the sound was a jittering lever, a stall warning.

A stall is an unsafe flight state, but it is a relatively conventional flight maneuver, as long as it is not a deep stall, it should not be too difficult to change the stall.

Therefore, compared with the No. 3 flight attendant who was a little flustered, she was relatively calm.

Of course, this composure was only limited to the beginning, and after the sound of the jittering rod lasted for a while, her composure could no longer be supported, especially when other warning voices were faintly heard!

Now it seems that the plane is experiencing more than a simple stall!

The purser's right hand grabbed the corner of the seat without a trace, and his face remained silent, just responding coldly: "Don't speak!" ”

The No. 3 flight attendant looked at the purser's side face, took a deep breath, and pressed down the words that had reached his throat.

Repression does not make fear go away, it only makes fear more unscrupulous.

Fear is uncontrollable, like an airplane that is now uncontrollable.

And...... She should be afraid, because she is in fear itself.

In the cockpit, Instructor Chang's gaze that had just turned over subconsciously turned around in the sound of a jittering rod and a speeding warning. What caught my eye was the speed band that had become a mess on my side.

"Jitter? Stall? And also...... Speeding? "Teacher Chang's thoughts are flying at this moment!

The combination of stalling and overspeeding is generally only seen at high altitudes. At that time, due to the thin air, the aircraft was at the limit of performance, and the speed bands of overspeed and stall were very close and the speed margin was minimal.

Stall and overspeeding occur at the same time under extreme conditions.

Now that we've just taken off, why is there a situation where a speeding warning and a stall warning happen at the same time?

He has been grasping the steering stick for decades, from flying military planes when he was young to switching to civil aviation, flying has been deeply rooted in his blood.

The plane is like a part of his body, and he can still tell what state the plane is in, even without the help of instruments.

It is simply impossible for the planes of today to stall and overdrive!

He had noticed a speed problem from just now, and two warnings that shouldn't have sounded at this time confirmed this.

Quickly swept the PFD on Xu Qing's side, Xu Qing's PFD was as usual, and more importantly, Xu Qing's driving lever did not shake!

Only the captain's side happened...... Shake the rod phenomenon!

"Airspeed inconsistency? Unreliable airspeed? Faulty sensor? ”

Instructor Chang thought of a variety of possibilities in his mind! Such a bizarre phenomenon can only occur if there is a problem with the flight parameters.

Most of the flight parameters are obtained by a variety of sensors. Sensor failure will directly affect the instrumentation display of the aircraft!

Instructor Chang found that the airspeed on his side showed a little more than two hundred and ten knots, while Xu Qing's display was two hundred and thirty knots, and the difference between the two was only a dozen knots.

During his flying career, he experienced unreliable airspeed, when the difference in airspeed between the two sides was more than 50 knots.

In fact, in terms of unreliable airspeed, the difference in airspeed of more than a dozen knots is already very small, and it cannot even be counted as a basis for unreliable airspeed.

What is it that causes such atypical airspeed unreliability?

Even with the experience of the regular instructors, there are still some doubts.

Xu Qing's side is also difficult to train, and he gallops wildly.

At first, the speed warning and jitte warning made him a little flustered, until he realized that the data on his side showed that there was no problem.

He also glanced at the PFD on the captain's side, but the speed band there was quite shocking.

He was even struggling with whether to do a stall change.

Xu Qing also wondered if the airspeed was unreliable. Based on this judgment, he compared the data from the regular instructor with the backup meter.

The current situation is that the flight data on the spare instrument is the same as that on his side, and the data on the instructor's side is the only difference, but the difference is only a dozen sections.

This is one of the emergency ways to judge the right data source for unreliable airspeed.

Generally speaking, two of the three data are the same, and in most cases the flight data in both places is correct. Of course, this is just a method of quick judgment that is not particularly rigorous, and the most accurate method is to do a checklist of "Airspeed Unreliable".

Now it seems that there is a problem with the flight data on the side of the instructor.

"Master, airspeed is unreliable?" Xu Qing asked.

He still kept his climbing stance unchanged, and now he is almost certain that the stall warning is a false signal.

Even if the airspeed is unreliable and the flight data is problematic, the attitude data is always accurate.

The current situation reminded him of the wrong jitter phenomenon mentioned by the crew earlier.

Repetitive failures!

Instructor Chang nodded: "It should be that there is a problem on my side, let's do the memory project first." ”

Xu Qing is familiar with the unreliable memory project of airspeed.

At this time, the autopilot was not turned on, so he took the opportunity to disconnect the automatic throttle again, and at the same time, the instructor turned off the flight guidance on both sides. After doing the three movements, Xu Qing was ready to set a 4-degree attitude and 75% N1, and the regular instructor contacted the tower to inform them of the current situation.

They may not be able to execute the control instructions well due to the unreliable airspeed checklist, which needs to be said in advance.

Just when Xu Qing adjusted the N1 and his attitude, without warning, the balancing wheel was like a wild horse...... Crazy forward trim!

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