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What is the maximum speed of the Cessna Citation X?

I want to attempt to break the sound barrier but I do not know if its possible, where, or how to do it.

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    $\begingroup$ If you want to break the sound barrier, there are a number of places you can go to buy rides in ex-military aircraft more than capable of doing it without breaking apart. Would be much cheaper than buying a Citation X and having the insurance company deny the claim (not that you'd be there to contest it anyway). $\endgroup$ – Ron Beyer Nov 1 '16 at 1:23
  • $\begingroup$ A better candidate for what you're asking about might be the G650. Published MMO is 0.925, with rumors of flight tests beyond 1.0 that were no big deal. May be problematc to get somebody to just lend you one for a joyride, though. I've heard the Russians will sell you a MiG-25 ride for the right price, so that may be your best bet. $\endgroup$ – Ralph J Nov 1 '16 at 2:26
  • $\begingroup$ If you just want to break the sound barrier then an ex-military jet of some kind is probably the simplest way. If you have EUR 11,500 then these guys will take you in a MiG-29, for example. And as a general comment, I suggest that before posting questions you consider exactly what you want to know, e.g. do you want to know the maximum airspeed of a Citation X, or do you want to know where/how you can break the sound barrier? Those are completely different questions. $\endgroup$ – Pondlife Nov 1 '16 at 14:13
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    $\begingroup$ @TomMcW eh, I'd find a better example, those damages were due to the excessive g-loads. $\endgroup$ – Federico Nov 2 '16 at 9:25
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    $\begingroup$ If you want to do it, become a test pilot and then you will be allowed to fly the Citation X a bit above MMO. The safety margin until flutter or Mach tuck will kill you should allow to go supersonic. But once you are a test pilot I am sure you will see the silliness of that particular concept. $\endgroup$ – Peter Kämpf Nov 2 '16 at 9:26
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The Cessna Citation X has a maximum speed limitation of 0.92 Mach.

The following limitations apply to the Cessna Citation X, serial numbers 750-0001 through 750-0500:

  • Below 8000 ft., the maximum operating speed (Vmo) is 270 KIAS.

  • Between 8000 ft. and 30650 ft., the maximum operating speed (Vmo) is 350 KIAS.

  • Above 30650 ft., the maximum operating speed (Mmo) is 0.92 Mach.


The Cessna Citation X+ has a maximum speed limitation of 0.935 Mach.

The following limitations apply to the Cessna Citation X+, serial numbers 750-0501 and on:

  • Below 8000 ft., the maximum operating speed (Vmo) is 270 KIAS.

  • Between 8000 ft. and 31500 ft., the maximum operating speed (Vmo) is 350 KIAS.

  • Above 31500 ft., the maximum operating speed (Mmo) is 0.92 Mach.


All information above is cited from the Cessna Model 750 type certificate number T00007WI.


While the Citation X+ is currently the fastest production civil aircraft, its top speed at altitude is still a little below the the speed of sound. At lower altitudes, the speed limitations are even more restrictive, keeping the aircraft well below the local speed of sound.

The speed of sound is expressed as Mach 1.0. The Citation X is limited to Mach 0.92 and the Citation X+ is limited to Mach 0.935. This means that neither of the Citation X series aircraft are allowed to be flown at or beyond the speed of sound.

The limitations for the Citation X series of aircraft prohibit flight at or above the speed of sound, Mach 1.0. Attempts to do so are generally against regulation, reckless, and ill advised.

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The Citation X maximum speed is Mach 0.935.

You could have gleaned this information from the Wikipedia page, which you are obviously familiar with from your other questions.

What this has to do with breaking the sound barrier is entirely unclear. The Citation X is not the aircraft to do it with, but if you have funds I'm sure you could find a privately owned warbird that is designed for it and a pilot/owner who'll oblige you.

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  • $\begingroup$ Wikipedia has an incorrect figure. The Mmo of Citation X is 0.92 M. The 0.935 figure is for Citation X+ $\endgroup$ – TomMcW Nov 4 '16 at 22:38
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From Cessna Citation X:

  • Maximum speed: Mach .935 (MMO)

So, no. Exceeding the maximum rated speed in that aircraft would be highly inadvisable. More generally, so would attempting to exceed the sound barrier in any aircraft that is not specifically designed to do so.

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  • $\begingroup$ Would the plane shake or something and could I do at sea level where the sound barrier is lower? $\endgroup$ – Daniel Chung Nov 1 '16 at 0:59
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    $\begingroup$ @DanielChung I don't know exactly what you mean by the sound barrier being lower at sea level, but note that the speed of sound is higher in denser materials and slower in less dense material. In other words the speed of sound is higher at sea level and lower at 30,000 ft. $\endgroup$ – J Walters Nov 1 '16 at 5:13
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    $\begingroup$ @DanielChung The maximum speed is expressed in the local speed of sound (Mach number), not relative to the speed of sound at sea level. The aircraft is physically limited due to supersonic effects, not to a certain true air speed. $\endgroup$ – Sanchises Nov 1 '16 at 10:26

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