# Is there a relationship between transonic buffet magnitude and altitude?

Transonic buffet happens at mach 0.95. The correlated true airspeed varies with altitude. Does the transonic buffet magnitude also vary with altitude, and if so, how?

• If an aircraft (fighter jet) is in transonic regime then the buffet occurs. Yes or no? But transonic speed region's is definitely dependent on the altitudes. Yes or no? So my question: is this different altitudes gives buffet intensity( during maneuver) differently any times? Now you understand? – George Geo Oct 24 '19 at 12:17
• I don't know about fighter jets; never flown or designed one. But for commercial aircraft, you cannot have buffet during cruise up to your maximum operating Mach number. Forbidden by regulations. – JZYL Oct 24 '19 at 12:22
• Recommend editing your question to the first comment. Some punctuations and explanation (for example, what motivates the question, rationale for your assumptions) would help. – JZYL Oct 24 '19 at 12:34
• @Jpe64 "Transonic buffet happens always at mach 0.95"? That's misleading borderline incorrect. – JZYL Oct 24 '19 at 14:14
• @Jimmy that's not my statement, I merely tried to edit the question so that it would be comprehensible. You can check out the edit history to see the original question and edit further should you wish to do so. – Jpe61 Oct 24 '19 at 14:40

For a single Mach number, the AOA (or $$C_{L}$$) associated with buffet onset is generally constant; there will be some differences due to CG position, the associated trim and Reynolds number effects. During aircraft design and flight testing, the buffet onset boundary similar to the one below is mapped out. As you can see, the general trend is a decrease in buffet onset boundary with Mach (though the trend can reverse depending on the airplane).