Cross Over Altitude
Thread Starter
Join Date: Apr 2014
Location: Wish to live near Poles
Posts: 54
Likes: 0
Received 0 Likes
on
0 Posts
Cross Over Altitude
Cross Over Altitude : Altitude at which a/c speed limited by Vmo changes to Mmo (at .76 Mach) .A320 FCOM limitation states cross over Altitude as 25000' , But is Cross over Altitude constant ? It could change at any time right ? since it is a Function of TAS and Temp , Please explain.
Join Date: Mar 2006
Location: Ormond Beach
Age: 49
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
It is constant, because the aircraft is programmed that way. What changes is the actual Mach number based on TAS and Temp, as you have suggested, but the "crossover" altitude stays the same only because that's what the manufacturer chose.
Moderator
Sonic velocity has a temperature consideration ...
Mach has naught to do with OAT.
Suggest a search on the topic as it regularly gets done to death. Typical discussion here
Mach has naught to do with OAT.
Suggest a search on the topic as it regularly gets done to death. Typical discussion here
Join Date: Jan 2012
Location: Not far from the edge of the Milky Way Galaxy in the Orion Arm.
Posts: 510
Likes: 0
Received 0 Likes
on
0 Posts
Ah, yes. Tis indeed the Local Speed of Sound, which is thus determined from temperature and not the Machno.
Mach is Dynamic over Static. D/S (enuf said big time)
Mach is Dynamic over Static. D/S (enuf said big time)