View Full Version : ALTN LAW max speed 320/.77
MD83FO
16th Jan 2015, 14:48
Hello I need a reminder for the regulatory (load factor/bank)reason why the speed limit is reduced without protections.
Thanks!
Mad (Flt) Scientist
16th Jan 2015, 15:06
AB may have taken credit for the Normal Law overspeed protection in defining the maximum upset speed (gust encounter etc). If overspeed protection is lost, they may have to reduce the limit speed so that the same assumed gust gives the same max speed.
vilas
16th Jan 2015, 15:50
Aircraft manufacturer has to demonstrate aircraft is free of flutter up to VD/MD which is normally reached only in dive. The difference between VMO and VD is around 50KTS. for non FBW aircraft. This margin in case of FBW aircraft is reduced because of protection. In case of A380 it is 35KTS and MMO .89 and MD.96 That is why it is reduced with loss of high speed protection.