Descent mode with turbulences
When Turbulence is present and the airspeed indicator move fast from ( ej: 250 to 240 ias or something so ) ¿ What descent mode do you prefer to use ? FLCH, VS, or manual mode
With FLCH you will find that the aircraft pith down or up very fast trying to maintain the preselected ias.
With VS and A/T on, the aircraft will maintain the preselected VS and the preselected ias. This will lead to a constant increase and decrease in power. Perhaps it could be a possible to fly without A/T on, but I am not sure.
In manual mode you will fly attitudes and its perhaps the most confortable option for such scenario.
In the md83 you will find the TURB mode. If you select it, this will happen:
--A/T OFF
--Vertical speed window is now: degrees AND or ANU ( attitude nose down or up ) you select then the attitude you want, and it will be flown by the autopilot
--Automaticaly it will revert to HDG HOLD mode, then you can change to HDG, is only to prevent overbanking with heavy turbulences
Alejandro
Argentina