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Originally Posted by [email protected]
(Post 11231980)
There are those - not me BTW - who don't like or trust autopilots, usually because they were trained on basic (or old) helicopters and were never taught to use them or never bothered to learn.
It wouldn't be a surprise that he was flying completely manually if he was one of those. I agree completely and always wondered this. Another option is Auto Trims off SAS on. Pretty stable for VFR flight but doesn’t interfere with hand flying. |
Yes, we flew our 412 EPs in SAS mode for VFR stuff and ATT mode for IFR stuff - pretty much the way it was designed to be used.
For those that don't know, SAS mode is generally rate damping in pitch and roll to make the aircraft more stable but slightly less responsive - it will maintain straight and level more or less if well trimmed but will gradually wander away from any set datum. It typically has about 10% control authority and is fast acting. ATT mode is intended to hold the aircraft attitude and return it to that attitude following a displacement - it will have 100% authority but be slower moving to prevent a runaway in an actuator being uncontrolled. ATT mode is often required to couple upper modes ie ALT hold, TAS hold, ALTA/GA etc. Not trying to be authoritative or teach granny to suck eggs, just providing basic info for those that don't use APs. |
Originally Posted by SLFMS
(Post 11232320)
I agree completely and always wondered this. Another option is Auto Trims off SAS on. Pretty stable for VFR flight but doesn’t interfere with hand flying.
A new inexperienced pilot would have a very hard time conducting a smooth lift off and flight in this mode ...besides contradicting directly , the RFM |
Originally Posted by [email protected]
(Post 11232341)
Yes, we flew our 412 EPs in SAS mode for VFR stuff and ATT mode for IFR stuff - pretty much the way it was designed to be used.
For those that don't know, SAS mode is generally rate damping in pitch and roll to make the aircraft more stable but slightly less responsive - it will maintain straight and level more or less if well trimmed but will gradually wander away from any set datum. It typically has about 10% control authority and is fast acting. ATT mode is intended to hold the aircraft attitude and return it to that attitude following a displacement - it will have 100% authority but be slower moving to prevent a runaway in an actuator being uncontrolled. ATT mode is often required to couple upper modes ie ALT hold, TAS . I'm rarely out of ATT Mode in normal ops but for jinxing around close to ground, SAS MODE is ideal . I do occasionally fly without any stab on [deselect yaw, pitch and roll trims,,...now its a big sloppy Jet ranger... but good for practice.. I suggest strongly that Kobes pilot had no usefull knowledge of the SPZ7000 autopilot system... and in the end, what could have saved him.. |
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