Metwrench From United States of America, joined Aug 2001, 750 posts, RR: 2
Reply 2, posted (13 years 4 months 1 week 5 days 11 hours ago) and read 865 times:
I don't have all the manuals I originaly thought I did, will go out to the archives next weekend and search again.
It's been 18 years since I last worked on this airframe, but as memory serves me.....
The elevators are free floating, no direct input from the yoke. The tabs are the only direct link to the yoke, ie. servo tabs. It is common to see the elevators split when parked tail into the wind or taxiing down wind. airspeed will fair the elevators and back pressure on the yoke will actually move the tabs down forcing the elevators up. Auto-pilot servo's also actuate the tabs.
Musang From United Kingdom, joined Apr 2001, 885 posts, RR: 6
Reply 3, posted (13 years 4 months 1 week 5 days 3 hours ago) and read 861 times:
To add to Metwrench's explanation, the inboard tabs are the servo tabs, each side is connected to the same side control column, the columns being connected under the cockpit floor by spring-loaded disconnect system, in case of pitch system jam on one side.
60 lbs force will break out the disconnect, then you discover which side was jammed and which pilot still has pitch control.
Each servo tab circuit has a "blow back spring" to limit the tab's authority according to airspeed.
Trim tabs are the outboard sections, and are controlled conventionally by cables, rods and screw jacks. Inputs are the thumb operated trim switches, manual trim wheels, and the autopilot.