Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
146 Trimtabs  
User currently offlineSkidmark From United Kingdom, joined Feb 2001, 39 posts, RR: 0
Posted (12 years 4 months 1 week 6 days 11 hours ago) and read 761 times:


Click for large version
Click here for full size photo!

Photo © Daniel Werner



Anyone know why there are two trimtabs on the each elevator? And why they seem to operate seperatly?


3 replies: All unread, jump to last
 
User currently offlineXXXX10 From United Kingdom, joined Jan 2000, 777 posts, RR: 0
Reply 1, posted (12 years 4 months 1 week 6 days 1 hour ago) and read 728 times:

The 146 is one of the few civil jets to have a fixed tailplane, perhaps this has something to do with it

User currently offlineMetwrench From United States of America, joined Aug 2001, 750 posts, RR: 2
Reply 2, posted (12 years 4 months 1 week 5 days 3 hours ago) and read 714 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.

Met


User currently offlineMusang From United Kingdom, joined Apr 2001, 845 posts, RR: 7
Reply 3, posted (12 years 4 months 1 week 4 days 19 hours ago) and read 710 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.

Regards - Musang


Top Of Page
Forum Index

Reply To This Topic 146 Trimtabs
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Do 737 Classic & BAe 146 Have Any Composite? posted Thu Apr 26 2007 05:31:50 by 747400sp
757-200 And BAe 146: Danger? posted Sun Feb 4 2007 14:55:50 by BA787
BAe 146/ RJ Vs 737 Classic Which Burn More Fuel? posted Tue Jan 2 2007 00:04:00 by 747400sp
BAe 146/RJ Overhead Panel posted Mon Nov 13 2006 15:17:27 by Kris
Braking/Spoilers On BAe-146 posted Tue Oct 17 2006 13:55:24 by Smoose
BAe 146 - Here To Stay? posted Sat Jul 22 2006 01:53:29 by BoeingOnFinal
A Smaller Twin Engines BAe 146 Design? posted Sun May 7 2006 20:30:11 by 747400sp
BAe 146/RJ Throttles Question posted Wed Mar 15 2006 14:01:30 by Kris
Official Story Of Northwest BAC-146 N528Xj posted Tue Jan 3 2006 06:16:21 by Cdfmxtech
Aer Lingus BAE-146- Ferry Flights posted Mon Oct 31 2005 12:55:13 by EI747SYDNEY

Sponsor Message:
Printer friendly format