Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

Autopilot for Takeoff

Tech Log The very best in practical technical discussion on the web

Autopilot for Takeoff

Old 5th Jun 2006, 19:09
  #1 (permalink)  
Thread Starter
Join Date: Jun 2006
Location: Canada
Posts: 94
Likes: 0
Received 0 Likes on 0 Posts
Autopilot for Takeoff

I'd like to know why the autopilot is not used or can not be used for the takeoff phase of the flight.
Jetdoc is offline  
Old 5th Jun 2006, 19:48
  #2 (permalink)  
Join Date: Sep 2002
Location: La Belle Province
Posts: 2,179
Likes: 0
Received 0 Likes on 0 Posts
I'd suggest reaction time issues might be a factor - typically when a failure occurs with AP on the time assumed for the crew to recognise the failure and react to it is assumed to be longer than for hands-on flying. If you had to assume, say, a 4 second dwell at V1 instead of 2 seconds, for the rejection case, the distance penalties might be considerable.
Mad (Flt) Scientist is offline  
Old 5th Jun 2006, 19:57
  #3 (permalink)  
Join Date: Mar 2006
Location: Choroni, sometimes
Posts: 1,974
Likes: 0
Received 0 Likes on 0 Posts
After pushback I engage the autopilot.

On blocks, I switch it off. Sometimes the copilot does it.
hetfield is offline  
Old 5th Jun 2006, 22:18
  #4 (permalink)  
Join Date: Mar 2000
Location: Arizona USA
Posts: 8,571
Likes: 0
Received 0 Likes on 0 Posts
Ah, well actually, Jetdoc, the autopilot CAN be used during takeoff on a few types, the Lockheed TriStar*, is but one example.

*Except for those that were on the British register, oddly enough.
Never understood just why.
It must be a British thing...
411A is offline  
Old 5th Jun 2006, 23:48
  #5 (permalink)  
Join Date: Feb 2006
Location: The aussie part of pprune
Posts: 189
Likes: 0
Received 0 Likes on 0 Posts
Why would an autopilot even need to be used for takeoff? Pilots seem to do such little hands on flying these days with all the technology avaliable.

They do a great job anyway, much better than what an autopilot could do, why fix something that isn't broken?
multi_engined is offline  
Old 6th Jun 2006, 03:02
  #6 (permalink)  
Thread Starter
Join Date: Jun 2006
Location: Canada
Posts: 94
Likes: 0
Received 0 Likes on 0 Posts
Actually, I heard an explanation about 25 years ago but I can't remember it. FD has a takeoff mode and maybe there may be a CWS takeoff mode but there still seems to be no command takeoff mode.
All I've found so far is some FAA info related to not engaging an autopilot at low altitudes axcept for autoland modes.
Jetdoc is offline  
Old 6th Jun 2006, 06:38
  #7 (permalink)  
Join Date: Aug 2002
Location: Switzerland, Singapore
Posts: 1,309
Received 0 Likes on 0 Posts
I would say it's a certification problem. Technically I see no problem why it shouldn't be possible. Lots of airplane take off automatically (because they don't have a pilot in the cockpit).

The reason why it's not certified is most probably because pilots have to manually abort if something goes wrong. An automatic could also decide but that's (fortunately) not yet the case. So if you would have to switch of the autopilot first and then abort the TO this would cause more delay and maybe more overruns/other incidents/accidents.

Just my thoughts, no regulations to back it up.

Dani is offline  
Old 8th Jun 2006, 20:24
  #8 (permalink)  
Join Date: Jun 2005
Location: NY
Posts: 278
Likes: 0
Received 0 Likes on 0 Posts
Admittedly, I was very skeptical at first about "auto takeoff" ability on the
L-1011, but after both 411A and in a prior thread FE Hoppy said it possible, I am amazed and convinced, but what about those weird cases? such as when an abort must be done after Vr for extreme situations...yes it happens. what will it do then? I think ALL takeoffs should be done with the pilot's hands and feet ...just in case

Last edited by rhovsquared; 8th Jun 2006 at 20:40.
rhovsquared is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.