Kerbal Space Program

Kerbal Space Program

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MechJeb in Career Mode
By Thinkpadius {R}
This is a short guide outlining where aspects of MechJeb are unlocked in the tech tree of career mode as of Version 0.22. It should continue to be accurate beyond 0.22 as long as
a) the file structure of the game doesn't change and
b) mechjeb doesn't switch the positions around in an update.

Please rate this guide if it was helpful, and visit my game development page for
Antarctic Simulator 1914: Heroes of the Antarctic[]
The Tech Tree
MechJeb controls are split up among multiple parts of the the tech tree.

Important information: If you have been playing the game and have already researched these techs before installing mechjeb, you won't experience the benefits of mechjeb. It's weird, but the solution is simple - just research the previously researched techs again, it may indicate a cost, but it will be free and then mechjeb will be enabled.

Flight Control

  • Custom Window Editor
  • Smart A.S.S.

Advanced Flight Control

  • Maneuver Planner
  • Node Editor
  • Translatron
  • Warp Helper
  • Attitude Adjustment
  • Thrust Window
  • RCS Balancer Window

Field Science

  • Rover Window

Unmanned Tech

  • Ascent Guidance
  • Landing Guidance
  • Spaceplane Guidance

Advanced Unmanned Tech

  • Docking Guidance
  • Rendezvous Autopilot Window
  • Rendezvous Guidance
Position on the Tech Tree
This section contains fixes and and answers to questions I found in the comments. Be smart about which solution is best for you, and if you find a better way please post it in the comments.

  • I've re-researched the parts, but MechJeb still won't show:

    Try deleting 'Mechjebs settings global in C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\GameData\MechJeb2\Plugins\PluginData\MechJeb.

    if this doesn't help, you may have incorrectly installed mechJeb.
    (Navigate from your gamedata => MechJeb folder => "Plugins" => "PluginData" => 'mechjeb_settings_global')

  • I clicked on the research group but I still don't have the Mechjeb tech:

    Click on the Tech Group icon, then go click on the individual mechjeb tech that appears in the right-hand window. Click the research button.

  • Do I have to unlock Mechjeb in Sandbox mode?


  • I unlocked the Mechjeb part, but many of the options are greyed out in-flight:

    You unlock the Mechjeb part early on and the part never changes, but the features will get unlocked (not greyed out) as you research the new mechjeb technologies, they're not all immediately available.
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Oscilio Feb 13 @ 3:08am 
Im having problems ive unlocked advanced flight control but it doesnt give me the right options ive tried deleting the settings but it hasnt helped
[HUN]ColemanV Jul 30, 2014 @ 9:54am 
Un1que_gam3r522 - Thx mate!

Though meantime I've decided 0,24 was worth reinstalling KSP with clean install.
After reinstall I've got MechJeb2 installed the same way as before and now it's all cool.

Some mods though makin' the loading screen stop halfway, even though they've been cleared by mod developers as compatible.
Thinkpadius {R}  [author] Jul 29, 2014 @ 7:58am 
@Un1que_gam3r522 Glad it was helpful!
Un1que_gam3r522 Jul 28, 2014 @ 9:10pm 
@[HUN]ColemanV. Only 1 mechjeb module will be 'lit' at a time, Also, make sure you have electrical charge. Also, the mechjeb menu can be hidden by mechJeb settings, so try deleting 'Mechjebs settings global in C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\GameData\MechJeb2\Plugins\PluginData\MechJeb. if this doesn't help, you may have incorrectly installed mechJeb.
(Navigate from your gamedata => MechJeb folder => "Plugins" => "PluginData" => 'mechjeb_settings_global')

This guide was actually quite helpful to me, as im mid-teir in techs right now and badly wanting that fancy docking autopilot and rondevuez (#Typo, but idk how to spell it right) autopilot moduls :D
[HUN]ColemanV Jul 13, 2014 @ 7:29am 
Greetings everyone!

I've recently decided to return to KSP (after a brief tour of Moonbase Alpha ) and found that even though I've re-researched parts, MechJeb got a red light on my rockets, and I ain't got no MechJeb window or any indication of it on the right side of the screen.

What's goin' on? (I would need only "Smart A.S.S." because it's doin' the pointing to a certain direction faster and much more accurately then I would be doin' it and it's rather handy at manual docking and landing)
FoX Jun 4, 2014 @ 7:58am 
for those still having issues... click on the Tech Group icon above... Then go to the window on the right that shows all the individual techs... Click on each of the MechJeb tech that you dont have yet. there should be a button that appears to research it.

the button is on the individual techs. NOT the group!
Sir Fieel the Universe Destroyer May 18, 2014 @ 7:39am 
Soo.. nice.. list?
Thinkpadius {R}  [author] Apr 2, 2014 @ 10:23am 
@Neon Chikken it basically involves clicking on the button again as if you were selecting that reserach option. You don't actually lose and RP though.
NeonChikken <Drago> Apr 2, 2014 @ 8:31am 
it might sound stupid, but how do you exactly research a previously researched tech?
goatgas Mar 20, 2014 @ 6:57pm 
Add this to wiki, this is the only place I have found that showed which techs to learn to unlock mechjeb.