Airship Down is an Institute main quest in Fallout 4. In this quest, the Sole Survivor, along with an army of synths, storms Boston Airport in an attempt to cripple the Brotherhood of Steel. This is done by hacking Liberty Prime into targeting the Brotherhood of Steel as Chinese Communists. Liberty Prime then destroys the Prydwen via his dual eye lasers.
|Institute main quest: Airship Down|
|Speak to Evan Watson or Doctor Li.|
|Use the relay to reach the Boston Airport.|
|Infiltrate the Airport.|
|Destroy the Brotherhood generators.|
|Reach Liberty Prime.|
|Defend the Synth hacking Liberty Prime.|
|Evacuate the Airport|
|Reward: 600 XP|
|Leads to: Nuclear Family|
Doctor Li or Doctor Watson greets you and then leaves Rosalind Orman to explain the details of this quest. She informs you that the target is the base of the Brotherhood of Steel operations in the Commonwealth - the Boston Airport. It is shielded by an electromagnetic shield that makes it impossible for the Institute to teleport troops into the base. The plan is that you will take down the field by infiltrating a poorly-guarded part of the airport, and from there work your way to the generators and destroy them. For each generator that is destroyed, the Institute will teleport some synths into the base. She gives you a couple of Institute Beacon markers, which you can then use to call in extra synths to the point where a marker is placed.
After that, you will go to the main target - a huge robot named Liberty Prime. Doctor Li explains that it is an old weapon, and also tells you about her role in making it operational. Working with Liberty Prime has given her good knowledge on how it works, which will now be used to manipulate it. Rosalind enthusiastically explains that a synth has been programmed with a computer virus and will transfer it to Liberty Prime, making it believe that the Brotherhood airship Prydwen is a communist vehicle. Your job is to bring that synth safely to Liberty Prime.
You relay from the Institute to the airfield and fight your way to the generators, and then to Liberty Prime. Climb up to the head of the robot so that the hacker synth can begin uploading the virus. Defend the hacker against a massive assault from both the air and ground. Before finishing the upload, Elder Maxson attacks via a vertibird. If the vertibird is destroyed, he will fight on the ground. This gives the player the opportunity to obtain his Elder power armor and his unique weapon: Final Judgment. When the upload is complete, Liberty Prime will announce that it will attack the "communist" vessel, and fires its eye laser at the ship. As the ship begins to fall, you will be teleported a short distance away to observe the fiery wreckage.
The quest completes, and the next quest starts.
- The higher your level is, the stronger synth variants will spawn. Doing the quest above level 71 will cause synth eradicators to spawn, which are the strongest variants of synths, on par with Brotherhood knights.
- Brotherhood soldiers will keep spawning until the virus upload is complete, so be prepared for a tough multi-front fight.
- If having convinced Doctor Li to rejoin the Brotherhood through From Within, Doctor Watson will explain the quest details instead.
- Depending on various quest choices, several named characters may be present during the fight:
- Paladin Danse will fight if he hasn't left the Brotherhood, namely by not having started Blind Betrayal.
- Paladin Brandis will fight if he was convinced to rejoin the Brotherhood during The Lost Patrol.
- Initiate Clarke will fight if convinced to turn himself in during Duty or Dishonor. If Precipice of War is started prior to this quest, Clarke will appear but not be hostile.
- If you have completed Rockets' Red Glare for the Railroad before completing End of the Line this quest is skipped entirely and you will progress immediately to Nuclear Family. This is most likely not a bug as the end result of both quests is destroying the Brotherhood airship.
- If you fast travel away from the airport, and then back to it, you will spawn in front of a large amount of heavily armed brotherhood soldiers already firing upon on you when the screen loads.
- This quest is the only known method (aside from console commands) to acquire Elder Maxson's BOS VII T-60f power armor with the unique BOS Elder paint scheme.
- If the player is still friendly with the Brotherhood due to taking the available exploit during Mass Fusion, this quest will become much easier. Although, you will become hostile with the Brotherhood if you are detected while destroying a generator, so it's a good idea to bring a silenced weapon with you.
- pc xboxone If you've killed all of the BoS members at the Airport before destroying the last generator, you may not be able to complete the objective Reach Liberty Prime. [verified]
- pc xboxone Elder Maxson may not appear during the battle, making his unique items unobtainable. [verified]
- ps4 xboxone If fast traveling away from the airport after killing BoS members, their weapons and armor may respawn on return, including that of Quinlan, allowing for extra loot. This may even occur if the player character uses the lift to get to the third generator. [verified]
- ps4 xboxone when asked to "work with members of the Institute" the quest will take you to Evan (if Madison Li is killed or persuaded to join the BOS). You will be able to ask him "want to fill me in on what's happening", but he will never give you the information, but will totally repeat the same useless lines over and over again. [verified]