Airship Down

Airship Down is an Institute 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.

Detailed walkthrough
Dr Li greets you and then leaves to 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 a electromagnetic shield that makes it impossible for the Institute to teleport troops into the base. The plan is that you take down the field by going an poorly guarded part of the airport and from there works your way to the generators and destroys 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 use to call in extra synths to the spot where you place a beacon.

After that you will go to the main target - a huge robot named Liberty Prime. Dr Li explains that it is and old weapon and allso tell you about her role in making it operationable. Working with Liberty Prime has given her good knowledge on how it works, which now is used to manipulate it. Rosalind entusiastically 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 Prydwenis a communist vehicle and shoot it down. Your job is to bring that synth safely to Libert Prime.

Next you relay from the Institute to the airfield and fight your way to the generaators and after that to Liberty Prime. Climb up to the head of the robot so the hacker synth can do the uploading. Defend against a masssive assault from air and ground. Before finishing the upload you want to loot the T-60f power armor from the Elder Maxson. When the uploading is done Liberty Prime will announce that it will attack the communist vehicle. You will not see that attack because you are teleported away.

The quest completes, and the next quest starts.

Bugs

 * It can happen that the hacker synth will not spawn to reprogram Liberty Prime and one will be stuck to reach Liberty Prime.
 * Fusion core will not spawn in the generator and will still run even though the player character previously took it in the past.
 * Only current fix for the fusion core bug and the synth bug is to complete it via the console. To complete the quest type into the console "completequest Inst307".
 * Elder Maxson disappears after player character leaves area.