To complete the Vertibird quest in Fallout 2, you need to repair the Vertibird and obtain the fuel cell controller from the Enclave. Use the fuel cell controller to power up the Vertibird and then fly to Navarro. Once there, you can progress the quest further.
Step 1: Locate Navarro
The first step in completing the Vertibird quest in Fallout 2 is to locate Navarro, the Enclave's military base. Navarro is located on the far western edge of the map, just above San Francisco. To get there, you can travel from San Francisco or Modoc, heading west until you reach the coast, then following it north until you find Navarro.
Step 2: Accessing the Base
Once you arrive at Navarro, you will need to find a way to access the base. One way to do this is by wearing Power Armor, as the Enclave guards will not attack you if you are wearing it. You can find Power Armor in various locations throughout the wasteland, or you can try to pickpocket a set from one of the guards at the base.
Step 3: Gathering Intel
Before attempting to steal a Vertibird, it is important to gather intel on the base and its defenses. You can do this by talking to the various NPCs at Navarro, such as the quartermaster, who may have information that can help you in your mission. You can also try hacking into the base's mainframe computer to gather more information.
Step 4: Stealing the Vertibird
Once you feel confident that you have enough information, it's time to steal the Vertibird. The Vertibird is located on the landing pad in the center of the base, and it is heavily guarded. You will need to either sneak past the guards or engage them in combat to reach the Vertibird. Once you reach it, you will need to hotwire the Vertibird to get it running.
Step 5: Fleeing Navarro
After successfully stealing the Vertibird, your next objective is to flee Navarro before the Enclave forces can retaliate. Once you are airborne, you will need to navigate the Vertibird out of the base and towards your next destination. Be prepared for Enclave reinforcements to try and shoot you down as you make your escape.
Step 6: Completing the Quest
Once you have successfully stolen and escaped with the Vertibird, you will have completed the Vertibird quest in Fallout 2. You can now use the Vertibird to travel to different locations on the map, making it easier to explore new areas and complete other quests. Enjoy your newfound mobility and firepower with your very own Vertibird!