Boatswain

"I've given her all I've got captain!"

— Scott Montgomery, Boatswain on the Red Tyrant

The boatswain—sometimes called the bosun—is the technical mind behind the airship’s operations and maintenance. The best boatswains have strong Strength and Intelligence scores, and are proficient in tools related to repairs such as carpenter’s tools.
Role Proficiency: The boatswain can add its proficiency bonus when making checks to understand the functions of a ship or to make repairs to a ship. If the boatswain is already proficient in the requisite skill to make the check, their proficiency bonus is doubled for that check. The check cannot benefit from more than one feature (such as Expertise) that doubles the proficiency bonus.

Character Level	Role Feature
1st	Easy Fix, Expert Knowledge
5th	"Full Speed Ahead!", "Well, Stick It Back Together!"
11th	Tough Ship, "Get Her Back Together!"
17th	Keep It Moving, Improved Hull

Easy Fix: As a tier 1 boatswain, all airship repairs you oversee are performed faster with less expense to the ship. When you participate in a downtime check to make repairs, the check gains a +2 bonus simply for you being there and the initial gp cost is only 5 gp.
Expert Knowledge: Additionally, at tier 1, your knowledge of the ship's design and components makes you more efficient at dealing in new parts and upgrades. If you participate in purchasing new parts or upgrades for the ship, or selling used parts, you can replace any Charisma ability checks made to affect the price with an Intelligence check using proficiency in air vehicles.
Full Speed Ahead!: At tier 2, when you are aboard a friendly airship during combat and the captain commands the ship to move, you can use your reaction to increase the move speed of one of the ship's movement components by 10 feet. Once you use this role feature, you can't use it again for 7 days.
"Well, Stick It Back Together!": Also at tier 2, you can ignore one complication that comes from the repairs or upgrade downtime tasks; the ship suffers no penalty from the complication. Once you use this role feature, you can't use it again for 30 days.
Tough Ship: At tier 3, any ship which you are attuned to gains a bonus to its Strength and Constitution saving throws equal to your Intelligence modifier.
"Get Her Back Together!": Starting at tier 3, if the helm on a ship on which you are attuned to takes damage that would reduce it to 0 hit points, it is reduced to 1 hit point instead. Once you use this role feature, you can't use it again for 7 days.
Keep It Moving: At tier 4, if damage to the ship's movement components reduces its movement speed to 0, it is reduced to 10 ft. of movement speed instead.
Improved Hull: Also at tier 4, when you become attuned to a ship, choose one of the following damage types: acid, cold, fire, lightning, or thunder. The ship becomes resistant to that damage type. If you unattune to the ship, it loses the resistance.