Alaska Stat. § 18.26.140
A pledge of revenue or other money, obligations, or assets by the authority is binding from the time the pledge is made as against any parties having subsequent claims in tort, contract, or otherwise, irrespective of whether those parties have actual notice of the prior pledge. The pledge must be noted in the board's minute book and is constructive notice to all parties. Neither the resolution nor other instrument by which a pledge is created need be otherwise recorded, nor is the filing of any financing statement under the Uniform Commercial Code or other law required to perfect the pledge. Revenue, rent, or other money, obligations, or assets so pledged and later received by the authority are immediately subject to the lien of the pledge without any physical delivery or further act.
AS 18.26.140