Sections 4, 5, 7, and 8 of the Administrative Procedure Act (5 U.S.C.
1003, 1004, 1006, and 1007) do not apply to hearings held on proposed
construction or alteration to determine its effect on the safety of
aircraft and the efficient use of navigable airspace because those
hearings are factfinding in nature. As a factfinding procedure, each
hearing is nonadversary and there are no formal pleadings or adverse