Text in force at CS25-28: from CS25-18, effective 24 Jun 2016.
(See AMC 25.609) Each part of the structure must -
(a) Be suitably protected against deterioration or loss of strength in service due to any cause, including –
(1) Weathering;
(2) Corrosion; and
(3) Abrasion; and
(b) Have provisions for ventilation and drainage where necessary for protection.
ED Decision 2016/010/R · Source