Tests for side scuttle frames, deadlights and plugs
81.—(1)  When side scuttle frames, deadlights and plugs of malleable cast-iron are intended for positions above the bulkhead deck no tests shall be necessary unless a surveyor of ships has reasons to doubt the quality and strength of the material.
(2)  When intended for positions below the bulkhead deck, but not less than 6 inches above the load line, the following tests shall be made:
one frame, deadlight or plug out of every 25, and at least one of each for every ship so fitted, shall be selected at random and tested to destruction by being bent, when cold and before being machined, either in a press or by blows;
the frames shall withstand, without fracture, being bent through an angle of 20°, and deadlights and plugs through an angle of 40°; and
the internal radius of the bends shall in no case exceed one inch.
(3)  In addition to the tests required by paragraph (2) each article must satisfactorily withstand being dropped on an iron slab from a height of 10 feet for frames and 15 feet for deadlights and plugs.
(4)  If a surveyor of ships is of opinion that owing to the unusual depth of projecting rims, or for any other reason, the above test for frames and deadlights cannot be fairly applied, an alternative method of testing may be submitted to the Surveyor-General of Ships for approval before the tests are commenced.