Tests for side scuttle frames, deadlights and plugs
77.—(1)  When side scuttle frames, deadlights and plugs of cast steel are intended for positions above the bulkhead deck no tests will, as a rule, 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, however, the following tests shall be made:
one frame, deadlight or plug out of every 50, 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; and
the frames and deadlights shall withstand, without fracture, being bent through an angle of 20°, and the plugs through an angle of 40°. The internal radius of the bend shall not be greater than one inch.
(3)  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.
(4)  When side scuttles of a special type are intended to be fitted, full particulars shall be submitted to the Surveyor-General of Ships who will decide the nature of the necessary tests.