(4) IMO Revised recommendation on testing. Each prototype lifeboat of each design must pass each of the tests for davit-launched or free-fall lifeboats, as applicable, described in the IMO Revised recommendation on testing, part 1, paragraphs 6.1 through 6.17 (incorporated by reference, see § 160.135-5 of this subpart). Tests must be conducted in accordance with these paragraphs of IMO Revised recommendation on testing, Part 1, with the following modifications:
(i) Fire retardancy/release mechanism and engine tests (Paragraphs 1/6.2, 6.9, 6.10, 6.14). The tests in the following IMO Revised recommendation on testing paragraphs may be accomplished independent of the lifeboat, and may be considered completed and need not be repeated if the tests have been previously shown to meet the necessary requirements—
- (A) Paragraph 6.2;
- (B) Paragraphs 6.9.3 through 6.9.6;
- (C) Paragraph 6.10.2 through 6.10.6; and
- (D) Paragraphs 6.14.6 through 6.14.8.
- (ii) Lifeboat overload test (Paragraph 1/6.3). For a davit launched lifeboat, the overload test must be conducted with the lifeboat suspended from the lifting hooks. During this test, the canopy of a free-fall lifeboat must not deform so as to harm any potential occupants.
- (iii) Impact test (Paragraph 1/6.4). The rigid vertical surface must not be displaced or deformed as a result of the test.
- (iv) Lifeboat seating space test (Paragraph 1/6.7). The average mass of persons used to test the lifeboat seating space must be determined by weighing as a group or individually. Each person must wear an inherently buoyant SOLAS lifejacket with at least 150 N of buoyancy or a Coast Guard-approved lifejacket approved under approval series 160.155. For other than a totally enclosed lifeboat, the operator(s) must demonstrate that the lifeboat can be operated while wearing a Coast Guard approved, insulated-buoyant immersion suit approved under approval series 160.171. The Commandant will give consideration to requests to test at, and designate lifeboats for, a heavier occupant weight than that stated in the IMO LSA Code, Chapter IV (incorporated by reference, § 160.135-5 of this subpart).
- (v) Flooded stability test (Paragraph 1/6.8). Any materials used to raise the test weights representing the lifeboat occupants above the seat pan must be at least as dense as fresh water.
- (vi) Lifeboat operational test, Operation of engine (Paragraph 1/6.10.1). For the 4-hour lifeboat maneuvering period, the lifeboat must not (except for a short period to measure towing force and to demonstrate towing fixture durability) be secured, and must be run through its full range of speeds and full range of all controls throughout the period.
- (vii) Survival recovery test (Paragraph 1/6.10.8). The recovery demonstration must show that no more than two crewmembers are required to recover a helpless person of ninety-fifth percentile by weight described in ASTM F 1166 (incorporated by reference, see § 160.135-5 of this subpart) while the crewmembers and helpless person are each wearing a lifejacket.
- (viii) Flooded capsizing test (Paragraph 1/6.14.3-.5). For any lifeboat also approved as a rescue lifeboat, the lifeboat must return to an upright position and, without undue delay, the crew must be able to use the lifeboat again as a lifeboat.
- (ix) Fire test (Paragraph 1/6.16.4). The locations where temperatures are measured along with the rationale for the proposed locations must be provided to the Commandant for approval prior to the testing.
- (x) Water spray tests (Paragraph 1/6.16.9). The delivery rate of water, or the sprayed water film thickness over the lifeboat, must be at least equivalent to that used to achieve passing results for the fire test. Full coverage must be obtained without the need to rock the lifeboat or induce wetting by wiping or applying any agent.
- (xi) Measuring and evaluating acceleration forces (Paragraph 1/6.17.5). For free-fall lifeboats, the selection, placement, and mounting of the accelerometers along with the rationale for the proposed selection, placement, and mounting must be provided to the Commandant for approval prior to the testing.
- (xii) Evaluation acceleration forces with the dynamic response model (Paragraph 1/6.17.9). For free-fall lifeboats only, sections 6.17.9 thru 6.17.12 must be used along with the displacement limits for lifeboats in Table 2 under “Evaluation with the dynamic response model”.