Text in force at CAR3R-8: from CAR3R-2, effective 12 Aug 1957. OCR text
The provisions of paragraphs (a) through (d) of this section shall apply to pressurized compartments, — (a) The airplane structure shall have sufficient strength to withstand the flight loads combined with pressure differential loads from zero up to the maximum relief valve setting. Account shall be taken of the external pressure distribution in flight. Stress concentrations shall be taken into account in the design of the pressurized structure, (See § 3.270.) (b)If landings are to be permitted with the cabin pressurized, landing loads shall be com~ bined with pressure differential loads from zero up to the maximum permitted during landing. (c) The airplane structure shall have sufficient strength to withstand the pressure differential loads corresponding with the maximum relief valve setting multiplied by a factor of 1.33. It shall be acceptable to eliminate all other loads in this case. (ad) Where a pressurized cabin is separated into 2 or more compartments by bulkheads or floor, the primary structure shall be designed for the effects of sudden release of pressure in any compartment having external doors or windows. This condition shall be investigated for the effects resulting from the failure of the largest opening in a compartment. Where intercompartment venting is provided, it shall be acceptable te take into account the effects of such venting. 5. By amending # 3.211 by adding at the end thereof a note to read as follows:
secs. 601, 603, 52 Stat. 1007, 1009, as amended; 49 U.S.C. 551, 553) . By the Civil Aeronautics Boards /e/ H.C, Mulligan (SEAL) M,C. Mulligan Fart 3 last printed May 15, 1956. Secretary ·