Text in force at CAR3R-8: from CAR3R-0, effective 15 May 1956. OCR text
(a) The method of supporting tanks shall not be such as to concentfate the loads resulting from the weight of the fuel in the tanks. Pads shall be provided to prevent chafing between the tank and its supports. Materials employed for padding shall be nonabsorbent or shall be treated to prevent the absorption of fuels. If flexible tank liners are employed, they shall be of an approved type, and they sha.l be so supported that the liner is not required to withstand fluid loads. Interior surfaces of compartments for such liners shall be smooth anc free of projections which are apt to cause wear of the liner, unless provisions are made for the protection of the liner at such points cr unless the construction of the liner itself provides such protection. A positive pressure shall be maintained within the vapor space of all bladder celis under all conditions of operation including the critical condition of low air speed and rate of descent likely to be encountered in normal operation.
(b) Tank compartments shall be ventilated and drained to prevent ‘he accumulation of inflammable fluids or yapors. Compartments adjacent to tanks which are an integra! pars uf the airplane structure shall also be ventilated and drained.
(c) Fuel tanks shall not be located on the engine side of the fire wall. Not less than one-half inch of clear air space shall be provided between the fuel tank and the fire wall. No portion of engine nacelle skin which lies immediately behind a major air egress opening from the engine compartment shall act as the wall of an integral tank. Fuel tanks shall not be located in personnel compartments, except in the case of singleengine airplanes. In such cases fuel tanks the capacity of which does not exceed 25 gallons may be located in personnel compartments, if adequate ventilation and drainage are provided. In all other cases, fuel tanks shall be tsolated from personnel compartments by means of fume and fuel proof enclosures