Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
(a) Each fuel t ank m ust be supported so that tank loads are not concent rated on unsupport ed tank surfaces. In addition:
(1) There must be pads, if necessary, to prevent chafing between each tank and its supports;
(2) The padding must be non-absorbent or treated to prevent the absorption of fuel;
(3) If flexible tank liners are used, they must be support ed so t hat they are not required to withstand fluid loads; and
(4) Each interior surface of tank compartments must be sm ooth and free of projections t hat coul d cau se wear of the liner, unless:
(i) There are means for protection of the liner at those points; or
(ii) The co nstruction o f th e lin er itself provides such protection.
(b) Any spaces adjacent to tank surfaces must be adequately ventilated to avoid accumulation of fuel or fumes in those spaces due to m inor leakage. If the tank is in a sealed com partment, ventilation m ay b e lim ited to drain holes that prevent cl ogging and t hat prevent excessive pressure resu lting fro m altitu de changes. If flexible tank lin ers are in stalled, th e v enting arrangement for the spaces between the liner and its container must maintain the proper relationship to t ank vent pressures for any expect ed fl ight condition.
(c) The location of each tank m ust m eet the requirements of CS 29.1185(b) and (c).
(d) No rotorcraft skin im mediately adjacent to a m ajor air o utlet from the engine com partment may act as the wall of an integral tank.
ED Decision 2003/016/RM · Source