§29.1121 General

For p owerplant an d au xiliary power unit installations the following apply: (a) Each exhaust system m ust ensure safe disposal of exhaust gase s without fire hazard or carbon monoxide contamination i n any personnel compartment. (b) Each exhaust system part with a surface hot enough to i gnite fl ammable fl uids or vapours must b e lo cated o r shielded so that leakage from any system carrying fl ammable fl uids or vapours will not result in a fire cau sed by impingement of the fl uids or vapours on any part of the exhaust system including shields for the exhaust system. (c) Each com ponent upon whi ch hot exhaust gases could impinge, or t hat could be subjected to high temperatures from exhaust system parts, must be fireproof. Each exhaust sy stem com ponent must be separat ed by a fi reproof shi eld from adjacent parts of the rotorcraft that are outside the engine and auxiliary power unit compartments. (d) No exhaust gases m ay di scharge so as t o cause a fire hazard with respect to any flammable fluid vent or drain. (e) No exhaust gases m ay di scharge where they will cau se a g lare seriously affecting pilot vision at night. (f) Each exhaust sy stem com ponent m ust be ventilated to p revent p oints o f ex cessively h igh temperature. (g) Each exhaust shroud must be ventilated or insulated t o avoi d, duri ng norm al operat ion, a temperature hi gh enough t o i gnite any flammable fluids or vapours outside the shroud. (h) If significant traps exist, each turbine engine exhaust sy stem m ust have drai ns discharging clear of the rot orcraft, i n any norm al ground and flight attitudes, to prevent fuel accumulation after the failure of an attem pted engine start.