Induction System Screens. § 23.1111 Turbine Engine Bleed Air Sys- Tem

Federal Aviation Administration, DOT § 23.1121

requiring fireproof or fire resistant ma- § 23.1109 Turbocharger bleed air sys- terials; and tem. (4) Constructed of materials that will The following applies to not absorb or trap hazardous quantities turbocharged bleed air systems used of flammable fluids that could be ig- for cabin pressurization: nited by a surge or reverse-flow condi- (a) The cabin air system may not be tion. subject to hazardous contamination (f) Induction system ducts that sup- following any probable failure of the ply air to a cabin pressurization sys- turbocharger or its lubrication system. tem must be suitably constructed of (b) The turbocharger supply air must material that will not produce haz- be taken from a source where it cannot ardous quantities of toxic gases or iso- be contaminated by harmful or haz- lated to prevent hazardous quantities ardous gases or vapors following any of toxic gases from entering the cabin probable failure or malfunction of the during a powerplant fire. engine exhaust, hydraulic, fuel, or oil [Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as system. amended by Amdt. 23–7, 34 FR 13095, Aug. 13, [Amdt. 23–42, 56 FR 354, Jan. 3, 1991] 1969; Amdt. 23–43, 58 FR 18974, Apr. 9, 1993]

§ 23.1105 Induction system screens. § 23.1111 Turbine engine bleed air system. If induction system screens are For turbine engine bleed air systems, used— the following apply: (a) Each screen must be upstream of (a) No hazard may result if duct rup- the carburetor or fuel injection system. ture or failure occurs anywhere be- (b) No screen may be in any part of tween the engine port and the airplane the induction system that is the only unit served by the bleed air. passage through which air can reach (b) The effect on airplane and engine the engine, unless— performance of using maximum bleed (1) The available preheat is at least air must be established. 100 °F.; and (c) Hazardous contamination of cabin (2) The screen can be deiced by heat- air systems may not result from fail- ed air; ures of the engine lubricating system. (c) No screen may be deiced by alco- hol alone; and [Amdt. 23–7, 34 FR 13095, Aug. 13, 1969, as (d) It must be impossible for fuel to amended by Amdt. 23–17, 41 FR 55465, Dec. 20, strike any screen. 1976] [Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30 EXHAUST SYSTEM FR 258, Jan. 9, 1996, as amended by Amdt. 23– 51, 61 FR 5137, Feb. 9, 1996] § 23.1121 General. For powerplant and auxiliary power § 23.1107 Induction system filters. unit installations, the following If an air filter is used to protect the apply— engine against foreign material par- (a) Each exhaust system must ensure ticles in the induction air supply— safe disposal of exhaust gases without (a) Each air filter must be capable of fire hazard or carbon monoxide con- withstanding the effects of tempera- tamination in any personnel compart- ture extremes, rain, fuel, oil, and sol- ment. vents to which it is expected to be ex- (b) Each exhaust system part with a posed in service and maintenance; and surface hot enough to ignite flammable (b) Each air filter shall have a design fluids or vapors must be located or feature to prevent material separated shielded so that leakage from any sys- from the filter media from interfering tem carrying flammable fluids or va- with proper fuel metering operation. pors will not result in a fire caused by [Doc. No. 26344, 58 FR 18974, Apr. 9, 1993, as impingement of the fluids or vapors on amended by Amdt. 23–51, 61 FR 5137, Feb. 9, any part of the exhaust system includ- 1996] ing shields for the exhaust system.

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