Federal Aviation Administration, DOT § 33.15

(c) For turbine engines, ratings and (15) Transient gas overtemperature, operating limitations are established and number of overtemperature occur- relating to the following: rences. (1) Horsepower, torque, or thrust, (16) Transient engine overtorque, and r.p.m., gas temperature, and time for— number of overtorque occurrences. (i) Rated maximum continuous power (17) Maximum engine overtorque for or thrust (augmented); turbopropeller and turboshaft engines (ii) Rated maximum continuous incorporating free power turbines. power or thrust (unaugmented); (iii) Rated takeoff power or thrust (18) For engines to be used in super- (augmented); sonic aircraft, engine rotor (iv) Rated takeoff power or thrust windmilling rotational r.p.m. (unaugmented); (d) In determining the engine per- (v) Rated 30-minute OEI power; formance and operating limitations, (vi) Rated 21⁄2-minute OEI power; the overall limits of accuracy of the (vii) Rated continuous OEI power; engine control system and of the nec- and essary instrumentation as defined in (viii) Rated 2-minute OEI Power; § 33.5(a)(6) must be taken into account. (ix) Rated 30-second OEI power; and (x) Auxiliary power unit (APU) mode [Amdt. 33–6, 39 FR 35463, Oct. 1, 1974, as of operation. amended by Amdt. 33–10, 49 FR 6850, Feb. 23, 1984; Amdt. 33–11, 51 FR 10346, Mar. 25, 1986; (2) Fuel designation or specification. Amdt. 33–12, 53 FR 34220, Sept. 2, 1988; Amdt. (3) Oil grade or specification. 33–18, 61 FR 31328, June 19, 1996; Amdt. 33–26, (4) Hydraulic fluid specification. 73 FR 48284, Aug. 19, 2008; Amdt. 33–30, 74 FR (5) Temperature of— 45310, Sept. 2, 2009] (i) Oil at a location specified by the applicant; § 33.8 Selection of engine power and (ii) Induction air at the inlet face of thrust ratings. a supersonic engine, including steady (a) Requested engine power and state operation and transient over- temperature and time allowed; thrust ratings must be selected by the (iii) Hydraulic fluid of a supersonic applicant. engine; (b) Each selected rating must be for (iv) Fuel at a location specified by the lowest power or thrust that all en- the applicant; and gines of the same type may be expected (v) External surfaces of the engine, if to produce under the conditions used to specified by the applicant. determine that rating. (6) Pressure of— [Amdt. 33–3, 32 FR 3736, Mar. 4, 1967] (i) Fuel at the fuel inlet; (ii) Oil at a location specified by the applicant; Subpart B—Design and (iii) Induction air at the inlet face of Construction; General a supersonic engine, including steady state operation and transient over- § 33.11 Applicability. pressure and time allowed; and This subpart prescribes the general (iv) Hydraulic fluid. design and construction requirements (7) Accessory drive torque and over- for reciprocating and turbine aircraft hang moment. engines. (8) Component life. (9) Fuel filtration. § 33.13 [Reserved] (10) Oil filtration. (11) Bleed air. § 33.15 Materials. (12) The number of start-stop stress cycles approved for each rotor disc and The suitability and durability of ma- spacer. terials used in the engine must— (13) Inlet air distortion at the engine (a) Be established on the basis of ex- inlet. perience or tests; and (14) Transient rotor shaft overspeed (b) Conform to approved specifica- r.p.m., and number of overspeed occur- tions (such as industry or military rences. specifications) that ensure their having

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