§29.1521 Powerplant limitations

(a) General. Th e powerplant limitations prescribed in this paragraph must be established so that they do not exceed the corresponding lim its for which the engines are type certificated. (b) Take-off operation. The powerpl ant take-off operation must be limited by: (1) The maximum r otational s peed, which may not be greater than: (i) T he maximum value determined by the rotor design; or (ii) The m aximum val ue shown during the type tests; (2) The ma ximum a llowable manifold pressure (for reciprocating engines); (3) The maximum allowable turbine inlet or tu rbine o utlet g as tem perature (fo r turbine engines); (4) The m aximum al lowable power or torque for each engine, considering the power input limitations of t he t ransmission wi th al l engines operating; (5) The m aximum al lowable power or torque for each engine considering the power input l imitations of t he transmission with one engine inoperative; (6) The tim e lim it fo r th e u se of the power correspondi ng t o t he limitations established in sub-paragraphs (b)(1) to (5); and (7) If th e tim e lim it estab lished in su b-paragraph (b)(6) exceeds 2 minutes: (i) The ma ximum a llowable cylinder head or cool ant out let temperature (for reci procating engi nes); and (ii) The ma ximum a llowable engine and transmission oil temperatures. (c) Continuous operation. The cont inuous operation must be limited by: (1) The maximum r otational s peed, which may not be greater than: (i) T he maximum value determined by the rotor design; or (ii) The m aximum val ue shown during the type tests; (2) The mi nimum r otational speed shown under t he rot or speed requi rements i n CS 29.1509(c); (3) The ma ximum a llowable manifold pressure (for reciprocating engines); (4) The maximum allowable turbine inlet or tu rbine o utlet g as tem perature (fo r turbine engines); (5) The m aximum al lowable power or torque for each engine, considering the power input limitations of t he t ransmission wi th al l engines operating; (6) The m aximum al lowable power or torque for each engine, considering the power input l imitations of t he transmission with one engine inoperative; and (7) The ma ximum a llowable temperatures for – (i) The cylinder head or coolant outlet (for reciprocating engines); (ii) The engine oil; and (iii) The transmission oil. (d) Fuel grade or designation. T he mi nimum fuel grade (for reci procating engi nes) or fuel designation (for turbine engines) must be established so th at it is n ot less th an th at req uired for the operation o f th e en gines with in th e lim itations in sub-paragraphs (b) and (c) . (e) Ambient Ambient temperature. temperature lim itations (in cluding lim itations fo r winterization in stallations if ap plicable) must be established as the m aximum am bient atmospheric temperature at which compliance with the cooling provisions of CS 29.1041 to 29.1049 is shown. (f) Two and one-half minute OEI power operation. Unl ess ot herwise aut horised, t he use of 2½-minute OEI power m ust be l imited t o engine failure operation of m ulti-engine, tu rbine p owered rotorcraft for not l onger t han 2½ minutes for any period in which that power is used. The use of 2½- minute OEI power must also be limited by: (1) The maximum r otational s peed, which may not be greater than: (i) T he maximum value determined by the rotor design; or (ii) The m aximum val ue shown during the type tests; (2) The ma ximum a llowable g as temperature; (3) The maximum allowable torque; and (4) The ma ximum a llowable oil temperature. (g) Thirty-minute OEI power operation. Unless otherwise authorised, the use of 30-minute OEI p ower m ust b e lim ited to multi-engine, turbine-powered rotorcraft for not l onger t han 30 minutes aft er fai lure of an engi ne. The use of 30-minute OEI power must also be limited by: (1) The maximum r otational s peed, which may not be greater than: (i) T he maximum value determined by the rotor design; or (ii) The m aximum val ue shown during the type tests; (2) The ma ximum a llowable g as temperature; (3) The maximum allowable torque; and (4) The ma ximum a llowable oil temperature. (h) Continuous OEI power operation. Unless otherwise aut horised, t he use of cont inuous OEI power m ust b e lim ited to multi-engine, turbine-powered rotorcraft for continued fl ight aft er failure of an engi ne. The use of cont inuous OEI power must also be limited by: (1) The maximum r otational s peed, which may not be greater than: (i) T he maximum value determined by the rotor design; or (ii) The m aximum val ue shown during the type tests. (2) The ma ximum a llowable g as temperature; (3) The maximum allowable torque; and (4) The ma ximum a llowable oil temperature. (i) Rated 30-second OEI power operation. Rated 30-second OEI power is perm itted only on multi-engine, turbine-powered ro torcraft also certificated for the use of rated 2-m inute OEI power, and can onl y be used for cont inued operation of the remaining engine(s) after a failure or precautionary shutdown of an engine. It must be shown t hat fol lowing appl ication of 30-second OEI power, any damage will be readily detectable by t he appl icable i nspections and ot her rel ated procedures furnished in accordance with paragraph A29.4 of Appendi x A of CS–29. The use of 30-second OEI power m ust be l imited t o not more than 30 seconds for any period in which the power is used and by: (1) The maximum r otational s peed which may not be greater than: (i) T he maximum value determined by the rotor design: or (ii) T he maximum value demonstrated during the type tests; (2) The ma ximum a llowable g as temperature; and (3) The maximum allowable torque. (j) Rated 2-minute OEI power operation. Rated 2 -minute OEI p ower is p ermitted o nly on multi-engine, turbine-powered ro torcraft, also certificated for the use of rat ed 30-second OEI power, and can only be used for cont inued operation of the remaining engine(s) after a failure or precautionary shutdown of an engine. It m ust be shown that following application of 2-m inute OEI power, any damage will b e read ily d etectable b y th e applicable i nspections and ot her rel ated procedures furnished in accordance with paragraph A29.4 of Appendix A of C S–29. The use of 2-minute OEI power must be limited t o not more t han 2 minutes for any period in which that power is used, and by: (1) The maximum r otational s peed, which may not be greater than: (i) T he maximum value determined by the rotor designs; or (ii) T he maximum value demonstrated during the type tests; (2) The ma ximum a llowable g as temperature; and (3) The maximum allowable torque.