JAR 29.1521 Powerplant limitations
(a) General. The powerplant limitations
[prescribed in this paragraph must be established]
so that they do not exceed the corresponding
limits for which the engines are type certificated.
(b) Take-off operation. The powerplant takeoff
operation must be limited by –
(1) The maximum rotational speed,
which may not be greater than –
(i) The maximum value
[determined by the rotor design; or]
(ii) The maximum value shown
during the type tests;
(2) The maximum allowable manifold
pressure (for reciprocating engines);
(3) The maximum allowable turbine
inlet or turbine outlet gas temperature (for
turbine engines);
(4) The maximum allowable power or
torque for each engine, considering the power
input limitations of the transmission with all
engines operating;
(5) The maximum allowable power or
torque for each engine considering the power
input limitations of the transmission with one
engine inoperative;
(6) The time limit for the use of the
power corresponding to the limitations
established in sub-paragraphs (b) (1) to (5) of
this paragraph; and
(7) If the time limit established in subparagraph
(b) (6) of this paragraph exceeds
2 minutes –
(i) The maximum allowable
cylinder head or coolant outlet
temperature (for reciprocating engines);
and
(ii) The maximum allowable
engine and transmission oil temperatures.
(c) Continuous operation. The continuous
operation must be limited by –
(1) The maximum rotational speed,
which may not be greater than –
(i) The maximum value
determined by the rotor design; or
(ii) The maximum value shown
during the type tests;
(2) The minimum rotational speed
shown under the rotor speed requirements in
[JAR 29.1509(c);]
(3) The maximum allowable manifold
pressure (for reciprocating engines);
(4) The maximum allowable turbine
inlet or turbine outlet gas temperature (for
turbine engines);
(5) The maximum allowable power or
torque for each engine, considering the power
input limitations of the transmission with all
engines operating;
(6) The maximum allowable power or
torque for each engine, considering the power
input limitations of the transmission with one
engine inoperative; and
(7) The maximum allowable
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. The minimum
fuel grade (for reciprocating engines) or fuel
designation (for turbine engines) must be established
so that it is not less than that required for the
operation of the engines within the limitations in subparagraphs
(b) and (c) of this paragraph.
(e) Ambient temperature. Ambient
temperature limitations (including limitations for
winterization installations if applicable) must be
established as the maximum ambient atmospheric
temperature at which compliance with the cooling
provisions of JAR 29.1041 to 29.1049 is shown.
(f) Two and one-half minute OEI power
operation. Unless otherwise authorised, the use of
2½-minute OEI power must be limited to engine
failure operation of multi-engine, turbine powered
rotorcraft for not longer than 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 rotational speed,
which may not be greater than –
(i) The maximum value
determined by the rotor design; or
(ii) The maximum value shown
during the type tests;
(2) The maximum allowable gas
temperature;
(3) The maximum allowable torque;
and
(4) The maximum allowable oil
temperature.
(g) Thirty-minute OEI power operation.
Unless otherwise authorised, the use of 30-minute
OEI power must be limited to multi-engine,
turbine-powered rotorcraft for not longer than
30 minutes after failure of an engine. The use of
30-minute OEI power must also be limited by –
(1) The maximum rotational speed,
which may not be greater than –
(i) The maximum value
determined by the rotor design; or
(ii) The maximum value shown
during the type tests;
(2) The maximum allowable gas
temperature;
(3) The maximum allowable torque;
and
(4) The maximum allowable oil
temperature.
(h) Continuous OEI power operation.
Unless otherwise authorised, the use of
continuous OEI power must be limited to multiengine,
turbine-powered rotorcraft for continued
flight after failure of an engine. The use of
continuous OEI power must also be limited by –
(1) The maximum rotational speed,
which may not be greater than –
(i) The maximum value
determined by the rotor design; or
(ii) The maximum value shown
during the type tests.
(2) The maximum allowable gas
temperature;
(3) The maximum allowable torque; and
(4) The maximum allowable oil
temperature.
(i) Rated 30-second OEI power operation.
Rated 30-second OEI power is permitted only on
multi-engine, turbine-powered rotorcraft also
certificated for the use of rated 2-minute OEI
power, and can only be used for continued
operation of the remaining engine(s) after a
failure or precautionary shutdown of an engine. It
must be shown that following application of 30-
second OEI power, any damage will be readily
1[detectable by the applicable inspections and]
other related procedures furnished in accordance
1[with paragraph A29.4 of Appendix A of
JAR–29. The use of 30-second OEI power must]
be limited to not more than 30 seconds for any
period in which the power is used and by –
(1) The maximum rotational speed
which may not be greater than –
(i) The maximum value
determined by the rotor design: or
(ii) The maximum value
demonstrated during the type tests;
(2) The maximum allowable gas
temperature; and
(3) The maximum allowable torque.
(j) Rated 2-minute OEI power operation.
Rated 2-minute OEI power is permitted only on
multi-engine, turbine-powered rotorcraft, also
certificated for the use of rated 30-second OEI
power, and can only be used for continued operation
of the remaining engine(s) after a failure or
precautionary shutdown of an engine. It must be
shown that following application of 2-minute OEI
power, any damage will be readily detectable by the
1[applicable inspections and other related procedures]
[furnished in accordance with paragraph A29.4 of]
1[Appendix A of JAR–29. The use of 2-minute OEI]
power must be limited to not more than 2 minutes
for any period in which that power is used, and by –
(1) The maximum rotational speed,
which may not be greater than –
(i) The maximum value
determined by the rotor designs; or
(ii) The maximum value
demonstrated during the type tests;
(2) The maximum allowable gas
temperature; and
(3) The maximum allowable torque.
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