821
Federal Aviation Administration, DOT
§ 29.1521
(2) The minimum rotational speed
shown under the rotor speed require-
ments in § 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 trans-
mission with all engines operating;
(6) The maximum allowable power or
torque for each engine, considering the
power input limitations of the trans-
mission with one engine inoperative;
and
(7) The maximum allowable tempera-
tures for—
(i) The cylinder head or coolant out-
let (for reciprocating engines);
(ii) The engine oil; and
(iii) The transmission oil.
(d)
Fuel grade or designation. The min-
imum fuel grade (for reciprocating en-
gines) 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 paragraphs (b) and (c) of
this section.
(e)
Ambient temperature. Ambient
temperature limitations (including
limitations for winterization installa-
tions if applicable) must be established
as the maximum ambient atmospheric
temperature at which compliance with
the cooling provisions of §§ 29.1041
through 29.1049 is shown.
(f)
Two and one-half minute OEI power
operation. Unless otherwise authorized,
the use of 2
1
⁄
2
-minute OEI power must
be limited to engine failure operation
of multiengine, turbine-powered rotor-
craft for not longer than 2
1
⁄
2
minutes
for any period in which that power is
used. The use of 2
1
⁄
2
-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 dur-
ing the type tests;
(2) The maximum allowable gas tem-
perature;
(3) The maximum allowable torque;
and
(4) The maximum allowable oil tem-
perature.
(g)
Thirty-minute OEI power operation.
Unless otherwise authorized, the use of
30-minute OEI power must be limited
to multiengine, turbine-powered rotor-
craft 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 dur-
ing the type tests;
(2) The maximum allowable gas tem-
perature;
(3) The maximum allowable torque;
and
(4) The maximum allowable oil tem-
perature.
(h)
Continuous OEI power operation.
Unless otherwise authorized, the use of
continuous OEI power must be limited
to multiengine, turbine-powered rotor-
craft 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 dur-
ing the type tests.
(2) The maximum allowable gas tem-
perature;
(3) The maximum allowable torque;
and
(4) The maximum allowable oil tem-
perature.
(i)
Rated 30-second OEI power oper-
ation. Rated 30-second OEI power is
permitted only on multiengine, tur-
bine-powered rotorcraft, also certifi-
cated for the use of rated 2-minute OEI
power, and can only be used for contin-
ued operation of the remaining en-
gine(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 detectable by the applicable in-
spections and other related procedures
furnished in accordance with Section
A29.4 of appendix A of this part and
Section A33.4 of appendix A of part 33.
The use of 30-second OEI power must be
limited to not more than 30 seconds for
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