JAR 25.121 Climb: one-engine-inoperative
(See ACJ 25.121)
(a) Take-off; landing gear extended. (See
ACJ 25.121(a).) In the critical take-off
configuration existing along the flight path
(between the points at which the aeroplane
reaches VLOF and at which the landing gear is
fully retracted) and in the configuration used in
JAR 25.111 but without ground effect, the steady
gradient of climb must be positive for two-engined
aeroplanes, and not less than 0·3% for
three-engined aeroplanes or 0·5% for four-engined
aeroplanes, at VLOF and with –
(1) The critical engine inoperative and
the remaining engines at the power or thrust
available when retraction of the landing gear is
begun in accordance with JAR 25.111 unless
there is a more critical power operating
condition existing later along the flight path
but before the point at which the landing gear
is fully retracted (see ACJ 25.121(a)(1)); and
(2) The weight equal to the weight
existing when retraction of the landing gear is
begun determined under JAR 25.111.
(b) Take-off; landing gear retracted. In the
take-off configuration existing at the point of the
flight path at which the landing gear is fully
retracted, and in the configuration used in JAR
25.111 but without ground effect, the steady
gradient of climb may not be less than 2·4% for
two-engined aeroplanes, 2·7% for three-engined
aeroplanes and 3·0% for four-engined aeroplanes,
at V2 and with –
(1) The critical engine inoperative, the
remaining engines at the take-off power or
thrust available at the time the landing gear is
fully retracted, determined under JAR 25.111,
unless there is a more critical power operating
condition existing later along the flight path
but before the point where the aeroplane
reaches a height of 400 ft above the take-off
surface (see ACJ 25.121(b)(1)) ; and
(2) The weight equal to the weight
existing when the aeroplane’s landing gear is
fully retracted, determined under JAR 25.111.
(c) Final take-off. In the en-route
configuration at the end of the take-off path
determined in accordance with JAR 25.111, the
steady gradient of climb may not be less than
1·2% for two-engined aeroplanes, 1·5% for three-engined
aeroplanes, and 1·7% for four-engined
1 [aeroplanes, at VFTO and with –]
(1) The critical engine inoperative and
the remaining engines at the available
maximum continuous power or thrust; and
(2) The weight equal to the weight
existing at the end of the take-off path,
determined under JAR 25.111.
1 [(d) Approach. In a configuration
corresponding to the normal all-engines-operating
procedure in which VSR for this configuration
does not exceed 110% of the VSR for the related
all-engines-operating landing configuration, the
steady gradient of climb may not be less than
2·1% for two-engined aeroplanes, 2·4% for three-]
engined aeroplanes and 2·7% for four-engined
aeroplanes, with –
[(1) The critical engine inoperative, the
remaining engines at the go-around power or
thrust setting; ]
(2) The maximum landing weight;
(3) A climb speed established in
connection with normal landing procedures,
but not more than 1·4 VSR; and
(4) Landing gear retracted.]
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