US 5,668,541 AGranted

System for deriving an anomaly signal during the take-off of an aircraft

AssigneeAerospatiale Societe Nationale Industrielle

InventorsLaurent Coquin, Christine Le Draoullec

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Abstract

System for deriving an information, warning or alarm signal on board an aircraft in the event of an anomaly during take-off. According to the invention, the system comprises: means (4) for calculating the position D.sub.stop on the runway where the aircraft must stop if the pilot decides to interrupt the take-off procedure immediately, that is to say representative of the stopping distance of the aircraft during the acceleration phase of the latter at take-off; means (5) for comparing D.sub.stop to the length of runway L available so as to determine whether an interruption of the take-off is still possible.

Claims8

Dependent claims

A system for deriving an information, warning or alarm signal on board an aircraft in the event of an anomaly during take-off, before the aircraft reaches a critical rolling speed up to which the take-off process may be modified or interrupted and beyond which the take-off must be proceeded with, of the type including:

(i) first means (1) for calculating the expression:
D.sub.1 =D.sub.1 t+(Vat.sup.2 -V.sub.11 t.sup.2)/2.gamma..sub.1 t
in which:
.gamma..sub. t is the actual acceleration of the aircraft at the instant t,
V.sub.11 t is the actual speed of the aircraft at the instant t,
Vat is the theoretical speed of the aircraft at the instant t,
D.sub.1 t is the actual distance travelled by the aircraft at the instant t, and
D.sub.1 is the anticipated actual distance travelled by the aircraft when V.sub.11 t will be equal to Vat, as well as the ratio:
D.sub.1 Dat
in which:
D.sub.1 is as defined above, and
Dat is the theoretical distance travelled by the aircraft at the instant t;
(ii) (b) first means (2) for comparing the ratio D.sub.1 Dat to a predetermined threshold S;
and
(iii) information, warning or alarm means (3);
characterized in that it furthermore comprises:
(iv) second means (4) for calculating the expression:
D.sub.stop =D.sub.1 t+V.sub.11 t(.DELTA.T1+.DELTA.T2)-1/.gamma.P[.gamma.ct65 P(1n.vertline..gamma.ct.vert line.-1)+V.sub.11 t1n.vertline..gamma.bt.vertline.-bt/.gamma.P(1n.vertline..gamma.bt.vertlin e.-1)]
in which, in addition to the parameters already defined hereinabove:
.DELTA.T1 is the reaction time of the aircraft's pilot,
.DELTA.T2 is the response time of the braking means,
.gamma.bt is the acceleration of the aircraft at the start of braking,
.gamma.ct is the acceleration of the aircraft at the end of braking,
.gamma.P=(.gamma.bt-.gamma.ct)/V.sub.11 t,
D.sub.stop represents the position on the runway where the aircraft must stop if the pilot decides to interrupt the take-off procedure immediately, that is to say is representative of the stopping distance of the aircraft during the acceleration phase of the latter at take-off;
(v) second means (5) for comparing D.sub.stop to the length of runway L available so as to determine whether an interruption of the take-off is still possible;
(vi) said information, warning or alarm means (3) being activated depending on the information supplied by said first (2) and second (5) comparison means in order to enable the pilot to decide whether he should continue the take-off procedure or not.

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Dependencies are inferred from the claim text.

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Abstract

(i) first means (1) for calculating the expression:
D.sub.1 =D.sub.1 t+(Vat.sup.2 -V.sub.11 t.sup.2)/2.gamma..sub.1 t
in which:
.gamma..sub. t is the actual acceleration of the aircraft at the instant t,
V.sub.11 t is the actual speed of the aircraft at the instant t,
Vat is the theoretical speed of the aircraft at the instant t,
D.sub.1 t is the actual distance travelled by the aircraft at the instant t, and
D.sub.1 is the anticipated actual distance travelled by the aircraft when V.sub.11 t will be equal to Vat, as well as the ratio:
D.sub.1 Dat
in which:
D.sub.1 is as defined above, and
Dat is the theoretical distance travelled by the aircraft at the instant t;
(ii) (b) first means (2) for comparing the ratio D.sub.1 Dat to a predetermined threshold S;
and
(iii) information, warning or alarm means (3);
characterized in that it furthermore comprises:
(iv) second means (4) for calculating the expression:
D.sub.stop =D.sub.1 t+V.sub.11 t(.DELTA.T1+.DELTA.T2)-1/.gamma.P[.gamma.ct65 P(1n.vertline..gamma.ct.vert line.-1)+V.sub.11 t1n.vertline..gamma.bt.vertline.-bt/.gamma.P(1n.vertline..gamma.bt.vertlin e.-1)]
in which, in addition to the parameters already defined hereinabove:
.DELTA.T1 is the reaction time of the aircraft's pilot,
.DELTA.T2 is the response time of the braking means,
.gamma.bt is the acceleration of the aircraft at the start of braking,
.gamma.ct is the acceleration of the aircraft at the end of braking,
.gamma.P=(.gamma.bt-.gamma.ct)/V.sub.11 t,
D.sub.stop represents the position on the runway where the aircraft must stop if the pilot decides to interrupt the take-off procedure immediately, that is to say is representative of the stopping distance of the aircraft during the acceleration phase of the latter at take-off;
(v) second means (5) for comparing D.sub.stop to the length of runway L available so as to determine whether an interruption of the take-off is still possible;
(vi) said information, warning or alarm means (3) being activated depending on the information supplied by said first (2) and second (5) comparison means in order to enable the pilot to decide whether he should continue the take-off procedure or not.

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