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

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

1996-05-09

1997-09-16

Mullen, Thomas

Communications: electrical

Aircraft alarm or indicating systems

Takeoff indicator

340972, 701 15, G08B 2100

Patent

active

056685416

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a system for deriving an information, warning or alarm signal on board an aircraft in the event of an anomaly during take-off.
The take-off procedure, from releasing the brakes until the aircraft lifts off, constitutes a sensitive phase in the operation of the aircraft, during which, owing to losses of performance, changes as far as the direction and the strength of the wind are concerned, or for other reasons, accidents or incidents, the probability of which has been evaluated at about 10.sup.-6 per take-off, may take place. In consequence, it is necessary, in order to enhance safety, to supply the crew, in good time, with reliable and precise information allowing them to decide whether the take-off procedure should be interrupted or corrected, and to do so before the aircraft, rolling on the runway, reaches a critical speed V1, obtained by a theoretical calculation, defined as the speed up to which the take-off may be interrupted and beyond which the take-off must be proceeded with.
Already known, from the Applicant's Patent FR-2,650,101, is such 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 procedure may be modified or interrupted and beyond which the take-off must be proceeded with, which includes: t, t, and V.sub.11 t will be equal to Vat, t; means for comparing the ratio D.sub.1 Dat to a predetermined threshold S guaranteeing a minimum safety distance, especially for the braking and stopping of the aircraft; and warning or alarm signal when said ratio D.sub.1 /Dat is above or equal to said threshold.
The system of Patent FR-2,650,101 thus makes it possible to derive an information, warning or alarm signal on board an aircraft in the event of an anomaly during take-off. This signal is only supplied when the speed of the airplane and the distance which it has travelled along the runway are, respectively, less than the decision speed (critical speed V1) and less than the theoretical distance travelled with which it is associated, in order to allow, if necessary, an interruption of the take-off in complete safety.
However, with such a system, the transition between the moment when an interruption of the take-off is still possible and the moment when it is no longer possible is very sudden. At a given instant, the system no longer supplies information to the aircraft's pilot.
However, the pilot does not know exactly when this transition will occur. Moreover, in the event of a problem, the pilot does not know at any moment the braking margin that he has available.
By way of example, we will assume that an alarm occurs before V1. By definition, an interruption of the take-off is still possible. The aircraft has not yet reached the critical speed and the actual distance travelled by the aircraft is not yet greater, by more than the predefined threshold (for example 15%), than the theoretical distance which it ought to have travelled. However, it will very soon be so since an alarm has been triggered. If the pilot does not react immediately, nothing will guarantee that he will be able actually to stop the aircraft within the limit of distances available.
The object of the present invention is to avoid these drawbacks and relates to a system, of the previously defined type, which is improved in order to supply the pilot with new information enabling him to refine his judgement as to continuing, or not, the take-off procedure in the event of an anomaly.
For this purpose, the 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: t, t, and V.sub.11 t will be equal to Vat, as well as the ratio: by the aircraft at the instant t; threshold S; and comprises: t(.DELTA.T

REFERENCES:
patent: 3034096 (1962-05-01), Craddock
patent: 3120658 (1964-02-01), Lukesh et al.
patent: 3368065 (1968-02-01), Kendall
patent: 4454582 (1984-06-01), Cleary et al.
patent: 4638437 (1987-01-01), Cleary et al.
patent: 4773015 (1988-09-01), Leland et al.
patent: 4843554 (1989-06-01), Middleton et al.
patent: 5047942 (1991-09-01), Middleton et al.
patent: 5124700 (1992-06-01), Bonafe 340959
"Evaluation of a Takeoff Performance Monitoring System Display", Middleton et al. J. Guidance, V.12, No. 3, pp. 640-646.
"System Predicts Critical Runway Performance Paremeters", Millen, et al., NASA Tech Brief, p. 292.

Affiliated with

Also associated with

Rating

System for deriving an anomaly signal during the take-off of an does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for deriving an anomaly signal during the take-off of an , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for deriving an anomaly signal during the take-off of an will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-221511