Patent US2689116A successfully refreshed from Google Patents.
US4354237A
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US
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Method and apparatus for producing an aircraft flare path control signal
Assignee: Boeing Co
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Filing: 1980-06-24
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Granted: 1982-10-12
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Expires: 2000-06-24
Abstract
Abstract Aircraft altitude, ground velocity, and altitude rate signals are input to a computer which, using a unique control law, generates a pitch control surface command signal suitable for guiding an aircraft on its flare path to a specified runway touchdown point despite varying wind conditions.
Inventors
- 👤 Antonius A. Lambregts
- 👤 Rolf Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:23
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0676
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
Apparatus for producing an aircraft flare path control signal comprising: means for producing a signal h representative of aircraft altitude; means for producing a signal V G representative of aircraft groundspeed; means for producing a signal h representative of aircraft altitude rate; computer means for producing a pitch control surface command signal δ e .sbsb.c according to the relationship: δ.sub.e.sbsb.c =K.sub.h {h+V.sub.G [(K.sub.h /K.sub.h)/V.sub.G REF ](h+h.sub.B)} where K h , K h , V G REF and h B are constants selected for a given system configuration; and control means for actuating the aircraft control surfaces to track said command signal δ e .sbsb.c whereby aircraft landing flare distance is substantially unaffected by the aircraft's relative groundspeed.
Claim 2
Dependent Claim
117 words
Apparatus for producing an aircraft flare path control signal comprising: means for producing a signal h representative of aircraft altitude; means for producing a signal V G representative of aircraft groundspeed; means for producing a signal h representative of aircraft altitude rate; computer means for producing a pitch control surface command signal δ e .sbsb.c according to the relationship: δ.sub.e.sbsb.c =K.sub.h {h+V.sub.G [(K.sub.h /K.sub.h)/V.sub.G REF ](h+h.sub.B)} where K h , K h , V G REF and h B are constants selected for a given system configuration; and control means for actuating the aircraft control surfaces to track said command signal δ e .sbsb.c whereby aircraft landing flare distance is substantially unaffected by the aircraft's relative groundspeed.
Claim 3
Independent Claim
114 words
A method for producing an aircraft flare path control signal comprising the steps of: (a) producing a signal h representative of aircraft altitude; (b) producing a signal V G representative of aircraft groundspeed; (c) producing a signal h representative of aircraft altitude rate; (d) computing a pitch control surface command signal δ e .sbsb.c according to the relationship: δ.sub.e.sbsb.c =K.sub.h {h+V.sub.G [(K.sub.h /K.sub.h)/V.sub.G REF ](h+h.sub.B)} where K h , K h , V G REF and h B are constants selected for a given system configuration; and (e) actuating the aircraft control surfaces to track said command signal δ e .sbsb.c whereby aircraft landing flare distance is substantially unaffected by the aircraft's relative groundspeed.
Claim 4
Independent Claim
114 words
A method for producing an aircraft flare path control signal comprising the steps of: (a) producing a signal h representative of aircraft altitude; (b) producing a signal V G representative of aircraft groundspeed; (c) producing a signal h representative of aircraft altitude rate; (d) computing a pitch control surface command signal δ e .sbsb.c according to the relationship: δ.sub.e.sbsb.c =K.sub.h {h+V.sub.G [(K.sub.h /K.sub.h)/V.sub.G REF ](h+h.sub.B)} where K h , K h , V G REF and h B are constants selected for a given system configuration; and (e) actuating the aircraft control surfaces to track said command signal δ e .sbsb.c whereby aircraft landing flare distance is substantially unaffected by the aircraft's relative groundspeed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |