US4999780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic reconfiguration of electronic landing display
Assignee: Boeing Co
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Filing: 1989-03-03
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Granted: 1991-03-12
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Expires: 2009-03-03
Abstract
Abstract Automatically reconfiguring an electronic landing display that includes a flight path vector (FPV) symbol and a rising runway symbol combined with a digital altitude value that merge at low aircraft altitudes is disclosed. During approach, when the aircraft descends below a predetermined minimum altitude, e.g., 200 feet, the FPV symbol is removed. When the aircraft is on the ground and during takeoff, the rising runway symbol is removed. Removing one or the other of the merging symbols prevents the symbols from overlapping. Thus, the potential for pilot error due to one of the merging symbols occluding the other is avoided.
Inventors
- 👤 James E. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:25
CPC Classifications
G; G01; G01C; G01C23/00; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0676
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
In an electronic flight instrument system that includes: (i) an electronic landing display that includes a flight path vector (FPV) symbol and a runway symbol that merge toward one another when an aircraft incorporating the electronic flight instrument system descends below a first predetermined altitude above a runway during a landing maneuver; and (ii) a programmable controller for controlling the position and orientation of said FPV and runway symbols of said electronic landing display, the improvement comprising: means for automatically reconfiguring the electronic landing display by removing said FPV symbol prior to said merging FPV and runway symbols overlapping and occluding one another by programming said programmable controller to remove said FPV symbol from said display when the altitude of said aircraft above said runway drops below a second predetermined value, said second predetermined value being chosen such that said FPV and runway symbols do not overlap when the altitude of said aircraft above said runway drops below said second predetermined value.
Claim 2
Dependent Claim
162 words
In an electronic flight instrument system that includes: (i) an electronic landing display that includes a flight path vector (FPV) symbol and a runway symbol that merge toward one another when an aircraft incorporating the electronic flight instrument system descends below a first predetermined altitude above a runway during a landing maneuver; and (ii) a programmable controller for controlling the position and orientation of said FPV and runway symbols of said electronic landing display, the improvement comprising: means for automatically reconfiguring the electronic landing display by removing said FPV symbol prior to said merging FPV and runway symbols overlapping and occluding one another by programming said programmable controller to remove said FPV symbol from said display when the altitude of said aircraft above said runway drops below a second predetermined value, said second predetermined value being chosen such that said FPV and runway symbols do not overlap when the altitude of said aircraft above said runway drops below said second predetermined value.
Claim 3
Dependent Claim
45 words
The improvement claimed in claim 1 including a radar altitude value associated with said runway symbol such that said radar altitude value would be occluded by said FPV symbol if said FPV symbol were allowed to overlap said runway symbol and said radar altitude value.
Claim 4
Dependent Claim
35 words
The improvement claimed in claim 2 wherein said runway symbol and said radar altitude value rise toward said FPV symbol when the altitude of said aircraft above said runway drops below said first predetermined value.
Claim 5
Dependent Claim
27 words
The improvement claimed in claim 3, wherein said runway signal and said radar altitude value are removed from said display when said aircraft is on the ground.
Claim 6
Dependent Claim
32 words
The improvement claimed in claim 4, wherein said runway symbol and said radar altitude value are also removed from said display when the speed of said aircraft is below a predetermined value.
Claim 7
Dependent Claim
31 words
The improvement claimed in claim 2, wherein said runway symbol and said radar altitude value are removed from said display when said aircraft is on the ground and at takeoff thrust.
Claim 8
Dependent Claim
35 words
The improvement claimed in claim 6, wherein said runway symbol and said radar altitude value are also removed from said display when said aircraft is on the ground and at a speed below 80 knots.
Claim 9
Dependent Claim
32 words
The improvement claimed in claim 2, wherein said flight path vector symbol is removed from said display when said aircraft is airborne and said radar altitude value is less than 200 feet.
Claim 10
Dependent Claim
39 words
The improvement claimed in claim 8, wherein said flight path vector symbol is removed from said display when said rising runway symbol is being displayed, said aircraft is airborne and said radar altitude value is less than 200 feet.
References Cited (Backward Citations)
US3515802A
Cited
US3517122A
Cited
US3668622A
Cited
US4070662A
Cited
US4057782A
Cited
US4147056A
Cited
US4210930A
Cited
US4368517A
Cited
US4247843A
Cited
US4348184A
Cited
US4490797A
Cited
US4628305A
Cited
US4561659A
Cited
US4554538A
Cited
US4559533A
Cited
US4635050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-11 | 1994-09-10 | 1995-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-11 | 1998-09-10 | 1999-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-11 | 2002-09-10 | 2003-03-12 | $7700.00 | Window Closed / Lapsed |