# US 12,183,211 B2 · Method and system for initiating and managing required time of arrival constraints for an aircraft for all phases of flight

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- Number: US 12,183,211 B2
- Document ID: US12183211B2
- Status: Granted
- Kind: B2
- Application number: 17/398,733
- Filed: 2021-08-10
- Published: 2022-02-17
- Granted: 2024-12-31
- Earliest claimed: 2020-08-14
- Assignees: Honeywell International Inc.
- Applicants: Honeywell International Inc.
- Inventors: Steven Curtis Crouch; Santosh Mathan; Matthew Joseph; Bradley Bootz; Richard Snyder
- Web page: https://patentgrep.com/patent/US12183211B2

## CPC

- G08G 5/21: located onboard the aircraft
- G08G 5/34: for flight plan modification
- G01C 21/20: Instruments for performing navigational calculations (G01C21/24, G01C21/26 take precedence)
- G08G 5/26: Transmission of traffic-related information between aircraft and ground stations
- G08G 5/53: for cruising
- G08G 5/76: for monitoring atmospheric conditions
- G08G 5/55: for a single aircraft
- G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93})
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)

## Abstract

Methods and apparatus are provided for performing determinations and actions as to a required time of arrival (RTA) for an aircraft during flight. In exemplary embodiments, data is received as to the RTA for the aircraft during flight. Also in exemplary embodiments, determinations are made, via a processor, as to one or more RTA limits for the aircraft based on the RTA. Also in exemplary embodiments, the RTA limits comprise one or both of the following: one or more limits for aircraft speed based on the RTA; and one or more limits for aircraft arrival time based on the RTA.

## Claims

### Claim 1

A method comprising:
receiving data as to a required time of arrival (RTA) for an aircraft during flight, including during climbing, cruise, and descent of the aircraft;
determining, via a processor, RTA limits for the aircraft based on the RTA, wherein the RTA limits comprise both of the following:
limits for aircraft speed based on the RTA, wherein the limits for the aircraft speed comprise both:
a minimum limit comprising an envelope speed for the aircraft; and
a maximum limit comprising a maximum allowable speed for the aircraft;
a plurality of limits for aircraft arrival time based on the RTA, including an earliest possible time of arrival, a latest possible time of arrival, and a predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft;
displaying, via a display device in accordance with instructions provided by the processor, a request for an RTA constraint for the aircraft;
determining, via the processor, a recommended speed for the aircraft for compliance with the RTA constraint;
determining, via the processor, whether the aircraft is early, on time, or late with respect to the RTA constraint, based on the recommended speed in addition to the envelope speed for the aircraft, the maximum allowable speed for the aircraft, and the plurality of limits for aircraft arrival time based on the RTA, including the earliest possible time of arrival, the latest possible time of arrival, and the predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft;
displaying, via the display device in accordance with instructions provided by the processor, the recommended speed for the aircraft for compliance with the RTA constraint; and
displaying, via the display device in accordance with instructions provided by the processor:
a direct color-coded status as to whether the aircraft is early, on time, or late with respect to the RTA constraint, with respect to each particular waypoint of a plurality of waypoints of a flight path of the aircraft to reach its destination;
the RTA;
the limits for aircraft speed based on the RTA, including both the minimum limit and the maximum limit for the aircraft speed based on the RTA; and
the plurality of limits for aircraft arrival time based on the RTA, including the earliest possible time of arrival, the latest possible time of arrival, and the predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of determining the RTA limits comprises:
determining, via the processor, both the limits for aircraft speed and the plurality of limits for aircraft arrival time based on the RTA.

### Claim 3 (depends on 1)

The method of claim 1, wherein the method is performed during all phases of flight for the aircraft, including takeoff, cruise, and landing.

### Claim 4 (depends on 1)

The method of claim 1, wherein the displaying of the direct color-coded status comprises displaying the direct color-coded status:
with a first color when the aircraft is on time with respect to the RTA constraint; and
with a second color, different from the first color, when the aircraft is early or late with respect to the RTA constraint.

### Claim 5 (depends on 4)

The method of claim 4, wherein the displaying of the direct color-coded status comprises displaying the direct color-coded status:
with a green color when the aircraft is on time with respect to the RTA constraint;
with an amber color when the aircraft is early or late with respect to the RTA constraint.

### Claim 6 (depends on 4)

The method of claim 4, wherein the displaying of the direct color-coded status comprises displaying the direct color-coded status:
with the first color when the aircraft is on time with respect to the RTA constraint;
with the second color when the aircraft is early with respect to the RTA constraint, accompanied by an amount of time in which the aircraft is early with respect to the RTA constraint; and
with the second color when the aircraft is late with respect to the RTA constraint, accompanied by an amount of time in which the aircraft is late with respect to the RTA constraint.

### Claim 7 (depends on 1)

The method of claim 1, wherein the one or more minimum limits for the aircraft speed based on the RTA are further limited by: (i) a minimum envelope speed (ENV); (ii) maximum endurance speed (END); and (iii) an RTA minimum speed (MIN) for the aircraft.

### Claim 8 (depends on 7)

The method of claim 7, wherein the one or more maximum limits for the aircraft speed based on the RTA are further limited by: (i) a maximum envelope speed (ENV) and (ii) an RTA maximum speed (Max) for the aircraft.

### Claim 9 (depends on 1)

The method of claim 1, further comprising:
determining, via the processor, whether the RTA is feasible for the aircraft to attain, in view of the recommended speed in addition to the envelope speed for the aircraft, the maximum allowable speed for the aircraft, and the plurality of limits for aircraft arrival time based on the RTA, including the earliest possible time of arrival, the latest possible time of arrival, and the predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft;
displaying, via the display device in accordance with instructions provided by the processor, whether the RTA is feasible.

### Claim 10 (depends on 1)

The method of claim 1, further comprising:
determining, via the processor, that the RTA is not feasible for the aircraft to attain, when the aircraft is late and the speed needed to arrive within the predetermined time accuracy tolerance is greater than the maximum allowable speed for the aircraft.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
determining, via the processor, that the RTA is not feasible for the aircraft to attain, when the aircraft is early and the speed needed to arrive within the predetermined time accuracy tolerance is less than the envelope speed for the aircraft.

### Claim 12 (depends on 11)

The method of claim 11, wherein the predetermined time accuracy tolerance is equal to a default value that is subject to calibration by a user of the aircraft.

### Claim 13 (depends on 12)

The method of claim 12, wherein the default value is equal to approximately ten seconds with a ninety five percent confidence ability.

### Claim 14 (depends on 1)

The method of claim 1, further comprising:
displaying, via the display device in accordance with instructions provided by the processor, a default RTA value in a first RTA color;
determining, via the processor, whether a user has manually edited the default value, generating a manually edited default value; and
displaying, via the display device in accordance with instructions provided by the processor, the manually edited default value in a second RTA color, different from the first RTA color, when the user has manually edited the default value.

### Claim 15 (depends on 14)

The method of claim 14, wherein:
the first RTA color is green; and
the second RTA color is white.

### Claim 16

A program product comprising:
a non-transitory computer readable storage media configured to store a program that is configured to at least facilitate:
receiving data as to a required time of arrival (RTA) for an aircraft during flight, including during climbing, cruise, and descent of the aircraft;
determining RTA limits for the aircraft based on the RTA, wherein the RTA limits comprise both of the following:
limits for aircraft speed based on the RTA, wherein the limits for the aircraft speed comprise both:
a minimum limit comprising an envelope speed for the aircraft; and
a maximum limit comprising a maximum allowable speed for the aircraft; and
a plurality of limits for aircraft arrival time based on the RTA, including an earliest possible time of arrival, a latest possible time of arrival, and a predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft;
displaying, via a display device in accordance with instructions provided by the program, a request for an RTA constraint for the aircraft;
determining a recommended speed for the aircraft for compliance with the RTA constraint;
determining whether the aircraft is early, on time, or late with respect to the RTA constraint, based on the recommended speed in addition to the envelope speed for the aircraft, the maximum allowable speed for the aircraft, and the plurality of limits for aircraft arrival time based on the RTA, including the earliest possible time of arrival, the latest possible time of arrival, and the predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft;
displaying, via the display device in accordance with instructions provided by the program, recommended speed for the aircraft for compliance with the RTA constraint; and
displaying, via the display device in accordance with instructions provided by the processor:
a direct color-coded status as to whether the aircraft is early, on time, or late with respect to the RTA constraint, with respect to each particular waypoint of a plurality of waypoints of a flight path of the aircraft to reach its destination;
the RTA;
the limits for aircraft speed based on the RTA; and
the plurality of limits for aircraft arrival time based on the RTA, including the earliest possible time of arrival, the latest possible time of arrival, and the predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft; and
a processor coupled to the non-transitory computer readable storage media a configured to execute the program.

### Claim 17

An aircraft comprising:
a body;
a propulsion system configured to move the body; and
a control system configured to control the propulsion system, the control system comprising:
a non-transitory computer readable storage media configured to store a program that is configured to at least facilitate:
receiving data as to a required time of arrival (RTA) for the aircraft during flight, including during climbing, cruise, and descent of the aircraft;
determining RTA limits for the aircraft based on the RTA, wherein the RTA limits comprise both of the following:
limits for aircraft speed based on the RTA; and
a plurality of limits for aircraft arrival time based on the RTA, including an earliest possible time of arrival, a latest possible time of arrival, and a predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft;
displaying, via a display device in accordance with instructions provided by the program, a request for an RTA constraint for the aircraft;
determining a recommended speed for the aircraft for compliance with the RTA constraint;
determining, via the processor, whether the aircraft is early, on time, or late with respect to the RTA constraint, based on the recommended speed in addition to the envelope speed for the aircraft, the maximum allowable speed for the aircraft, and the plurality of limits for aircraft arrival time based on the RTA, including the earliest possible time of arrival, the latest possible time of arrival, and the predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft;
displaying, via the display device in accordance with instructions provided by the program, recommended speed for the aircraft for compliance with the RTA constraint; and
displaying, via the display device in accordance with instructions provided by the processor:
a direct color-coded status as to whether the aircraft is early, on time, or late with respect to the RTA constraint, with respect to each particular waypoint of a plurality of waypoints of a flight path of the aircraft to reach its destination;
the RTA;
the limits for aircraft speed based on the RTA; and
the plurality of limits for aircraft arrival time based on the RTA, including the earliest possible time of arrival, the latest possible time of arrival, and the predetermined time accuracy tolerance for the aircraft arrival time during the climbing, cruise, and descent of the aircraft; and
a processor coupled to the non-transitory computer readable storage media a configured to execute the program.

### Claim 18 (depends on 17)

The aircraft of claim 17, wherein the displaying of the direct color-coded status comprises displaying the direct color-coded status:
with a first color when the aircraft is on time with respect to the RTA constraint; and
with a second color, different from the first color, when the aircraft is early or late with respect to the RTA constraint.

### Claim 19 (depends on 18)

The aircraft of claim 18, wherein the displaying of the direct color-coded status comprises displaying the direct color-coded status:
with a green color when the aircraft is on time with respect to the RTA constraint;
with an amber color when the aircraft is early or late with respect to the RTA constraint.

### Claim 20 (depends on 18)

The aircraft of claim 18, wherein the displaying of the direct color-coded status comprises displaying the direct color-coded status:
with the first color when the aircraft is on time with respect to the RTA constraint;
with the second color when the aircraft is early with respect to the RTA constraint, accompanied by an amount of time in which the aircraft is early with respect to the RTA constraint; and
with the second color when the aircraft is late with respect to the RTA constraint, accompanied by an amount of time in which the aircraft is late with respect to the RTA constraint.