Overview and limitations
De-icing can be seen from two viewpoints. What happens to any aircraft, as preparation for takeoff, and an airport oriented view. The airport oriented view includes things like de-icing stands, lines available for de-icing, taxi time from stands to de-icing and from de-icing to runway, and any queues. The airport oriented view is not included here.
This work package tries to describe use cases and de-ice relevant data related to one aircraft as preparation for takeoff. The aircraft is associated with a flight leg.
De-icing can be done on stand, but de-icing on dedicated de-icing areas seems to be more common as it is much easier to handle the environmental impact of the chemicals used.
Actions
- Verify use case coverage with other Airports Ole Nymoen 15.05.2023
- Rewrite the use cases to follow the ACRIS Use Case Template and add as a subpage Ole Nymoen 15.05.2023
- Terminology: Provide a report on how many terms identified need to be defined and how many of these are existing in the ACRIS model. Provide update on a Friday meeting Ole Nymoen 15.05.2023
- Please review use cases for de-icing
- LHR to review by May 19th
- ACTION: If we have enough time, workshop needed to review and accept comments
Use cases
Airport conditions are evaluated and de-icing is set as default for all departing flights. This means that all aircraft are likely to require de-icing, but the pilot has the final say and can reject de-icing. The pilot requests de-icing for a specific departing flight leg. De-icing must be planned for this specific flight. The CDM process estimates that the aircraft will be ready for de-icing at ERZT. The estimate (ERZT) is added to the relevant flight leg record and made available to all actors. De-icing commences at a specific lane at the de-icing station. This is reported by the de-icing operator. The information is added to the relevant flight leg record. De-icing is finished and the de-icing operator reports finish time, holdover time and fluids used. The information is added to the relevant flight leg record.Code and title: Description: Data consequences: DeIce-UC001: Set de-icing as default for departing flights DeIce-UC002: The pilot request de-icing DeIce-UC003: CDM ready for de-icing estimate DeIce-UC004: De-icing lane reported DeIce-UC005: De-icing is finished and data reported
De-ice relevant data
NB! The data set below does not include identification of the aircraft/flight leg/departure that the de-ice data is for. This will be different if the context is AODB data or a service to set de-ice data.
| ADD Term | Description / Comments |
|---|---|
| DeIceIsRequested | A boolean value indicating that de-icing, or anti-icing, is requested for the relevant aircraft. |
| DeIceProcessStatus | Indicates the status of the de-icing process. |
| DeIcePlatform | The platform where the de-icing occurred. The names are airport specific. De-icing is typically done either on stand or on a dedicated de-icing platform. |
| DeIceParkingPosition | Indicates the AircraftParkingPosition where de-icing was done. See also DeIcePlatform. |
| DeIceConditionCode | The code for the (weather) condition that led to de-icing being requested, and possibly performed. The codes listed under "Legal values" should always be supported. Additional codes can be defined if necessary. Codes defined here are always two digits. |
| DeIceAirTemperature | The air (ambient) temperature where the de-icing process occurs. |
Estimated Ready for De-icing Time. The estimated time when the aircraft is expected to be ready for de-icing operations. Always UTC time. | |
| ARZT | Actual Ready for De-icing Time. The time when the aircraft is ready to be de-iced. Always UTC time. |
| ECZT | Estimated Commencement of De-icing Time. The estimated time when de-icing operations on an aircraft are expected to start. Always UTC time. |
| ACZT | Actual Commencement of De-icing Time. The time when de-icing operations on an aircraft starts. Always UTC time. |
| EEZT | Estimated End of De-icing Time. The estimated time when de-icing operations on an aircraft are expected to end. Always UTC time. |
| AEZT | Actual End of De-icing Time. The time when de-icing operations on an aircraft end. Always UTC time. |
| EDIT | |
| ADIT | |
| MechanicalDeIceIsUsed | A boolean value indicating that mechanical de-icing in some form is used on the relevant aircraft. |
| AntiIceStartHoldoverTime | The start of the anti-ice holdover time. This will typically be when the first truck started to apply anti-ice fluid. Always UTC. |
| HandlerCode | Identifies a Handler. |
| HandlerName | Name of a Handler. |
| AodbDeIceFluidUsage 0..* | |
| DeIceFluidType | Indicates which de-ice fluid type, including water, that has been used on the relevant aircraft. Each fluid type is specified separately, typically with the volume used. |
| DeIceFluidVolume | Indicates the volume used of the relevant DeIceFluidType. |
