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2 Scope
The following document explains a suitable method of specifying and testing the adequacy of the Human Machine Interface (HMI). It applies to all displays used for presenting Air Traffic Services (ATS) surveillance data at aerodromes and is subject to approval under Air Navigation Order Article 205.
Part 2 Requirements
3 Safety Objective
To ensure the operation of surveillance data displays is unambiguous and does not compromise the safety of the Air Traffic Service (1714).
4 The Specification of the Display HMI
4.1 Operational Requirement The specific operational requirement (OR) for the equipment shall be defined (636).
4.2 Evaluation
4.2.1 A formal ergonomic evaluation shall be carried out to ensure that the safety of the ATS is not compromised (637).
4.3 HMI Definition
The following stages are recommended in the definition of an HMI. In each case, the impact on ATC should be assessed and justified with respect to the OR and the Safety Objective (638).
4.3.1 Recommendation: The activities that the system should perform should be defined (639).
4.3.2 Recommendation: The events that can occur that require a cognitive or perceptive response should be defined (640).
4.3.3 Recommendation: The tasks that the system should accomplish in order to respond to the events and activities should be defined (641).
4.3.4 Recommendation: The tasks should be ranked in order of priority according to the OR (642).
NOTE: As referred to in CAP 760, adequate attention must be made to Human Factors, in assessing HMI. The link below provides a list of useful ICAO documents, including Doc. 9758 Human Factor Guidelines for Air Traffic Management (ATM) Systems.
http://www.icao.int/anb/humanfactors/Documents.html
5 Functional and Performance Requirements
5.1 Confirmation of Activation
5.1.1 The input device shall give immediate confirmation of selection (643).
NOTE: This does not mean that the equipment shall carry out the function selected immediately.
5.2 Selection Time
5.2.1 The selection time shall correlate with the priority level (644).
NOTE: This is defined as the time between first confirmation of activation and function available.
5.2.2 Recommendation: The following are recommended: a) Less than 1 sec for high priority (645). b) Less than 5 sec for medium priority (646). c) Not defined for low priority (647). NOTE: Other times may be justified as appropriate to the specific OR.
5.3 Wait Indication
5.3.1 The system shall indicate its indeterminate state during the time between confirmation of activation and function available (648).
5.3.2 Recommendation: All input should be prohibited, except cancellation, during this wait period (649).
5.4 Traceability of Device Specification
Recommendation: The mechanical performance of all input devices should be specified to a recognised test standard (650).
6 Input Devices Technical Requirements
6.1 Safety Objective
The input devices shall not mislead or hinder the operator or be capable of unintended action (651).
6.2 General
The following requirements and recommendations are made in respect to specific input devices. These devices shall be appropriate to the task, have consistent performance characteristics and facilitate ease of use (652).
6.3 Recommendation: All input devices on the workstation should have appropriate characteristics. Specific regard should be made to the following: a) Size of input device (653). b) Separation between input devices (654). c) Feedback method – aural, tactile or visual, as appropriate (655). d) Displacement, e.g. push distance (656). e) Labelling (657). f) Actuating force (658).
g) Suitability to task (659).
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CAP 670 Air Traffic Services Safety Requirements 2(93)
