DATA ITEM DESCRIPTION		
1.  TITLE	2.  IDENTIFICATION NUMBER	
Human Engineering Design Approach Document – Operator	FAA-HF-002	
3.  DESCRIPTION / PURPOSE	
The Human Engineering Design Approach Document – Operator (HEDAD-O) provides a source of data to evaluate the extent to which equipment having an interface with operators meets human performance requirements and human engineering criteria. 	
4. APPROVAL DATE (YYMMDD)	5. OFFICE OF PRIMARY RESPONSIBILITY (OPR)			
081599	DOT/FAA/AAR-100			
6.  APPLICATION / INTERRELATIONSHIP	
This Data Item Description (DID) contains the format and content preparation instructions for the HEDAD-O related to the work tasks delineated in 5.1 and 5.2 of MIL-HDBK-46855.	
7.  PREPARATION INSTRUCTIONS	
7.1 Reference documents.  The applicable issues of the documents cited herein (including their approval dates and dates of any applicable amendments, notices, and revisions) shall be as specified in the contract.	
	
7.2 Format.  The HEDAD-O format shall be contractor selected.  Unless effective presentation would be degraded, the initially used format arrangement shall be used for all subsequent submissions.	
	
7.3 General.   The HEDAD-O shall describe the layout, detail design, and arrangement of workstation equipment having an operator interface; it shall also describe operator tasks (see below) associated with the equipment.  The HEDAD-O shall describe the extent to which human performance requirements, the Human Factors Design Guide (HFDG) (DOT/FAA/CT-96/1), and other applicable human engineering documents specified in the contract have been incorporated into the layout, design, and arrangement of equipment having an operator interface.  Findings from analysis of operator tasks shall be presented as part of the rationale supporting the layout, design, and integration of workstation equipment.	
	
7.4 Content.  The HEDAD-O shall contain the following workstation and operator-related information:	
	
7.4.1 Equipment list.  A list of each item of equipment having an operator interface and a brief statement of the purpose of each item of equipment.  Separate lists shall be provided for each operator’s station.	
	
7.4.2 Specification and drawing list. A list of specifications and drawings approved by human engineering at the time of HEDAD-O preparation.  When contractually required to prepare and submit the HEDAD-O early in the development process, the list shall also address documents where human engineering approval is planned.	
	
7.4.3 Workstation description.  Description(s) of the workstation(s), emphasizing human engineering design features.  The following aspects of each workstation shall be described:	
	
7.4.3.1 Layout and arrangement. One sketch, drawing, or photograph of each workstation.  These sketches, drawings, or photographs shall contain operator and equipment related reference points (e.g., operator eye position, seat reference point) and scale.  One sketch, drawing, or photograph of each item of workstation equipment shall also be provided; the point of reference shall be normal to the item of equipment and scale shall be indicated.	
	
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Block 7 PREPARATION  INSTRUCTIONS (Continued)	
	
7.4.3.2 Controls and displays. The layout and detail design of each control/display panel (or control/display areas independent of panels) shall be described (e.g., brightness, resolution, contrast, color or other coding, control/display ratio, control force, and range characteristics).  Display symbology, display formats, and control/display operation logic shall be described with regard to intended use by the operator(s).	
	
7.4.3.3 Operator Vision.  Operator vision to workstation items of equipment shall be described using the operator’s normal eye position(s) as the point of reference.  When applicable, operator external vision shall also be described using the operator’s normal eye position(s) as the point of reference; extent of external vision shall be related to system mission requirements.	
	
7.4.3.4 Environmental factors.  Noise, vibration, radiation, temperature, ambient illumination, climatic effects, and other relevant environmental parameters.	
	
7.4.3.5 Workstation lighting. Workstation lighting characteristics and lighting control systems.	
	
7.4.3.6 Workstation signals.  Workstation signals including warning, caution, and advisory signals shall be described with regard to signal characteristics, signal meaning, signal consequences, operator procedures, cause of signal activation, and operator control over signal characteristics.	
	
7.4.3.7 Operator posture control.  Operator posture control including seating, restraint systems, and other postural control techniques.	
	
7.4.3.8 Communication systems. Communication systems and communication systems control.	
	
7.4.3.9 Special design. Special design, layout, or arrangement features if required by mission or system environment.	
	
7.4.3.10 Multiple operator stations. Multiple operator station design shall be described where applicable.  Rationale for number of operators, arrangement of operators, and allocation of functions to the operators shall also be described.	
	
7.4.4 Workstation geometry. Workstation geometry shall be described using the seat reference point or operator’s eye position(s) as a reference point.  The position of each control, display, panel, etc., shall be described in terms of three-dimensional space (X, Y, Z coordinates); operator eye position shall be described in terms of system design coordinates or as zero (X), zero (Y), and zero (Z).  The center of each panel, display, control, etc., shall be used as the equipment point of reference.  True angle to vision to each item of equipment shall also be shown.	
	
7.4.5 Human engineering design rationale.  Rationale for human engineering design, layout, and arrangement of each item of workstation equipment having an operator interface shall be described.  The specific considerations of system function; equipment operation; operator selection, training, and skill requirements; operator task performance requirements; and limitations imposed on designs by the procuring activity or state-or-the-art shall be described.  The basis for reaching specific design, layout, and arrangement decisions shall be presented (e.g., HFDG criteria, other human engineering requirements specified in the contract, system engineering analyses, systems analyses, human engineering studies, trade-off analyses, mock-up results, simulation results, and human engineering results).	

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Block 7 PREPARATION  INSTRUCTIONS (Continued)	

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7.4.6 Analysis of operator tasks.  Results from analysis of operator tasks (see 5.1 of MIL-HDBK-46855) shall be presented as part of the rationale for workstation design, integration, and layout.  The following shall be described: methodology used to generate task analysis results (e.g., paper and pencil, computer-based simulation, dynamic simulation); system function(s), or other exogenous information used to “drive” the task analysis; human performance data (i.e., time and error) against which task analysis results are compared; and operator assumptions (e.g., level of skill, training).  Critical tasks shall be clearly identified.  If the required data is available through other reporting media, such as a task inventory report or task performance analysis report, they shall not be duplicated, but shall be referenced or appended to the HEDAD-O along with appropriate supplementary information fulfilling the intent of this provision.	
	
7.4.7 Deviations. Narrative which provides rationale for any need to deviate from, or take exception to, the HFDG or other human factors engineering best practices.	
	
7.4.8 Alternatives to baseline design.  Sketch, drawing, or photograph of each item of equipment being considered as alternatives or changes to the selected (baseline) workstation design.	
	
7.4.9 Design changes.  Design, arrangement, or layout changes made since the last HEDAD-O preparation.	

	

	

	

	

	

	

	

	

	

	

	
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