DATA ITEM DESCRIPTION

^{1.  TITLE}

^{2.  IDENTIFICATION NUMBER}

Human Engineering Design Approach Document – Maintainer

FAA-HF-003

^{3.  DESCRIPTION / PURPOSE}

The Human Engineering Design Approach Document – Maintainer (HEDAD-M) provides a source of data to evaluate the extent to which equipment having an interface with maintainers 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-M resulting from 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-M format shall be contractor selected.  Unless effective presentation would be degraded, the initially used format arrangement shall be used for all subsequent submissions.  The HEDAD-M format shall present the information in two major parts:

a. Information pertaining to maintenance actions performed at the deployed site.

b. Information pertaining to maintenance actions performed at other maintenance levels.

7.3 General.   The HEDAD-M shall describe the characteristics, layout, and installation of all equipment having a maintainer interface; it also shall describe maintainer tasks associated with the equipment.  The HEDAD-M shall describe the extent to the requirements of 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 design, layout, and installation of equipment having a maintainer interface.  Results from analysis of maintainer tasks shall be presented as part of the rationale supporting the layout, design, and installation of the equipment.  The requirement for this information is predicated on the assumption that analytic and study information is developed sufficiently early to influence the formulation of other system data such as maintenance allocation charts, special repair parts, tool lists, and Logistic Support Analysis Record (LSAR) data.  If the required data is available through other reporting media, such as those noted above, a task inventory report or task performance analysis report shall not be duplicated, but shall be referenced or appended to the HEDAD-M along with appropriate supplementary information fulfilling the intent of this provision.

7.4 Content.  The HEDAD-M shall contain the following:

7.4.1 Equipment list.  A list of each item of equipment having a maintainer interface, and a brief statement of the purpose of each item of equipment and types of maintenance required on each item of equipment (e.g., troubleshoot, remove, inspect, test, repair).

7.4.2 Specification and drawing list. A list of specifications and drawings, approved by human engineering at the time of HEDAD-M preparation.  The list also shall address documents where human engineering approval is planned.

(Continued on Page 2)

AUG 99

Previous editions are obsolete

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Block 7 PREPARATION  INSTRUCTIONS (Continued)

7.4.3 System equipment description.  Description(s) of the system equipment, emphasizing human engineering design features.  The following aspects of each workstation shall be described:

7.4.3.1 Layout and arrangement. The location and layout of all system equipment requiring maintenance with emphasis on human engineering features which facilitate maintenance.  Equipment located in areas assessed through common doors, panels, openings, etc., shall be indicated.  The location of each item of equipment shall be noted in terms of three-dimensional space (i.e., X, Y, and Z coordinates); the reference point for each item of equipment shall be its center as viewed by the maintainer while gaining access to the equipment. 

7.4.3.2 Design of equipment. The design of each item of equipment with emphasis on human engineering features which facilitate maintenance such as handles, self-test capability, labeling, connector spacing, and keying.

7.4.3.3 Installation of equipment.  The installation of each item of equipment with emphasis on human engineering features which facilitate maintenance such as fasteners, clearances, relationship between accessibility and failure rate (or scheduled maintenance frequency) of each item of equipment, and visual access afforded.

7.4.4 Rationale. The specific considerations of equipment maintenance requirements (e.g., frequency, criticality, equipment failure rate), maintainer requirements (e.g., personnel selection, training, and skills), maintainer tasks requirements, environmental considerations, safety, and limitations imposed by the procuring activity or state-of-the-art.  The bases for reaching specific design, layout, and installation decisions shall be presented (e.g., HFDG criteria, other human engineering requirements specified in the contract, human engineering studies, trade-off analyses, mock-up results, and human engineering test results).

7.4.5 Special tools, support equipment, and aids.  A list of special tools, support equipment, and job aids/devices required for maintenance of each item of equipment.

7.4.6 Analysis of maintainer tasks.  Results from analysis of maintainer tasks (see 5.1 of MIL-HDBK-46855) shall be presented as part of the rationale supporting layout, design, and installation of items of equipment.  Analysis of maintainer tasks shall consist of the following: task number, task title, task frequency (for scheduled maintenance actions) or estimated task frequency (based on equipment mean-time-between-failures for unscheduled maintenance actions), data source used (e.g., drawing number, sketch number, development hardware, actual production equipment), detailed task sequence (see 5.1 of MIL-HDBK-46855), support equipment required, tools required, job aids required, estimated task time, estimated personnel requirements (e.g., number of personnel required, skills and knowledge required) and human engineering considerations which reflect specific human engineering requirements incorporated into the design (e.g., maintainer fatigue, potential hazards, safety or protective clothing/equipment required or recommended, access problems, maintainer communication requirements, special task sequence requirements, labeling).  As applicable, the following types of maintainer tasks shall be addressed by the analyses of maintainer tasks: remove/replace, troubleshoot (fault location), repair, adjust, inspect, service, and test.  Tasks requiring critical human performance shall be clearly identified.

7.4.7 Deviations. Narrative which provides rationale for any need to deviate from, or take exception to, the HFDG or other contractual human engineering requirements.

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Block 7 PREPARATION  INSTRUCTIONS (Continued)

7.4.8 Maintainer interface depictions.  A sketch, drawing, or photograph of each item of equipment having a maintainer interface.  Each item of equipment shall be depicted:

a. By itself from top, front, and side (three-view trimetric or exploded trimetric view) and

b. Installed as the maintainer would normally view it during maintenance.

7.4.9 Alternative installations or layouts.  A sketch, drawing, or photograph of each item of equipment being considered as an alternative to the selected, or baseline design.  A sketch, drawing, or photograph of alternative equipment installations or layouts that exist at the time of HEDAD-M preparation shall be provided.

7.4.10 Design changes.  Design, arrangement, or layout changes made since the last HEDAD-M preparation.

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