Doc owner: Manufacturing Engineering
Work Environment Suitability Policy
Purpose
This policy ensures that the work environment — facilities, equipment, and conditions — is suitable for:
- Product conformity — Environmental conditions (temperature, humidity, cleanliness, ESD) meet the requirements that affect product quality.
- Personnel safety — The environment is safe for those working in it. Health and safety obligations may be covered by separate arrangements; this policy covers the quality management scope.
- Controlled assembly and test — Only approved materials, tools, and documentation are used; process flow and layout support the defined sequence and prevent mix-up, damage, or contamination.
- Process documentation — Every production step is covered by a work instruction that is consistent with the Manufacturing Data Pack (MDP) and Production Control Plan.
Requirements for the environment are derived from the product and process definition. Production moves toward controlled assembly areas, ESD controls where required, and a defined production line or cell layout.
Scope
This policy applies to:
- Manufacturing and assembly areas (including subassembly and final assembly).
- Test and inspection areas.
- Environmental and ESD controls.
- Production line and cell layout and flow.
- The link between process documentation (work instructions) and the environment in which work is done.
Policy Requirements
1. Controlled Assembly Areas
Assembly and test areas shall be defined and controlled so that:
| Requirement | Description |
|---|---|
| Approved materials only | Only materials that are released and correct for the baseline are present and used. Kitting and issue are per the MDP and build record. |
| Approved tools and equipment | Only tooling and test equipment that are approved and (where applicable) calibrated are used. |
| Current documentation | Only released work instructions, drawings, and MDP documents are used. Obsolete documents are removed from the work area. |
| Environmental conditions | Temperature, humidity, and cleanliness meet specified requirements where they affect product (e.g. adhesives, coatings, electronics). |
| Access and activities | Access and activities are consistent with process and quality requirements. Unauthorised or ad-hoc changes are not permitted. |
Requirements for each controlled area are derived from the MDP, Production Control Plan, and DFx (Design for Manufacture). Where the MDP specifies environmental limits (e.g. temperature range, humidity, cleanliness class), those limits are implemented and monitored. Records of environmental monitoring are maintained where required.
2. ESD Controls
Where product or components are ESD-sensitive (e.g. electronics assembly, PCBs, sensitive devices), ESD controls shall be implemented. The need is identified in the MDP, DFx, or component specification.
| Element | Requirement |
|---|---|
| Workstations | Grounded workstations and ESD-safe work surfaces. Tools and fixtures are grounded where required. |
| Flooring | ESD flooring or floor mats where specified, with appropriate resistance and grounding. |
| Personnel | Wrist straps or other personnel grounding as required. Personnel are trained and comply with ESD discipline; no ungrounded contact with sensitive parts. |
| Humidity | Humidity controlled where specified to reduce ESD risk (e.g. minimum 30% RH in assembly areas). Monitored and recorded where required. |
| Handling and packaging | ESD-safe handling (e.g. trays, bags, boxes) and packaging. Sensitive items are not placed on non-ESD surfaces. |
ESD equipment (wrist straps, mats, flooring) is verified and maintained. Failure of ESD control (e.g. wrist strap fault) is handled so that product is not compromised — re-check or quarantine as appropriate.
3. Production Line Layout
Production layout shall support the defined process flow and Production Control Plan:
- Logical flow — Sequence from receipt and kitting through assembly, inspection, test, and release. No backtracking or cross-flow that risks mix-up or damage.
- Clear identification — Workstations, inspection points, and test areas are clearly identified by signage or area designation. Operators and inspectors know where each step is performed.
- Minimise risk — Layout minimises cross-contamination, mix-up, and damage. Segregation of sensitive operations (e.g. ESD, clean) is maintained.
- Change control — Layout changes that affect process or product are managed via the Change Management process. Impact on process flow, work instructions, and control plan is assessed; documents are updated and approved before implementation.
4. Process Documentation
Every production step shall be covered by a work instruction or equivalent document that specifies:
| Element | Description |
|---|---|
| What to do | Sequence, torque values, settings, orientation, and any critical parameters. |
| What to verify or inspect | In-process checks and acceptance criteria. |
| What to record | Build record and any other quality records required. |
| Environment and equipment | Reference to ESD, environment, or special equipment where applicable. |
| Safety | Safety instructions relevant to the operation. |
Work instructions are controlled documents. They are consistent with the MDP and Production Control Plan. Revisions are issued when the process or product changes. Obsolete versions are withdrawn from the work area.
Governance
| Role | Responsibility |
|---|---|
| Manufacturing Engineering | Definition of controlled areas, layout, and work instructions; ESD and environment specification; change impact assessment for layout and process. |
| Quality | Verification that environment and process meet requirements; audit of controlled areas and ESD controls; input to change review. |
| Production | Day-to-day compliance with work instructions and ESD requirements; reporting of environment or equipment issues. |
| Facilities / Maintenance | Environmental systems (HVAC, humidity); ESD flooring and grounding; maintenance of equipment where applicable. |
The Head of Production is accountable for this policy.
Review cadence: This policy shall be reviewed annually, or when a significant change to manufacturing environment or product type occurs.
Exceptions: Exceptions to this policy must be approved by Manufacturing Engineering and Quality, and documented with the associated risk and any compensatory controls.
Records
The following records are maintained:
- Layout and area definitions (controlled documents).
- Environmental monitoring records (where required by MDP or control plan).
- ESD verification and maintenance records.
- Work instructions (controlled documents).
- Change records where layout or process changes are made.
Retention periods follow the control of records procedure.
Definitions
Controlled assembly area — A defined area in which assembly or test is performed under controlled conditions (materials, tools, environment, documentation) so that only approved and correct items are used and product conformity is maintained.
ESD (Electrostatic Discharge) — The transfer of static charge that can damage or degrade ESD-sensitive components (e.g. electronics). ESD controls include grounding, conductive surfaces, and humidity control to prevent such discharge.
MDP (Manufacturing Data Pack) — The approved, complete product and process definition issued for production execution.
Work instruction — A document that defines how a specific operation or step is performed (e.g. sequence, torque, inspection, recording). Work instructions are controlled and aligned with the MDP and Production Control Plan.
Related Documents
- Change Management process
- Design for Manufacture, Assembly, Cost and Scale (DFx) process
- Manufacturing Data Pack (MDP) process
- Tooling and Test Equipment Management process
- Preservation, Handling and Storage process
- Production Control Plan
- Product Build Record (WI-001)
- Manufacturing Process Flow (WI-003)