ENGEN180-test2

Environmental Factors Natural (9)

- High Temp

- Low Temp

- Temp Shock

- Fungus

- Humidity

- Rain

- Salt fog

- Sand

- Solar Radiation

Environmental Factors Induced (8)

- Water Ingress

- Acceleration / Drop

- Acoustic Noise

- Low pressure

- Shock Mechanical

- Vibration

- Electromagnetic Interference

- Chemical

Low Temp Contribution to Failure (7)

- Material brittle / Stiff

- Phase change

- Condensation

- Chemical Reactions slow down

- Shrinkage, Warping, Contraction

- Fluid viscosity changes

- Human comfort

High Temp Contribution to Failure (9)

- Materials can soften, Plastics - Adhesives

- Lower viscosity

- Phase changes

- Evaporation

- Chemical reactions speed up

- Expansion, warping

- Lower heat dissipation

- Human comfort

- Lower air density

How Radiation causes failure (1)

- Material properties can change when exposed to UV light radiation

Method to decrease Radiation failure (1)

- Inhibitors and reflective designs can reduce impact

How Temp shock contributes to failure, Physical (5), Chemical (2)

Physical

- Binding/slacking of moving parts

- Shattering of glass

- Cracking of surface coatings

- Leaking of sealed compartments

- Failure of insulation protection

Chemical

- Separation of constituents

- Failure of chemical agent protection

The main way Salt /or Fog contributes to failure (1) and ways to overcome (2)

- Corrosion

- Crevice free design

- Corrosion resistant materials

How Vibration contributes to failure, Machine (1), Humans (3)

Machine

- Causing components to come loose

Humans

- Vascular disorders

- Neurological disorders

- Carpal tunnel syndrome

Definition of Availability

The probability that a repairable system or system element is operational at a given point in time, under set environmental conditions

Two things Availability depends on

- Reliability

- Maintainability

Two Categories of Maintainability

- Serviceability (ease of conducting scheduled services)

- Repairability (Ease of restoring service after failure)

Assumed in Higher Heating Value (2)

- Water in substance is in vapor form

- Complete Combustion

Assumed in Lower Heating Value (2)

- Water in substance in liquid form

- Incomplete combustion

ATSB Safety issues (2)

- Organizational Influences

- Risk Controls

ATSB Safety Indicators (3)

- Local Conditions

- Individual Actions

- Occurrence events

SMART criteria (5)

- Specific

- Measurable

- Attainable

- Relevant

- Time-based

Specific Definition

Goal is direct, detailed and meaningful

Measurable Definition

Goal is quantifiable to track progress and success

Attainable Definition

Goal is realistic and you have the tools and or the resources to achieve it

Relevant Definition

Goal a lines with company mission

Time-Based Definition

Goal has a deadline

Way to increase the Availability by decreasing downtime (7)

- No Specialized tools

- Use Common parts

- Keep spares

- Documentation and SOP

- Maintenance items easily accessible

- A standardized or modular design

- On board diagnostics

- Can also be increased through reliability

Types of Requirements

- Functional

- Performance

- Usability

- Interface

- Operational

- Physical constraints

- Design constraints

- Logistical

Design Constraints

Defines the limits to the options that are available to a designer of a solution by imposing immovable boundaries and limits

Physical Constraints:

Define constraints on volume, weight and dimension to the elements within a system