Unit 21: Maintenance

LO6: Understand how maintenance issues can inform designFailsafe design and redundancy

Learner activity sheet

Activity 1Engineered systems often incorporate features into their design in order to make them failsafe.

Additional features might also be included in order to provide redundancy.

Explain what is meant by the terms:

1. Failsafe

2. Redundancy

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Activity 2Look at the photographs below of engineered systems: aircraft, car braking system, rollercoaster and a

lift (elevator).

For each example, give examples of failsafe design features, and features that provide redundancy.

Some features might provide both failsafe and redundancy!

Aircraft Car braking system

Rollercoaster Lift (elevator)

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