H2: Human Performance and Limitations

Which one of the lists below contains only internal performance shaping factors that may adversely affect the engineer in the performance of maintenance tasks?

• Lack of proper training, poor workspace layout and high stress levels.

• High stress levels, lack of basic engineering skills and a marriage breakdown.

• Poor workspace layout, adverse environmental conditions and poorly designed maintenance stands.

Which one of the following lists correctly identifies the important human senses?

• Vision, audition, touch, smell, taste, vestibular, kinesthetic and psychic

• Vestibular, kinesthetic, audition, touch, taste, smell, vision and proprioceptive

• Intuition, kinesthetic, audition, touch, taste, smell, vision and proprioceptive

Concentration span for a repetitive maintenance task is

• 30 minutes

• 120 minutes

• 180 minutes

Working memory (short-term memory)

• does not preserve the physical details

• rapidly decays in the visual, auditory and kinesthetic stores

• is not pre-attentive (i.e. conscious attention is required)

Judgement is a combination of

• headwork and attitude

• experience and exposure

• decision making and responsibility

Effective decision making includes

• taking a vote as this is the most democratic.

• listening to and considering the viewpoints of the other technicians.

• relying on personal feelings as these are most often correct.

A LAE makes use of his sight to perform aircraft maintenance inspections. Peripheral vision accuracy is measured

• at an acute angle of 90 degrees from the line of vision.

• at ±10 degrees from the line of vision.

• only straight ahead in the line of vision.

During an inspection of structure, we cannot rely on peripheral vision. The arc of accurate vision in most people is

• 90 degrees from the eye

• 10 degrees from the centre of the eye

• only straight ahead from the eye

Internal and external performance shaping factors (PSF) can be considered as

• positive

• positive or negative

• negative

Performance Shaping Factor (PSF) is a major contributing factor in maintenance error. PSF consists of internal and external. Which of the following is external PSF?

• Improper tooling and poor working condition

• Illness and disturbance from family matters

• Pressure from management