Ergonomics aspects of the Japanese turbo-prop aero-plane YS-11 were discussed. General arrangement of interior spaces, noise protection for crew and passengers and air conditioning were appreciated. Other merits might be the systematic layout of auxiliary controls making efficient use of the overhead panel, though the panel was a little too large, and considerations as to grouping, form and colour of main controls. Arrangement of turn and bank indicators, which were set at the right of the chief pilot and at the left of the second pilot, should be improved. 72 signal lamps, 40% of which were located on the overhead panel, were not effectively grouped and adoption of a concentrated warning-lamp system with masterlamps in the middle of visual field, along with the reduction of the mumber of lamps, was also recommended.
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