CS 25.1167 Accessory gearboxes

For aeroplanes equipped with an accessory gearbox that is not certificated as part of an engine –

(a)The engine with gearbox and connecting transmissions and shafts attached must be subjected to the test specified in CS-E 160 and CS-E 740, as applicable.

(b)The accessory gearbox must meet the requirements of CS-E 80 and CS-E 590, as applicable; and

(c)Possible misalignments and torsional loadings of the gearbox, transmission, and shaft system, expected to result under normal operating conditions must be evaluated.