4.9Propulsion System Monitoring
4.9.1The air operator's assessment of propulsion systems reliability for the ETOPS fleet should be made available to their Transport Canada PMI (with supporting data) on at least a monthly basis, to ensure that the approved maintenance program continues to maintain a level of reliability necessary for Extended Range Operations.
4.9.2The assessment will include, as a minimum, engine hours flown in the period, in flight shut-down rate for all causes and engine removal rate, both on a 12month moving average basis. Where the combined ETOPS fleet is part of a larger fleet of the same aircraft/engine combination, data from the air operator's total fleet will be acceptable. However, the reporting requirements of paragraph4.7 of this Chapter must still be observed for the ETOPS fleet.
4.9.3Any adverse sustained trend would require an immediate evaluation to be accomplished by the air operator in consultation with the Transport Canada PMI. The evaluation may result in corrective action or operational restrictions being applied.
Note: Where statistical assessment alone may not be applicable, e.g. when the fleet size is small, the air operator's performance will be reviewed on a case-by-case basis.
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