4 August 2016

When does the interval for the next aircraft maintenance check/task or the interval for the component check/overhaul after the lengthy maintenance/storage starts?

In a normal scenario :


  • The date of release should be considered to be the date of accomplishment
  • The new deadline should be calculated using the date of release

However there may be a lot of different considerations that change the normal scenario and make the statements above no longer valid. For example:

Case 1: When the maintenance task has been “extended” using a procedure approved by the competent authority and included in the AMP (refer to Appendix I to AMC M.A.302 point 4). In this case the new deadline is calculated using the old deadline (sometimes called “tolerance”).

Case 2: The maintenance task refers to a component maintenance task, for example the landing gear overhaul. In this case the start of the interval would be the date of the release to service after the overhaul of the landing gear or in some particular cases when specified in the maintenance data the interval may start from the date of installation.

Case 3: The task is part of a maintenance check, where the duration of the check is significant compared to the interval of the task. For example a check that lasts for 2 months and an inspection which has an interval of 3 months. In this case, it is reasonable to think that the performance of this task would need to be planned for the last days of the maintenance check. Otherwise the inspection also can be done on the first day, but in that case it is reasonable to expect that it will be released that very first day (then the deadline would be 3 months after the release). It also applies to the specific cases of mandatory tasks (ADs, CMRs, ALIs, SBs etc.) defining repetitive action with a calendar limit.

There are many other examples, the key is to use sound engineering judgment and the guidance provided in the ICAs to calculate the next deadline.

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