About those Xs

As stated above each engine, propeller and life-limited item installed on an O-M aircraft shall have an X permanently etched, engraved or stamped at the end of the model designation and serial number on the identification plate required by CAR 201.01. This means that the letter X is permanently etched, engraved or stamped at the end of the model designation and serial number with no space and no hyphen (i.e.: PA22-125X).

If engines, propellers and life-limited parts are replaced after the issue of the O-M Special Certificate of Airworthiness there a requirement for these new component dataplates to be marked with an X, too. The X is one of the conditions that has to be complied with in order to have an aircraft in this category. The owner will have no authority to sign the maintenance release on a component that does not carry an X. Remember, any modification to dataplates requires an authorization from the Minister pursuant to CAR 201.03(3) and 201.12(4).

If an X engine from an O-M aircraft is removed and sent to an approved overhaul shop and this engine is overhauled as per the manufacturer recommendations and specifications it still retains its X on the serial number. The owner cannot request the modification of the information on the engine identification plate to remove the X.
Pursuant to CAR 201.12(4), an authorization is required from the Minister to modify information on the engine data plate. The X cannot be removed without that authorization.

As mentioned earlier under CAR 201.03 you need to apply for permission to put the Xs on the dataplates, so contact your local TC office before you do this.


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