What document can be used temporarily if a Flight Engineer loses their FEX certificate?

The correct answer pertains to the use of a facsimile copy from Oklahoma City, which can serve as a temporary measure for a Flight Engineer who has lost their FEX certificate. In the event of loss, the FAA allows for an immediate, albeit temporary, documentation solution through this method. A facsimile copy acts as a valid representation of the lost certificate and can help the engineer continue operations until the official replacement is obtained.

This option is pertinent because it reflects a practical approach that the FAA has set in place for situations where an original document has been misplaced. Aviation operations often require valid documentation on hand, and this temporary solution helps ensure that there is minimal disruption to the Flight Engineer's responsibilities.

While other document types like notarized copies or electronic versions might be used in other contexts, they do not fulfill the specific legal requirements demanded by aviation authorities for operational purposes. A temporary permit issued by the FAA is also not applicable in this scenario, as the FAA does not issue temporary permits specifically for lost FEX certificates. Hence, the use of a facsimile copy from Oklahoma City provides a valid, immediate alternative while awaiting the resolution of the situation.