Flight crew licences are one of the items inspected under the European Civil Aviation Conference's Safety Assessment of Foreign Aircraft Programme. The 2000 annual report for the programme (the latest annual report available on the ECAC web site -
http://www.ecac-ceac.org/uk/document...Report2000.pdf) shows that flight crew licences were inspected on 1106 occassions that year. On 49 occassions deficiencies were identified (which could have been anything from the licence not being carried, to US co-pilots not being type rated). Such deficiencies are taken very seriously and are likely result in the grounding of the aircraft until they are resolved.