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AFI91-206(I) 8 JULY 2004
1.4.4. In a mishap involving classified material, military authorities must identify an appropriate
access level so the NTSB and FAA may assign personnel with the appropriate clearances. Not all
NTSB and FAA personnel hold security clearances.
1.4.4.1. Official notification from the NTSB and the FAA to military authorities of the clearances
agency personnel hold and the presentation of agency credentials will constitute evidence of clear-
ance.
1.4.5. In a NTSB investigation not all participants may have security clearances. If classified material
is involved, the military authority and the NTSB will determine if such material is central or incidental
to the mishap, and take appropriate actions to limit access to the material to those personnel with the
appropriate clearance and need to know.