[Code of Federal Regulations]
[Title 49, Volume 8]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR1542.303]

[Page 322]
 
                        TITLE 49--TRANSPORTATION
 
   CHAPTER XII--TRANSPORTATION SECURITY ADMINISTRATION, DEPARTMENT OF 
                            HOMELAND SECURITY
 
PART 1542_AIRPORT SECURITY--Table of Contents
 
                     Subpart D_Contingency Measures
 
Sec. 1542.303  Security Directives and Information Circulars.

    (a) TSA may issue an Information Circular to notify airport 
operators of security concerns. When TSA determines that additional 
security measures are necessary to respond to a threat assessment or to 
a specific threat against civil aviation, TSA issues a Security 
Directive setting forth mandatory measures.
    (b) Each airport operator must comply with each Security Directive 
issued to the airport operator within the time prescribed in the 
Security Directive.
    (c) Each airport operator that receives a Security Directive must--
    (1) Within the time prescribed in the Security Directive, verbally 
acknowledge receipt of the Security Directive to TSA.
    (2) Within the time prescribed in the Security Directive, specify 
the method by which the measures in the Security Directive have been 
implemented (or will be implemented, if the Security Directive is not 
yet effective).
    (d) In the event that the airport operator is unable to implement 
the measures in the Security Directive, the airport operator must submit 
proposed alternative measures and the basis for submitting the 
alternative measures to TSA for approval. The airport operator must 
submit the proposed alternative measures within the time prescribed in 
the Security Directive. The airport operator must implement any 
alternative measures approved by TSA.
    (e) Each airport operator that receives a Security Directive may 
comment on the Security Directive by submitting data, views, or 
arguments in writing to TSA. TSA may amend the Security Directive based 
on comments received. Submission of a comment does not delay the 
effective date of the Security Directive.
    (f) Each airport operator that receives a Security Directive or an 
Information Circular and each person who receives information from a 
Security Directive or an Information Circular must:
    (1) Restrict the availability of the Security Directive or 
Information Circular, and information contained in either document, to 
those persons with an operational need-to-know.
    (2) Refuse to release the Security Directive or Information 
Circular, and information contained in either document, to persons other 
than those who have an operational need to know without the prior 
written consent of TSA.