[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: 49CFR1544.305]

[Page 344]
 
                        TITLE 49--TRANSPORTATION
 
   CHAPTER XII--TRANSPORTATION SECURITY ADMINISTRATION, DEPARTMENT OF 
                            HOMELAND SECURITY
 
PART 1544_AIRCRAFT OPERATOR SECURITY: AIR CARRIERS AND COMMERCIAL 
OPERATORS--Table of Contents
 
                  Subpart D_Threat and Threat Response
 
Sec. 1544.305  Security Directives and Information Circulars.

    (a) TSA may issue an Information Circular to notify aircraft 
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 aircraft operator required to have an approved aircraft 
operator security program must comply with each Security Directive 
issued to the aircraft operator by TSA, within the time prescribed in 
the Security Directive for compliance.
    (c) Each aircraft 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 aircraft operator is unable to implement 
the measures in the Security Directive, the aircraft operator must 
submit proposed alternative measures and the basis for submitting the 
alternative measures to TSA for approval. The aircraft operator must 
submit the proposed alternative measures within the time prescribed in 
the Security Directive. The aircraft operator must implement any 
alternative measures approved by TSA.
    (e) Each aircraft 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 aircraft operator that receives a Security Directive or 
Information Circular and each person who receives information from a 
Security Directive or 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 with an operational need-to-know without the prior written 
consent of TSA.

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