G/TBT/N/USA/1952/Add.1  
 
3 March 2023  
(23-1497) Page: 1/2 
Committee on Technical Barriers to Trade  Original: English  
 
 
NOTIFICATION  
Addendum  
The following communication , dated  3 March 2023, is being circulated at the request of the 
delegation of the United States of America . 
 
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Title:  System Safety Assessments  
 
Reason for Addendum:  
[X] Comment period changed - date:  24 April 2023; 
https://www.govinfo.gov/content/pkg/FR -2023-03-02/html/2023 -04265.htm  
https://www.govinfo.gov/content/pkg/FR -2023-03-02/pdf/2023 -04265.pdf  
[ ] Notified measure adopted - date:  
[ ] Notified measure published - date:  
[ ] Notified measure enters into force - date:  
[ ] Text of final measure available from1:  
[ ] Notified measure withdrawn or revoked - date:  
Relevant symbol if measure re -notified:   
[ ] Content or scope of notified measure changed  and text available from1:  
New deadline for comments (if applicable):   
[ ] Interpretive guidance issued and text available from1:  
[ ] Other:  
 
Description:  AGENCY: Federal Aviation Administration (FAA), Department of Transportation (DOT)  
ACTION: Notice of proposed rulemaking (NPRM); extension of public comment period  
SUMMARY: This action extends the comment period for the NPRM titled "System Safe ty 
Assessments," that was published on 8 December 2022. In that document, the FAA proposed to 
amend certain airworthiness regulations to standardize the criteria for conducting safety 
assessments for systems, including flight controls and powerplants, inst alled on transport category 
airplanes . With this action, the FAA seeks to reduce risk associated with airplane accidents and 
incidents that have occurred in service, and reduc e risk associated with new technology in flight 
control systems. The intended effect of this proposed action is to improve aviation safety by making 
system safety assessment (SSA) certification requirements more comprehensive and consistent. The 
FAA is ext ending the comment period closing date to allow commenters additional time to analyze 
the proposed rule and prepare a response.  
 
1 This information can be provided by including a website address, a pdf attachment, or other 
information on where the text of the final /modified  measure and/or interpretive guidance can be obtained.  G/TBT/N/USA/1952/Add.1  
 
- 2 - 
 
  DATES: The comment period for the NPRM published on 8 December 2022, at 87 FR 75424  (notified 
in G/TBT/N/USA/1952 ), and scheduled to close on 8 March 2023, is extended until 24 April 2023.  
WTO Members and their stakeholder s are asked to submit comments to the USA TBT Enquiry Point  
by or before 4pm Eastern Time  on 24 April 2023. Comments received by the USA TBT Enquiry Point 
from WTO Members and their stakeholders will be shared with the regulator and will also be 
submitted to the Docket  on Regulations.gov  if received within the comment period.  
This action and the NPRM notified in G/TBT/N/USA/1952  are identified by Docket Number FAA -2022-
1544. The Docket Folder is available on Regulations.gov at 
https://www.regulations.gov/docket/FAA -2022-1544/document  and provides access to primary and 
supporting documents as well as comments received. Documents are also accessible from 
Regulat ions.gov  by searching the Docket Number.  
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