Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Notice of availability, request for comments.

The Federal Aviation Administration (FAA) invites public comments on draft Advisory Circular (AC) 450.131-1 Probability of Failure. The draft AC provides guidance to launch and reentry vehicle operators for performing a probability of failure analysis for the purpose of vehicle operator license applications.

View PDF