SAS External Portal: EFFECTIVE FEBRUARY 20, 2018 - Use of the SAS External Portal for Initial Certification is voluntary for CFR Parts 121, 135, and 145 until further notice. For additional information, please refer to Notice N 8900.451, Policy Change for Applicants/Certificate Holders Submitting Information Using the SAS External Portal and Data Collection Tools. Additional resources to help Certificate Holders and Applicants (CH/As) use the SAS External Portal include training for CH/As and the SAS External Portal Information Guide, both available free of charge.