Skip to page content

USA Banner

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.

United States Department of Transportation United States Department of Transportation

AC 20-57A - Automatic Landing Systems (ALS) (Cancelled)

Document Information

Number
20-57A
Title
Automatic Landing Systems (ALS)
Date cancelled
1999-07-13
Cancellation notes
120-28D
Date issued
1971-01-12
Office of Primary Responsibility
ANM-110
Description

0Sets forth an acceptable means of compliance, but not the only means, for the installation approval of automatic landing systems in transport category aircraft, which may be used initially in Category II operations. Approval of these aircraft for use under such conditions will permit the accumulation of data for systems, which may be approved for Category IIIa in the future.

Content