1 Scope

1.1 These requirements cover the rules and procedures for the life time extension of wind turbines (LTE).

1.2 These requirements cover the process to obtain risk by relating the severity to their confidence level on accuracy for the failure mode.

1.3 Commercial aspects of wind farm operation are not covered by this Outline of Investigation.

1.4 These requirements are applicable to the on-shore wind turbines.

Summary of Topics

This revision of ANSI/UL 4143 dated March 12, 2024 is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS). No technical changes have been made.