SUMMARY: This document extends for six months a requirement that trailers with antilock brake systems be equipped with an external antilock malfunction indicator lamp. This requirement@ which is included in the Federal motor vehicle safety standard that governs vehicles equipped with air brakes@ is currently scheduled to sunset on March 1@ 2009. As a result of this interim final rule@ the sunset date is September 1@ 2009. We are taking this action in connection with our consideration of a petition for rulemaking from the Commercial Vehicle Safety Alliance (CVSA) requesting that the requirement be made permanent. In a separate document@ we are proposing a further extension of the requirement@ to March 1@ 2011. This interim final rule prevents the occurrence of a potential time gap for the vehicles that are subject to the requirement@ should the agency ultimately decide to further extend the time period.