EASA AD US-2020-01-11
Air Conditioning - Temperature Control Valve / Control Cabin Trim Air Modulating Valve - Replacement
Airworthiness Directive 2020-01-11 is a final rule issued by the Federal Aviation Administration (FAA) addressing certain Boeing 737-800, -900, and -900ER series airplanes. It mandates the replacement of the left temperature control valve and control cabin trim air modulating valve to prevent in-flight failures that could cause excessive temperatures in the flight deck or passenger cabin. This directive updates and expands the applicability of the previous AD 2017-12-07.