57-03-02 DOUGLAS AND LOCKHEED: Applies to Lockheed Constellation Series Airplanes and Douglas DC-7 Series Airplanes With Wright Engines.\n\n\tCompliance required not later than December 1, 1957.\n\n\tUnder certain cold weather operating conditions it is possible for the fuel inlet strainer and other parts in the engine master control to become clogged with ice as a result of entrained water in the fuel freezing on the screen. This has caused a loss of power on all engines simultaneously.\n\n\tTo relieve strainer icing, a screen having a bypass valve Bendix P/N 366204 should be installed in replacement of the screen not having a bypass valve. Bendix Service Bulletin No. 797 covers this subject. It should be noted that the incorporation of the screen with bypass will not positively prevent power loss from fuel ice; therefore, work is continuing to develop a means to protect other portions of the master control downstream of the inlet strainer. If necessary, a supplement to this notewill be published when additional information becomes available.