96-04-11 R1: Fuel Flow Governors

96-04-11R1 BOEING: Amendment 39-10887. Docket 96-NM-30-AD. Revises AD 96-04-11, amendment 39-9523.\n\n\tApplicability: Model 757-200 series airplanes, equipped with Rolls Royce Model RB211- 535E4/E4B engines; certificated in any category. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tTo reduce the risk of engine rundown during idle descents, accomplish the following: \n\t(a)\tWithin 30 days after the effective date of this AD, revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to include the following statement. \n \nThis may be accomplished by inserting a copy of this AD in the AFM. \n\n\n"Limitations Section 1 \n\nIn order to reduce the risk of engine rundown during idle descents, activate the engine cowl thermal anti-ice system for both engines prior to idle descents above flight level (FL) 200. Below FL 200, use normal engine cowl thermal anti-ice system procedures (as defined in the AFM). \n\nNOTE: The Master Minimum Equipment List (MMEL) for Model 757 series airplanes currently specifies that an airplane may be dispatched with an engine anti-ice valve locked in the closed position. The requirement of this section to activate the engine cowl thermal anti-ice system prior to descent will prevent the dispatch of airplanes with an engine anti-ice valve locked in the closed or open position. Where differences exist between the current specification of the MMEL and the requirements of this AFM limitation, the AFM limitation prevails." \n\n\tNOTE 1: AD 97-02-12, amendment 39-9897, requires installation of improved fuel flow governors (FFG) on both engines of Boeing Model 757-200 series airplanes. Accomplishment of this installation constitutes terminating action for the requirement of this AD.\n\n\t(b)\tAn alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Seattle Aircraft Certification Office (ACO),FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Operations Inspector, who may add comments and then send it to the Manager, Seattle ACO. \n\n\tNOTE 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. \n\n\t(c)\tSpecial flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. \n\n\t(d)\tThis amendment becomes effective on November 30, 1998.