90-15-14 BOEING: Amendment 39-6665. Docket No. 89-NM-249-AD. \n\n\tApplicability: Model 737-300 and 737-400 series airplanes, equipped with Kidde engine fire and overheat detection systems, as listed in Boeing Service Bulletin 737-26-1055, Revision 1, dated September 14, 1989, certificated in any category. \n\n\tCompliance: Required within 18 months after the effective date of the AD unless previously accomplished.\n\n\tTo reduce false engine fire and overheat warnings, which could result in unnecessary engine in-flight shutdowns and airplane diversions that unduly jeopardize continued safe operation of the airplane, accomplish the following: \n\n\tA.\tModify the engine fire and overheat detection system on each engine in accordance with Boeing Service Bulletin 737-26-1055, Revision 1, dated September 14, 1989. \n\n\tB.\tAn alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, SeattleAircraft Certification Office (ACO), FAA, Transport Airplane Directorate. \n\n\tNOTE: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Seattle ACO. \n\n\tC.\tSpecial flight permits may be issued in accordance with FAR Sections 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. \n\n\tAll persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. \n\n\tThis amendment (39-6665, AD 90-15-14) becomes effective on August 23, 1990.