AD 78-26-08

78-26-08 GENERAL ELECTRIC COMPANY: Amendment 39-3376. Applies to all model CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 series A&L, CT58-140-1 and CT58-140-2 turboshaft engines. Compliance required as indicated, unless already accomplished. To prevent failure of the lube pump drive shaft and resultant loss of oil pressure, perform the following in accordance with General Electric Alert Service Bulletin CEB-253 ((CT58) A72-157) dated October 6, 1978, or later FAA approved revision. 1. Engines with new lube and scavenge pumps P/N 4000T98P02, Serial Number NMA-05635, 5724, 5729, 5736, and 5938 through 06151, or with any lube and scavenge pump P/Ns 37D400035P101, 4000T98P01, or 4000T98P02 overhauled after March 1976. (A) Remove from service pumps with 50 hours or less time in service since new or since overhaul within 4 hours operating time after the effective date of this AD. Replace with serviceable pump. (B) Remove from service pumps with over 50 but less than 500hours time in service since new or since overhaul within 50 hours operating time after the effective date of this AD. Replace with serviceable pump. 2. Inspect removed pumps, spare pumps overhauled after March 1976 and new spare pumps in the above serial number range, prior to installation on an engine, in accordance with Section 2B of the bulletin. Remove lip seals marked Viton and replace with new unmarked Sirvene seals and inspect adjacent parts for damage in accordance with the instructions in Section 2B(7) of the bulletin. NOTE: New pumps in the affected serial number range were shipped on new production CT58-140-1 engines, S/Ns 295218 through 295233, 295235 through 295241, 295243 through 295249, and 295255. The manufacturer's service bulletin identified and described in this directive is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer mayobtain copies upon request to Customer Service and Support Manager, General Electric Company, 1000 Western Avenue, Lynn, Massachusetts 01910. This document may also be examined at Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, and FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. This amendment becomes effective December 19, 1978.