AD 78-07-06

78-07-06 GENERAL ELECTRIC COMPANY: Amendment 39-3169. Applies to CJ610-5 and -6 turbojet and CF700-2C, -2D, and -2D-2 turbofan engines with compressor disks identified by serial numbers below.

Compliance required prior to further flight, unless already accomplished.

To prevent low cycle fatigue failure of compressor disks suspected to have improper material accomplish the following:

1. Remove from service sixth stage compressor disks, P/N 37D401316P101, and seventh stage compressor disks, P/N 37D401317P101, having serial numbers listed below and replace with serviceable disks:

Serial Numbers:

Stage 6: 07911, 07932.

Stage 7: 08742 08745 08756 08760 08761 08767 08806 08815 08818 08822 08825 08826 08832 08849 08851 08853 08867 08873 08876 08879 08891 08895 08897 08899 09120 09127 09145

2. Inspect first stage compressor disks, P/Ns 37E501428P102 and 37E501428P106, with serial numbers listed below for material properties in accordance with General Electric Company CJ610 engine Alert Service Bulletin No. (CJ610) A72-130, dated March 8, 1978, or CF700 engine Alert Service Bulletin No. (CF700) A72-140, dated March 8, 1978, as appropriate, or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region:

Serial Numbers: 09804, 09811, 09818, 09825, 09847, 09861.

3. Disks determined to be satisfactory per General Electric Company inspection procedures may be returned to service. Replace unsatisfactory disks with serviceable disks.

4. Disks removed from service are to be forwarded to General Electric Company for evaluation. The manufacturer's service bulletins identified and described in this directive are 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 these documents from the manufacturer may obtain copies upon request to Customer Service and Support Manager, General Electric Company, 1000 Western Avenue, Lynn, Massachusetts 01910. These documents may also be examined at Federal Aviation Administration, New England Region, 12 New England Executive Part, Burlington, Massachusetts 01803, and FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C.

This amendment becomes effective upon publication in the Federal Register.