Turbine Wheels By P/N
Effective Date - 01/13/1988
as indicated, unless previously accomplished. To prevent turbine wheel
separation and resulting containment shroud fragmentation, accomplish
B. Installation of the Hastelloy S turbine shroud, in accordance with Garrett Service Bulletin 85-49-5700, dated July 20, 1987, or later FAA approved revisions, is considered an acceptable alternate means of compliance with this AD.
C. An alternate means of compliance with this AD which provides an acceptable level of safety may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.
D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a base to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Garrett Aviation Services Company, Data Distribution, Department H64-5, P.O. Box 29003, Phoenix, Arizona 85038. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or at 4344 Donald Douglas Drive, Long Beach, California. This amendment becomes effective January 13, 1988.