80-03-06 GENERAL ELECTRIC: Amendment 39-3683. Applies to General Electric CF6-6 series engines, Stage 2 HPT disks, Part Numbers 9083M48P01, 9084M52P02, 9084M52P05, 9137M15P01, and 9137M15P02. Compliance is required as indicated. To preclude disk failure due to fatigue, these disks are to be removed from service as follows:
(a) All disks, except those noted in (c) below, which have more than 8400 cycles on the effective date of this AD are to be removed from service within 100 cycles.
(b) All disks, except those noted in (c) below, which have less than 8400 cycles are to be removed before they accrue 8500 cycles.
(c) Those disks, P/N 9137M15P02, with Serial Numbers MP036073, MP030786, MP030797, MP035005, and RPO24722 because of their refurbishment schedule shall be removed from service before they accrue 8800 cycles.
(d) Other disks than those identified in (c) above may be allowed additional cycles on an individual basis when approved by the Chief, Engineering and Manufacturing Branch, FAA, Great Lakes Region.
CF6-6 Service Bulletin 72-761 dated November 28, 1979 also applies to this subject.
This amendment becomes effective on February 8, 1980.