Federal Register - December 21, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 242 / Tuesday, December 21, 2021 / Rules and Regulations
release, damage to the engine, and damage to the airplane.
d Subject
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Joint Aircraft System Component JASC
Code 7250, Turbine Section.
f Compliance
e Unsafe Condition This AD was prompted by a report of a quality escape during the manufacturing of an HPT rotor stage 1 disk. The FAA is issuing this AD to prevent failure of the HPT rotor stage 1 disk. The unsafe condition, if not addressed, could result in uncontained disk
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Comply with this AD within the compliance times specified, unless already done.
g Required Actions For all affected engines, at the next engine shop visit or before the HPT rotor stage 1 disk accumulates 7,600 cycles since new,
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whichever occurs first after the effective date of this AD, remove the HPT rotor stage 1 disk from service and replace with a part eligible for installation.
h Definitions For the purpose of this AD:
1 An engine shop visit is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine flanges, except that the separation of engine flanges solely for the
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