Summary
We are adopting a new airworthiness directive (AD) for certain Honeywell International Inc. ALF502L-2C, ALF502R-3, ALF502R-3A, ALF502R-5, LF507-1F, and LF507-IH turbofan engines. This AD requires removing from service certain second stage high pressure compressor (HPC2) discs. This AD was prompted by a report of cracks found in an HPC2 disc during routine inspection. We are issuing this AD to prevent the affected discs from fracturing before reaching the currently published life limit. A disc fracture could result in an uncontained failure of the disc and damage to the airplane.
Directive Details
AD Number
FAA-2011-1261
Document Number
2011-30575
Type
Rule
Publication Date
November 29, 2011
Effective Date
December 14, 2011
Affected Manufacturer
Honeywell International Inc. Turbofan
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2011-1261
Topics
Official Documents
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