Airworthiness Directive · Amendment 39-16875 · Honeywell International Inc. Turbofan Engines
Honeywell International Inc. Turbofan Engines
This AD applies to Honeywell International Inc. ALF502L-2C, ALF502R-3, ALF502R-3A, ALF502R-5, LF507-1F, and LF507-IH turbofan engines with any of the second stage high pressure compressor (HPC2) discs, part number (P/N) 2-101-332-12, serial numbers (S/N) listed in Table 2 of Honeywell International Inc. Service Bulletin (SB) No. ALF/LF-72-1113, dated September 16, 2011, installed.
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.
Comply with this AD before accumulating 4,500 cycles-since-new on the affected HPC2 disc, or before exceeding 7 years after the effective date of this AD, whichever occurs first, unless already done.
Remove from service HPC2 discs, P/N 2-101-332-12, S/Ns listed in Table 2 of Honeywell International Inc. SB No. ALF/LF-72-1113, dated September 16, 2011.
