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by CFM56-5B1/P turbofan engines experienced HPC stalls in both engines during climb out after
takeoff. The flight crew restored power to both engines by retarding the throttles to flight idle. The
crew continued the climb out phase of the flight, declared an emergency, and returned to the airport
without incident. This condition, if not corrected, could result in HPC stalls, which could prevent
continued safe flight or landing.
FAA's Determination and Requirements of This AD
The unsafe condition described previously is likely to exist or develop on other CFM
International, S. A. CFM56-5B series turbofan engines of the same type design. For that reason, we
are issuing this AD to prevent HPC stalls, which could prevent continued safe flight or landing. This
AD requires the following:
• Reviewing EGT monitoring records to determine EGT deterioration margin; and
• For airplanes where both engines have greater than 80 °C deterioration of EGT margin, doing the
following:
• Borescope-inspecting HPC stages 1, 3, 6, and 9 of both engines.
• Removing from service any engine that does not pass the borescope inspection; and
• If both engines pass the borescope inspection, then removing one of the engines from service and
replacing it with an engine that has 80 °C or less deterioration of EGT margin.
FAA's Determination of the Effective Date
Since an unsafe condition exists that requires the immediate adoption of this AD, we have found
that notice and opportunity for public comment before issuing this AD are impracticable, and that
good cause exists for making this amendment effective in less than 30 days.
Interim Actions
These actions are interim actions and we anticipate further rulemaking actions in the future,
including further action to address the remaining engines in service that are above 80 °C deterioration
of EGT margin.
Comments Invited
This AD is a final rule that involves requirements affecting flight safety and was not preceded by
notice and an opportunity for public comment; however, we invite you to send us any written relevant
data, views, or arguments regarding this AD. Send your comments to an address listed under
ADDRESSES. Include ''AD Docket No. FAA-2008-1353; Directorate Identifier 2008-NE-46-AD'' in
the subject line of your comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of the rule that might suggest a need to modify it.
We will post all comments we receive, without change, to http://www.regulations.gov, including
any personal information you provide. We will also post a report summarizing each substantive
verbal contact with FAA personnel concerning this AD. Using the search function of the Web site,
anyone can find and read the comments in any of our dockets, including, if provided, the name of the
individual who sent the comment (or signed the comment on behalf of an association, business, labor
3
union, etc.). You may review the DOT's complete Privacy Act Statement in the Federal Register
published on April 11, 2000 (65 FR 19477-78).
Examining the AD Docket
You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at
the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and
other information. The street address for the Docket Operations office (telephone (800) 647-5527) is
the same as the Mail address provided in the ADDRESSES section. Comments will be available in
the AD docket shortly after receipt.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety.
Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation
Programs, describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III,
Section 44701, ''General requirements.'' Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices,
methods, and procedures the Administrator finds necessary for safety in air commerce. This
regulation is within the scope of that authority because it addresses an unsafe condition that is likely
to exist or develop on products identified in this rulemaking action.
Regulatory Findings
We have determined that this AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States, on the relationship between the
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