[Federal Register Volume 60, Number 98 (Monday, May 22, 1995)]
[Proposed Rules]
[Page 27058]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-12439]



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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39

[Docket No. 93-ANE-57]


Airworthiness Directives; International Aero Engines AG Model 
V2500-A1 Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Proposed rule; withdrawal.

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SUMMARY: This action withdraws a notice of proposed rulemaking (NPRM) 
that proposed a new airworthiness directive (AD), applicable to 
International Aero Engines AG Model V2500-A1 engines. That action would 
have required the installation of damping wires and anti-fret coating 
on high pressure compressor disks and blades. Since the issuance of the 
NPRM, the FAA has determined that the probability of an unsafe 
condition is extremely remote, and that all affected engines in service 
have been modified as proposed. Accordingly, the proposed rule is 
withdrawn.

FOR FURTHER INFORMATION CONTACT: Marc Bouthillier, Aerospace Engineer, 
Engine Certification Office, FAA, Engine and Propeller Directorate, 12 
New England Executive Park, Burlington, MA 01803-5299; telephone (617) 
238-7135, fax (617) 238-7199.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) to add a new airworthiness 
directive (AD), applicable to International Aero Engines AG (IAE) Model 
V2500-A1 engines, was published in the Federal Register on December 1, 
1993 (58 FR 63307). The proposed rule would have required the 
installation of damping wires and an anti-fret coating to high pressure 
compressor (HPC) disks and blades. That action was prompted by seven 
occurrences of HPC stage 7 and 8 blade failures. The proposed actions 
were intended to prevent HPC blade failures, which could result in 
engine inflight shutdowns.
    Since the issuance of that notice of proposed rulemaking (NPRM), 
the FAA has conducted additional airworthiness assessment of the 
described problem, and has determined that the probability of a 
hazardous or unsafe condition is extremely remote. This assessment was 
conducted in accordance with the guidelines of a continued 
airworthiness assessment methodology process currently in use.
    In addition, the FAA has determined that all affected engines have 
been modified as proposed. Accordingly, the proposed rule is hereby 
withdrawn.
    Withdrawal of this notice of proposed rulemaking constitutes only 
such action, and does not preclude the agency from issuing another 
notice in the future, nor does it commit the agency to any course of 
action in the future.
    Since this action only withdraws a notice of proposed rulemaking, 
it is neither a proposed nor a final rule and therefore, is not covered 
under Executive Order 12866, the Regulatory Flexibility Act, or DOT 
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979).

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Withdrawal

    Accordingly, the notice of proposed rulemaking, Docket 93-ANE-57, 
published in the Federal Register on December 1, 1993, (58 FR 63307), 
is withdrawn.

    Issued in Burlington, Massachusetts, on May 15, 1995.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 95-12439 Filed 5-19-95; 8:45 am]
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