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proposed rule by submitting such
written data, views, or arguments as
they may desire. Communications
should identify the Rules Docket
number and be submitted to the address
specified above. All communications
received on or before the closing date
for comments, specified above, will be
considered before taking action on the
proposed rule. The proposals contained
in this action may be changed in light
of the comments received.
Comments are specifically invited on
the overall regulatory, economic,
environmental, and energy aspects of
the proposed rule. All comments
submitted will be available, both before
and after the closing date for comments,
in the Rules Docket for examination by
interested persons. A report
summarizing each FAA-public contact
concerned with the substance of this
proposal will be filed in the Rules
Docket.
Commenters wishing the FAA to
acknowledge receipt of their comments
submitted in response to this action
must submit a self-addressed, stamped
postcard on which the following
statement is made: ‘‘Comments to
Docket Number 98–ANE–49–AD.’’ The
postcard will be date stamped and
returned to the commenter.
Availability of NPRM’s
Any person may obtain a copy of this
NPRM by submitting a request to the
FAA, New England Region, Office of the
Regional Counsel, Attention: Rules
Docket No. 98–ANE–49–AD, 12 New
England Executive Park, Burlington, MA
01803–5299.
Discussion
On April 14, 2000, the FAA issued
AD 2000–08–12, Amendment 39–11698
(65 FR 21638, April 24, 2000), to require
revisions to the Life Limits Section of
the manufacturer’s Instructions for
Continued Airworthiness (ICA) for
General Electric Company (GE) CF6–
80A, CF6–80C2, and CF6–80E1 series
turbofan engines to include required
enhanced inspection of selected critical
life-limited parts at each piece-part
exposure.
Additional Inspection Procedures
Since the issuance of that AD, an FAA
study of in-service events involving
uncontained failures of critical rotating
engine parts has indicated the need for
additional mandatory inspections. The
mandatory inspections are needed to
identify those critical rotating parts with
conditions, which if allowed to
continue in service, could result in
uncontained engine failures. This
proposal would modify the
airworthiness limitations section of the
manufacturer’s manual and an air
carrier’s approved continuous
airworthiness maintenance program to
incorporate additional inspection
requirements.
This proposal will also differentiate
between standard HPTR and R88DT
HPTR inspections and add a dovetail
slot bottom eddy current inspection for
the -80C2 HPT Stage 1 disk.
Proposed Actions
Since an unsafe condition has been
identified that is likely to exist or
develop on other products of this same
type design, the proposed AD would
supersede AD 2000–08–12 to add
additional inspections for certain HPC,
LPT and HPT components. These
inspections would be required at each
piece-part opportunity.
Economic Analysis
The FAA estimates that 790 engines
installed on airplanes of US registry
would be affected by this proposed AD,
that it would take approximately 10
work hours per engine to accomplish
the proposed additional inspections and
that the average labor rate is $60 per
work hour. The total cost of the new
inspections per engine would be
approximately $600. The FAA estimates
that there will be approximately 327
shop visits per year that result in piecepart-
exposure of the added affected
components, therefore, the total annual
cost for the additional inspections is
estimated to be $196,200.
Regulatory Analysis
This proposed rule does not have
federalism implications, as defined in
Executive Order 13132, because it
would not have a substantial direct
effect on the States, on the relationship
between the national government and
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Federal Register / Vol. 66, No. 194 / Friday, October 5, 2001 / Proposed Rules 50907
the States, or on the distribution of
power and responsibilities among the
various levels of government.
Accordingly, the FAA has not consulted
with state authorities prior to
　
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