[Federal Register: December 12, 2005 (Volume 70, Number 237)]
[Proposed Rules]
[Page 73391-73392]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr12de05-18]
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Proposed Rules
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.
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[[Page 73391]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 95-ANE-10-AD]
RIN 2120-AA64
Airworthiness Directives; General Electric Company CF6 Series
Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to supersede an existing airworthiness
directive (AD) for General Electric Company (GE) CF6-45/-50 series
turbofan engines. That AD currently requires an initial and repetitive
on-wing visual inspection of the side links of the five-link forward
mount assembly for cracks, and replacement of the side links and pylon
attachment bolts and inspection of the fail-safe bolt and platform lug
if the side links are cracked. That AD also requires a shop-level
refurbishment of the side links as a terminating action to the on-wing
inspection program. This proposed AD would require inspecting and
refurbishing the side link at every exposure of the side link. This
proposed AD would also require the same actions on certain part number
side links installed on CF6-80A turbofan engines. This proposed AD
results from a report of a cracked side link. We are proposing this AD
to prevent failure of the side links and possible engine separation
from the airplane.
DATES: We must receive any comments on this proposed AD by February 10,
2006.
ADDRESSES: Use one of the following addresses to comment on this
proposed AD:
By mail: Federal Aviation Administration (FAA), New
England Region, Office of the Regional Counsel, Attention: Rules Docket
No. 95-ANE-10-AD, 12 New England Executive Park, Burlington, MA 01803-
5299.
By fax: (781) 238-7055.
By e-mail: 9-ane-adcomment@faa.gov.
You can get the service information identified in this proposed AD
from General Electric Aircraft Engines, CF6 Distribution Clerk, Room
132, 111 Merchant Street, Cincinnati, OH 45246.
You may examine the AD docket at the FAA, New England Region,
Office of the Regional Counsel, 12 New England Executive Park,
Burlington, MA.
FOR FURTHER INFORMATION CONTACT: Karen Curtis, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803-5299; telephone (617)
238-7192; fax (617) 238-7199.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send any written relevant data, views, or
arguments regarding this proposal. Send your comments to an address
listed under ADDRESSES. Include ``AD Docket No. 95-ANE-10-AD'' in the
subject line of your comments. If you want us to acknowledge receipt of
your mailed comments, send us a self-addressed, stamped postcard with
the docket number written on it; we will date-stamp your postcard and
mail it back to you. We specifically invite comments on the overall
regulatory, economic, environmental, and energy aspects of the proposed
AD. If a person contacts us verbally, and that contact relates to a
substantive part of this proposed AD, we will summarize the contact and
place the summary in the docket. We will consider all comments received
by the closing date and may amend the proposed AD in light of those
comments.
Examining the AD Docket
You may examine the AD Docket (including any comments and service
information), by appointment, between 8:00 a.m. and 4:30 p.m., Monday
through Friday, except Federal holidays. See ADDRESSES for the
location.
Discussion
On August 15, 1995, the FAA issued AD 95-17-15, Amendment 39-9346
(60 FR 46758, September 8, 1995). That AD requires an initial and
repetitive on-wing visual inspection of the side links of the five-link
forward mount assembly for cracks, and replacement of the side links
and pylon attachment bolts and inspection of the fail-safe bolt and
platform lug, if side links are found cracked. That AD also requires a
shop-level refurbishment of the side links as a terminating action to
the on-wing inspection program. That AD was the result of six reports
of cracked side links detected during routine engine shop visits. That
condition, if not corrected, could result in failure of the side links
and possible engine separation from the airplane.
Actions Since We Issued AD 95-17-15
Since we issued AD 95-17-15, a routine inspection at a shop visit
found a cracked side link. A review of the records of the cracked part
showed that it was previously refurbished and was in compliance with AD
95-17-15. That AD required initial and repetitive on-wing inspection of
the CF6-45/50 side links until refurbished using GE Service Bulletin
72-1092, dated November 18, 1994. Refurbishment includes reapplication
of the protective Sermetel W coating. That AD didn't specify any
repetitive refurbishment. That AD also didn't include initial or
repetitive inspections of the side links installed on CF6-80A series
engines, even though some P/Ns are common to both engine series. The
manufacturer previously issued several documents including Commercial
Engine Services Memoranda (CESM) 201, All Operator Wires, and service
bulletins recommending inspecting and refurbishing the side links per
the engine manual at each piece part exposure for both the CF6-45/-50
and the CF6-80A series engines. The manufacturer recently issued
temporary revisions to Chapter 5 of the Airworthiness Limitations
sections of the CF6-45/-50 and CF6-80A engine manuals to require
inspecting and refurbishing the side links every time one or more of
the bolts attaching the side link to the fan frame-front high pressure
compressor case or the bolt attaching the side link to the mount
platform are removed.
Relevant Service Information
We have reviewed and approved the technical contents of GE Aircraft
[[Page 73392]]
Engines (GEAE) Service Bulletins CF6-50 S/B 72-1255, dated January 26,
2005, and CF6-80A S/B 72-0797, dated January 26, 2005, that describe
procedures for inspecting and refurbishing the side links.
FAA's Determination and Requirements of the Proposed AD
We have evaluated all pertinent information and identified an
unsafe condition that is likely to exist or develop on other products
of this same type design. We are proposing this AD, which would require
inspecting and refurbishing the side links at each exposure of the side
link. The proposed AD would require that you do these actions using the
service information described previously.
Costs of Compliance
We estimate that this proposed AD would affect 195 engines
installed on U.S. registered airplanes per year. We also estimate that
it would take 8.0 work hours per engine to perform the proposed
actions, and that the average labor rate is $65 per work hour. This AD
does not require parts. Based on these figures, we estimate the total
cost of the proposed AD to U.S. operators to be $101,400 per year.
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 proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not
have a substantial direct effect on the States, on the relationship
between the national Government and the States, or on the distribution
of power and responsibilities among the various levels of government.
For the reasons discussed above, I certify that the proposed
regulation:
1. Is not a ``significant regulatory action'' under Executive Order
12866;
2. Is not a ``significant rule'' under the DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979); and
3. Would not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
We prepared a summary of the costs to comply with this proposal and
placed it in the AD Docket. You may get a copy of this summary by
sending a request to us at the address listed under ADDRESSES. Include
``AD Docket No. 95-ANE-10-AD'' in your request.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Safety.
The Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the Federal Aviation Administration proposes to amend 14
CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. The FAA amends Sec. 39.13 by removing Amendment 39-9346 (60 FR
46758, September 8, 1995) and by adding a new airworthiness directive
to read as follows:
General Electric Company: Docket No. 95-ANE-10-AD.
Comments Due Date
(a) The Federal Aviation Administration (FAA) must receive
comments on this airworthiness directive (AD) action by February 10,
2006.
Affected ADs
(b) This AD supersedes AD 95-17-15, Amendment 39-9346.
Applicability
(c) This AD applies to General Electric (GE) CF6-45/-50 and CF6-
80A turbofan engines with left-hand side links part numbers (P/Ns)
9204M94P01, 9204M94P03, and 9346M99P01, and right-hand side links,
P/Ns 9204M94P02, 9204M94P04, and 9346M99P02, installed on the five-
link forward engine mount assembly (also known as Configuration 2).
These engines are installed on, but not limited to, Boeing DC10-15,
DC10-30, 767, and 747 series airplanes and Airbus Industrie A300 and
A310 series airplanes.
Unsafe Condition
(d) This AD results from a report of a cracked side link. We are
issuing this AD to prevent failure of the side links and possible
engine separation from the airplane.
Compliance
(e) You are responsible for having the actions required by this
AD performed at every exposure of the side link.
Inspecting and Refurbishing the Side Links
(f) Inspect and refurbish each side link at every exposure of
the side links. Use the following GE Aircraft Engines (GEAE) service
bulletins (SBs):
(1) For CF6-45/-50 series engines, use 3.A. through 3.E. of the
Accomplishment Instructions of GEAE SB CF6-50 S/B 72-1255, dated
January 26, 2005.
(2) For CF6-80A series engines, use 3.A. through 3.E. of the
Accomplishment Instructions of GEAE SB CF6-80A S/B 72-0797, dated
January 26, 2005.
Definition of Exposure of Side Link
(g) A side link is exposed when one or more bolts that attach
the side links to the fan frame--front high pressure compressor case
are removed, or when the bolt attaching the side link to the mount
platform is removed.
Alternative Methods of Compliance
(h) The Manager, Engine Certification Office, has the authority
to approve alternative methods of compliance for this AD if
requested using the procedures found in 14 CFR 39.19.
Related Information
(i) None.
Issued in Burlington, Massachusetts, on December 1, 2005.
Peter A. White,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 05-23898 Filed 12-9-05; 8:45 am]
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