[Federal Register: July 13, 2006 (Volume 71, Number 134)]
[Proposed Rules]
[Page 39600-39603]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr13jy06-35]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2006-25327; Directorate Identifier 2006-NM-116-AD]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-
100B SUD, 747-200B, 747-300, 747-400, 747-400D, and 747SR Series
Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to revise an existing airworthiness directive
(AD) that applies to certain Boeing Model 747-100, 747-100B, 747-100B
SUD, 747-200B, 747-300, 747-400, 747-400D, and 747SR series airplanes.
The existing AD currently requires repetitive inspections to detect
cracking of certain lower lobe fuselage frames, and repair if
necessary. This proposed AD would specify appropriate service
information for certain corrective actions. This proposed AD results
from reports indicating that fatigue cracks were found in lower lobe
frames on the left side of the fuselage. We are proposing this AD to
detect and correct fatigue cracking of certain lower lobe fuselage
[[Page 39601]]
frames, which could lead to fatigue cracks in the fuselage skin, and
consequent rapid decompression of the airplane.
DATES: We must receive comments on this proposed AD by August 28, 2006.
ADDRESSES: Use one of the following addresses to submit comments on
this proposed AD.
DOT Docket Web site: Go to http://dms.dot.gov and follow
the instructions for sending your comments electronically.
Government-wide rulemaking Web site: Go to http://www.regulations.gov
and follow the instructions for sending your
comments electronically.
Mail: Docket Management Facility; U.S. Department of
Transportation, 400 Seventh Street SW., Nassif Building, Room PL-401,
Washington, DC 20590.
Fax: (202) 493-2251.
Hand Delivery: Room PL-401 on the plaza level of the
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle,
Washington 98124-2207, for service information identified in this
proposed AD.
FOR FURTHER INFORMATION CONTACT: Ivan Li, Aerospace Engineer, Airframe
Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind
Avenue, SW., Renton, Washington 98055-4056; telephone (425) 917-6437;
fax (425) 917-6590.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to submit any relevant written data, views, or
arguments regarding this proposed AD. Send your comments to an address
listed in the ADDRESSES section. Include docket number ``Docket No.
FAA-2006-25327; Directorate Identifier 2006-NM-116-AD'' at the
beginning of your comments. We specifically invite comments on the
overall regulatory, economic, environmental, and energy aspects of the
proposed AD. We will consider all comments received by the closing date
and may amend the proposed AD in light of those comments.
We will post all comments we receive, without change, to http://dms.dot.gov
, including any personal information you provide. We will
also post a report summarizing each substantive verbal contact with FAA
personnel concerning this proposed AD. Using the search function of
that Web site, anyone can find and read the comments in a docket,
including the name of the individual who sent the comment (or signed
the comment on behalf of an association, business, labor 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), or you may visit
http://dms.dot.gov.
Examining the Docket
You may examine the AD docket on the Internet at http://dms.dot.gov
, or in person at the Docket Management Facility office
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif Building at the DOT
street address stated in the ADDRESSES section. Comments will be
available in the AD docket shortly after the Docket Management System
receives them.
Discussion
On April 20, 2006, we issued AD 2006-09-06, amendment 39-14576 (71
FR 25926, May 3, 2006), for certain Boeing Model 747-100, 747-100B,
747-100B SUD, 747-200B, 747-300, 747-400, 747-400D, and 747SR series
airplanes. That AD requires repetitive inspections to detect cracking
of certain lower lobe fuselage frames, and repair if necessary. That AD
resulted from reports indicating that fatigue cracks were found in
lower lobe frames on the left side of the fuselage. We issued that AD
to detect and correct fatigue cracking of certain lower lobe fuselage
frames, which could lead to fatigue cracks in the fuselage skin, and
consequent rapid decompression of the airplane.
Actions Since Existing AD Was Issued
Since we issued AD 2006-09-06, an operator questioned the addition
of a reference to Boeing Service Bulletin 747-53A2349, Revision 2,
dated April 3, 2003, in paragraph (h)(1) of that AD. A service bulletin
reference in that paragraph was not included in the Notice of Proposed
Rulemaking (NPRM) for AD 2006-09-06, but was added in the final rule to
clarify the requirements of that paragraph. However, the service
bulletin referenced in that paragraph should be Boeing Alert Service
Bulletin 747-53A2408, Revision 1, dated April 4, 2002, rather than
Boeing Service Bulletin 747-53A2349, Revision 2. Therefore, we have
revised paragraph (h)(1) of this NPRM to refer to the correct service
bulletin.
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 airplanes
of this same type design. For this reason, we are proposing this AD,
which would revise AD 2006-09-06 and would retain the requirements of
the existing AD. This proposed AD would revise the service information
referenced in paragraph (h)(1).
Explanation of Editorial Change
We have revised the reference to the Boeing 747-400 Structural
Repair Manual in paragraph (h)(1)(i) of this proposed AD. The paragraph
applies to Group 1 airplanes and should refer to the Boeing 747
Structural Repair Manual because Boeing 747-400 series airplanes are
not in Group 1.
Costs of Compliance
There are about 681 airplanes of the affected design in the
worldwide fleet. This proposed AD would affect about 99 airplanes of
U.S. registry. The new requirements of this proposed AD add no
additional economic burden. The current costs for this AD are repeated
for the convenience of affected operators, as follows:
The actions in this proposed AD take about 2 work hours per
airplane, at an average labor rate of $80 per work hour. Based on these
figures, the estimated cost of both the retained and proposed actions
for U.S. operators is $15,840, or $160 per airplane, per inspection
cycle.
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
[[Page 39602]]
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. Will 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 regulatory evaluation of the estimated costs to
comply with this proposed AD and place it in the AD docket. See the
ADDRESSES section for a location to examine the regulatory evaluation.
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 FAA 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 Federal Aviation Administration (FAA) amends Sec. 39.13 by
removing amendment 39-14576 (71 FR 25926, May 3, 2006) and adding the
following new airworthiness directive (AD):
Boeing: Docket No. FAA-2006-25327; Directorate Identifier 2006-NM-
116-AD.
Comments Due Date
(a) The FAA must receive comments on this AD action by August
28, 2006.
Affected ADs
(b) This AD revises AD 2006-09-06.
Applicability
(c) This AD applies to Boeing Model 747-100, 747-100B, 747-100B
SUD, 747-200B, 747-300, 747-400, 747-400D, and 747SR series
airplanes, certificated in any category, as identified in Boeing
Alert Service Bulletin 747-53A2408, Revision 1, dated April 4, 2002.
Unsafe Condition
(d) This AD results from reports indicating that fatigue cracks
were found in lower lobe frames on the left side of the fuselage. We
are issuing this AD to detect and correct fatigue cracking of
certain lower lobe fuselage frames, which could lead to fatigue
cracks in the fuselage skin, and consequent rapid decompression of
the airplane.
Compliance
(e) You are responsible for having the actions required by this
AD performed within the compliance times specified, unless the
actions have already been done.
Restatement of the Requirements of AD 99-07-12, With Additional
Information for Group 2 Airplanes
Initial Inspections
(f) For airplanes on which the initial detailed internal
inspection of the Section 46 lower lobe frames required by paragraph
(f)(2) or (i)(2) of AD 2005-20-30, amendment 39-14327, has not been
accomplished: Perform a detailed visual inspection to detect
cracking of the lower lobe fuselage frames from Body Station 1820 to
Body Station 2100, in accordance with the Accomplishment
Instructions of Boeing Alert Service Bulletin 747-53A2408, dated
April 25, 1996; or Boeing Alert Service Bulletin 747-53A2408,
Revision 1, dated April 4, 2002; as applicable; at the later of the
applicable times specified in paragraph (f)(1), (f)(2), or (f)(3) of
this AD.
(1) For all airplanes: Prior to the accumulation of 15,000 total
flight cycles; or
(2) For Group 1 airplanes identified in Revision 1 of the
service bulletin: Within 1,500 flight cycles or 18 months after May
5, 1999 (the effective date of AD 99-07-12), whichever occurs first.
(3) For Group 2 airplanes identified in Revision 1 of the
service bulletin: Within 1,500 flight cycles or 18 months after June
7, 2006, whichever occurs first.
Note 1: Paragraphs (f)(2) and (i)(2) of AD 2005-20-30 require a
detailed inspection to detect cracks in the Section 46 lower lobe
frames, in accordance with Boeing Service Bulletin 747-53A2349,
Revision 2, dated April 3, 2003. The initial inspection is required
prior to the accumulation of 22,000 total flight cycles; or within
1,000 flight cycles after June 11, 1993 (the effective date of AD
93-08-12, amendment 39-8559), or November 16, 2005 (the effective
date of AD 2005-20-30), depending on previous inspections
accomplished; whichever occurs later.
Note 2: For the purposes of this AD, a detailed inspection is:
``An intensive examination of a specific item, installation, or
assembly to detect damage, failure, or irregularity. Available
lighting is normally supplemented with a direct source of good
lighting at an intensity deemed appropriate. Inspection aids such as
mirror, magnifying lenses, etc., may be necessary. Surface cleaning
and elaborate procedures may be required.''
Repetitive Inspections
(g) If no cracking is detected during the inspection required by
paragraph (f) of this AD, repeat the inspection thereafter at
intervals not to exceed 3,000 flight cycles.
Corrective Actions
(h) If any cracking is detected during any inspection required
by paragraph (f) of this AD, prior to further flight, accomplish
paragraphs (h)(1) and (h)(2) of this AD:
(1) Within 20 inches of the crack location on the frame, perform
a detailed inspection of the adjacent structure to detect cracking.
As of the effective date of this AD, the detailed inspection must be
done in accordance with Boeing Alert Service Bulletin 747-53A2408,
Revision 1, dated April 4, 2002. If any cracking is detected during
any detailed inspection done in accordance with paragraph (f) or
(h)(1) of this AD, prior to further flight, repair in accordance
with paragraph (h)(1)(i) or (h)(1)(ii) of this AD, as applicable.
(i) For Group 1 airplanes: Using a method approved in accordance
with the procedures specified in paragraph (j) of this AD. The
Boeing 747 Structural Repair Manual, Subject 53-10-04, Figure 67 or
90, is one approved method.
(ii) For Group 2 airplanes: Using a method approved in
accordance with the procedures specified in paragraph (j) of this
AD. The Boeing 747-400 Structural Repair Manual, Subject 53-60-07,
Repair 1 or 2, is one approved method.
(2) Repeat the inspection required by paragraph (f) of this AD
thereafter at intervals not to exceed 3,000 flight cycles.
Optional Terminating Inspection
(i) Accomplishment of the initial detailed inspection of the
Section 46 lower lobe frames required by paragraph (f)(2) or (i)(2)
of AD 2005-20-30 constitutes terminating action for the requirements
of this AD only for airplanes identified in Boeing Alert Service
Bulletin 747-53A2408, Revision 1, dated April 4, 2002, as Group 1
airplanes. Accomplishment of the initial detailed inspection of the
Section 46 lower lobe frames required by paragraph (f) of AD 2006-
05-02 constitutes terminating action for the requirements of this AD
only for airplanes identified in Boeing Alert Service Bulletin 747-
53A2408, Revision 1, dated April 4, 2002, as Group 2 airplanes.
Alternative Methods of Compliance (AMOCs)
(j)(1) The Manager, Seattle Aircraft Certification Office (ACO),
FAA, has the authority to approve AMOCs for this AD, if requested in
accordance with the procedures found in 14 CFR 39.19.
(2) Before using any AMOC approved in accordance with Sec.
39.19 on any airplane to which the AMOC applies, notify the
appropriate principal inspector in the FAA Flight Standards
Certificate Holding District Office.
(3) An AMOC that provides an acceptable level of safety may be
used for any repair required by this AD, if it is approved by an
Authorized Representative for the Boeing Commercial Airplanes
Delegation Option Authorization Organization who has been authorized
by the Manager, Seattle ACO, to make those findings. For a repair
method to be approved, the repair must meet the certification basis
of the airplane.
(4) AMOCs approved previously in accordance with AD 99-07-12,
amendment
[[Page 39603]]
39-11097, are approved as AMOCs for the corresponding provisions of
this AD.
Issued in Renton, Washington, on July 5, 2006.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E6-11019 Filed 7-12-06; 8:45 am]
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