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[Federal Register: August 13, 2007 (Volume 72, Number 155)]
[Rules and Regulations]
[Page 45151-45153]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr13au07-3]
––––––––––––––––––––––––––––––––––
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2007-28940; Directorate Identifier 2007-NM-131-AD; Amendment 39-15158;
AD 2007-16-19]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 747-200B, 747-300, and 747-400 Series Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule; request for comments.
––––––––––––––––––––––––––––––––––
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model
747-200B, 747-300, and 747-400 series airplanes. This AD requires doing repetitive detailed
inspections for cracking of the aft tension tie channels from body station (BS) 1120 to BS 1220 and
from BS 880 to BS 1100, and corrective actions if necessary. This AD results from cracks found in
the aft tension tie channels at four station locations, on a Model 747-200B series airplane that had
been modified to a special freighter. We are issuing this AD to detect and correct cracking of the aft
tension tie channels; failure of more than one tension tie could result in rapid depressurization of the
airplane.
DATES: This AD becomes effective August 28, 2007.
The Director of the Federal Register approved the incorporation by reference of certain
publications listed in the AD as of August 28, 2007.
We must receive comments on this AD by October 12, 2007.
ADDRESSES: Use one of the following addresses to submit comments on this 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: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground
Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.
• Fax: (202) 493-2251.
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• Hand Delivery: Room W12-140 on the ground floor of the West Building, 1200 New Jersey
Avenue, SE., 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 AD.
FOR FURTHER INFORMATION CONTACT: Ivan Li, Aerospace Engineer, Airframe Branch,
ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton,
Washington 98057-3356; telephone (425) 917-6437; fax (425) 917-6590.
SUPPLEMENTARY INFORMATION:
Discussion
We have received a report indicating that cracks were found in the aft tension tie channels at four
station locations, on a Model 747-200B series airplane that had been modified to a special freighter.
The cracks were found near the body frames at a location where the flanges of the aft tension tie
channels are machined down to a flat plate in order to attach to the body frames. The largest crack
was approximately 0.5 inch in length. The airplane had accumulated 4,856 flight cycles since
modification to special freighter. Tension ties are considered to be structurally significant, in that they
are critical to airplane structural integrity. Failure of more than one tension tie, if not corrected, could
result in rapid depressurization of the airplane.
The upper deck tension ties on Model 747-300 and -400 series airplanes that have been modified
to a special freighter configuration are similar to those on the affected Model 747-200B series
airplanes that have been modified to a special freighter configuration. Therefore, all of these airplanes
are subject to the same unsafe condition.
Relevant Service Information
We have reviewed Boeing Alert Service Bulletin 747-53A2610, dated May 10, 2007. The
service bulletin describes procedures for doing repetitive detailed inspections for cracking of the aft
tension tie channels from body station (BS) 1120 to BS 1220 and from BS 880 to BS 1100, and doing
corrective actions as applicable. The corrective actions include repairing any crack found in a tension
tie, and contacting Boeing for repair instructions if any crack is found in a bolt hole. The service
bulletin specifies that, as an option to accomplishing the repetitive detailed inspections,
accomplishing the repairs at all tension tie locations can be done as a preventive modification.
The service bulletin specifies accomplishing the initial inspection from BS 1120 to BS 1220
before the accumulation of 4,000 flight cycles since modification to special freighter or converted
freighter, or within 1,000 flight cycles after the date on the service bulletin, whichever occurs later.
The service bulletin specifies accomplishing the initial inspection from BS 880 to BS 1100 before the
accumulation of 8,000 flight cycles since modification to special freighter or converted freighter, or
within 1,000 flight cycles after the date on the service bulletin, whichever occurs later. The service
bulletin also specifies repeating the inspections at intervals not to exceed 4,000 flight cycles. The
service bulletin also specifies repairing any crack before further flight.
Accomplishing the actions specified in the service information is intended to adequately address
the unsafe condition.
FAA's Determination and Requirements of This AD
The unsafe condition described previously is likely to exist or develop on other airplanes of the
same type design that may be registered in the U.S. at some time in the future. Therefore, we are
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issuing this AD to detect and correct cracking of the aft tension tie channels; failure of more than one
tension tie could result in rapid depressurization of the airplane. This AD requires accomplishing the
actions specified in the service information described previously, except as discussed under
''Difference Between the AD and Service Bulletin.''
Difference Between the AD and Service Bulletin
The service bulletin specifies to contact the manufacturer for instructions on how to repair
certain conditions, but this proposed AD would require repairing those conditions in one of the
following ways:
• Using a method that we approve; or
• Using data that meet the certification basis of the airplane, and that have been approved by an
Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization
Organization whom we have authorized to make those findings.
Costs of Compliance
If an affected airplane is imported and placed on the U.S. Register in the future, the required
inspections would take about 4 work hours per airplane, at an average labor rate of $80 per work
hour. Based on these figures, the estimated cost of the AD would be $320 per airplane, per inspection
cycle.
FAA's Determination of the Effective Date
No airplane affected by this AD is currently on the U.S. Register. Therefore, providing notice
and opportunity for public comment is unnecessary before this AD is issued, and this AD may be
made effective in less than 30 days after it is published in the Federal Register.
Comments Invited
This AD is a final rule that involves requirements that affect flight safety and was not preceded
by notice and an opportunity for public comment; however, we invite you to submit any relevant
written data, views, or arguments regarding this AD. Send your comments to an address listed under
the ADDRESSES section. Include ''Docket No. FAA-2007-28940; Directorate Identifier 2007-NM131-AD'' at the beginning of your comments. We specifically invite comments on the overall
regulatory, economic, environmental, and energy aspects of the AD that might suggest a need to
modify it.
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 AD. Using the search function of that web site, anyone
can find and read the comments in any of our dockets, 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
Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The
Docket Operations office (telephone (800) 647-5527) is located on the ground level of the West
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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.
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
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 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 AD and placed 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, Incorporation by reference, Safety.
Adoption of the Amendment
Accordingly, under the authority delegated to me by the Administrator, the FAA amends 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.
§ 39.13 [Amended]
2. The Federal Aviation Administration (FAA) amends § 39.13 by adding the following new
airworthiness directive (AD):
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FAA
Aircraft Certification Service
AIRWORTHINESS DIRECTIVE
www.faa.gov/aircraft/safety/alerts/
www.gpoaccess.gov/fr/advanced.html
2007-16-19 Boeing: Amendment 39-15158. Docket No. FAA-2007-28940; Directorate Identifier
2007-NM-131-AD.
Effective Date
(a) This AD becomes effective August 28, 2007.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Boeing Model 747-200B, 747-300, and 747-400 series airplanes,
certificated in any category; as identified in Boeing Alert Service Bulletin 747-53A2610, dated May
10, 2007.
Unsafe Condition
(d) This AD results from cracks found in the aft tension tie channels at four station locations, on
a Model 747-200B series airplane that had been modified to a special freighter. We are issuing this
AD to detect and correct cracking of the aft tension tie channels; failure of more than one tension tie
could result in rapid depressurization 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.
Repetitive Inspections
(f) At the applicable times specified in paragraph 1.E. of Boeing Alert Service Bulletin 74753A2610, dated May 10, 2007, except as provided by paragraph (g) of this AD: Do repetitive detailed
inspections for cracking of the aft tension tie channels from body station (BS) 1120 to BS 1220 and
from BS 880 to BS 1100, and do all applicable corrective actions, by accomplishing all of the
applicable actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin
747-53A2610, dated May 10, 2007, except as provided by paragraph (h) of this AD.
Exception to Compliance Times
(g) Where Boeing Alert Service Bulletin 747-53A2610, dated May 10, 2007, specifies counting
the compliance time from ''* * * after the date on this service bulletin,'' this AD requires counting the
compliance time from the effective date of this AD.
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Exception for Bolt Hole Cracks
(h) If any crack is found in a bolt hole during any inspection required by this AD, and Boeing
Alert Service Bulletin 747-53A2610, dated May 10, 2007, specifies to contact Boeing for appropriate
action: Before further flight, repair the crack using a method approved in accordance with the
procedures specified in paragraph (j) of this AD.
Optional Terminating Action
(i) Except as provided by paragraph (h) of this AD, accomplishing the applicable repairs or
modifications at all tension tie locations, in accordance with Part 3 of the Accomplishment
Instructions of Boeing Alert Service Bulletin 747-53A2610, dated May 10, 2007, terminates the
repetitive inspections required by paragraph (f) of this AD.
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) To request a different method of compliance or a different compliance time for this AD,
follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which
the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards
District Office (FSDO), or lacking a PI, your local FSDO.
(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, and the approval must specifically refer to this AD.
Material Incorporated by Reference
(k) You must use Boeing Alert Service Bulletin 747-53A2610, dated May 10, 2007, to perform
the actions that are required by this AD, unless the AD specifies otherwise. The Director of the
Federal Register approved the incorporation by reference of this document in accordance with 5
U.S.C. 552(a) and 1 CFR part 51. Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle,
Washington 98124-2207, for a copy of this service information. You may review copies at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National
Archives and Records Administration (NARA). For information on the availability of this material at
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.
Issued in Renton, Washington, on August 2, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. E7-15582 Filed 8-10-07; 8:45 am] SU
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