[Federal Register: June 29, 2004 (Volume 69, Number 124)]
[Rules and Regulations]
[Page 38824-38826]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr29jn04-10]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 2003-NM-126-AD; Amendment 39-13697; AD 2004-13-15]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 747-400 and -400D Series
Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to certain Boeing Model 747-400 and -400D series airplanes,
that requires an inspection to detect missing fasteners in the section
42 skin and internal doubler at the cutout for the ground exhaust valve
of the electrical equipment; modification and rework of the doubler;
repetitive inspections of the skin for cracks; and corrective actions
if necessary; as applicable. This action is necessary to detect and
correct fatigue cracks in the section 42 skin at the cutout for the
ground exhaust valve of the electrical equipment, which could result in
rapid decompression of the airplane. This action is intended to address
the identified unsafe condition.
DATES: Effective August 3, 2004.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of August 3, 2004.
ADDRESSES: The service information referenced in this AD may be
obtained from Boeing Commercial Airplanes, P.O. Box 3707, Seattle,
Washington 98124-2207. This information may be examined at the Federal
Aviation
[[Page 38825]]
Administration (FAA), Transport Airplane Directorate, Rules Docket,
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/code_of_federal_regulations/ibr_locations.html
.
FOR FURTHER INFORMATION CONTACT: Candice Gerretsen, Aerospace Engineer,
Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office,
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425)
917-6428; fax (425) 917-6590.
SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal
Aviation Regulations (14 CFR part 39) to include an airworthiness
directive (AD) that is applicable to certain Boeing Model 747-400 and -
400D series airplanes was published in the Federal Register on April 1,
2004 (69 FR 17073). That action proposed to require an inspection to
detect missing fasteners in the section 42 skin and internal doubler at
the cutout for the ground exhaust valve of the electrical equipment;
modification and rework of the doubler; repetitive inspections of the
skin for cracks; and corrective actions if necessary; as applicable.
Comments
Interested persons have been afforded an opportunity to participate
in the making of this amendment. No comments were submitted in response
to the proposal or the FAA's determination of the cost to the public.
Conclusion
The FAA has determined that air safety and the public interest
require the adoption of the rule as proposed.
Cost Impact
There are approximately 142 airplanes of the affected design in the
worldwide fleet. The FAA estimates that 22 airplanes of U.S. registry
will be affected by this AD.
For Group 1 airplanes listed in Boeing Alert Service Bulletin 747-
53A2340, it will take approximately 1 work hour per airplane to
accomplish the required inspection (part 1), at an average labor rate
of $65 per work hour. Based on these figures, the cost impact of this
inspection required by this AD on U.S. operators is estimated to be $65
per airplane.
For Groups 1 and 2 airplanes listed in Boeing Alert Service
Bulletin 747-53A2340, it will take approximately 40 work hours per
airplane to accomplish the required modification and rework (part 2),
at an average labor rate of $65 per work hour. Based on these figures,
the cost impact of this modification and rework required by this AD on
U.S. operators is estimated to be $2,600 per airplane.
For Groups 1 through 4 airplanes listed in Boeing Alert Service
Bulletin 747-53A2340, it will take approximately 1 work hours per
airplane to accomplish the required inspection (part 3), at an average
labor rate of $65 per work hour. Based on these figures, the cost
impact of this inspection required by this AD on U.S. operators is
estimated to be $65 per airplane, per inspection cycle.
The cost impact figure discussed above is based on assumptions that
no operator has yet accomplished any of the requirements of this AD
action, and that no operator would accomplish those actions in the
future if this AD were not adopted. The cost impact figures discussed
in AD rulemaking actions represent only the time necessary to perform
the specific actions actually required by the AD. These figures
typically do not include incidental costs, such as the time required to
gain access and close up, planning time, or time necessitated by other
administrative actions.
Regulatory Impact
The regulations adopted herein 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. Therefore, it
is determined that this final rule does not have federalism
implications under Executive Order 13132.
For the reasons discussed above, I certify that this action (1) is
not a ``significant regulatory action'' under Executive Order 12866;
(2) is not a ``significant rule'' under 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. A final evaluation has been prepared for this action
and it is contained in the Rules Docket. A copy of it may be obtained
from the Rules Docket at the location provided under the caption
ADDRESSES.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
0
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration amends part 39 of
the Federal Aviation Regulations (14 CFR part 39) as follows:
PART 39--AIRWORTHINESS DIRECTIVES
0
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]
0
2. Section 39.13 is amended by adding the following new airworthiness
directive:
2004-13-15 Boeing: Amendment 39-13697. Docket 2003-NM-126-AD.
Applicability: Model 747-400 and 400D series airplanes, as
listed in paragraph 1.A., ``Effectivity,'' of Boeing Alert Service
Bulletin 747-53A2340, Revision 2, dated April 24, 2003; certificated
in any category.
Compliance: Required as indicated, unless accomplished
previously.
To detect and correct fatigue cracks in the section 42 skin at
the cutout for the ground exhaust valve of the electrical equipment,
which could result in rapid decompression of the airplane,
accomplish the following:
Part 1--Fastener Inspection and Corrective Actions if Necessary
(a) For Group 1 airplanes listed in Boeing Alert Service
Bulletin 747-53A2340, Revision 2, dated April 24, 2003: Within 250
flight cycles or 4 months after the effective date of this AD,
whichever occurs later, do a general visual inspection to detect
missing fasteners in the section 42 skin and internal doubler at the
cutout for the ground exhaust valve of the electrical equipment, per
part 1 of the Accomplishment Instructions of the service bulletin.
(1) If all fasteners are installed, do the actions specified in
paragraph (b) of this AD at the indicated time.
(2) If any fastener is missing, before further flight,
accomplish all applicable corrective actions (i.e., performing an
open hole high frequency (HFEC) inspection for cracks and any
applicable repair, oversizing and drilling of holes, and
installation of fasteners), in accordance with part 1 of the
Accomplishment Instructions of the service bulletin, except as
required by paragraph (f) of this AD.
Part 2--Modification and Rework
(b) For Group 1 and Group 2 airplanes listed in Boeing Alert
Service Bulletin 747-53A2340, Revision 2, dated April 24, 2003:
Before the accumulation of 6,000 total flight cycles, or within
1,500 flight cycles or 24 months after the effective date of this
AD, whichever occurs later, modify and rework the internal doubler
(i.e., performing an open hole HFEC inspection for cracks and any
applicable repair, oversizing and drilling of holes, and
installation of fasteners) by accomplishing all actions specified in
part 2
[[Page 38826]]
of the Accomplishment Instructions of the service bulletin. Do the
actions per the service bulletin, except as required by paragraph
(f) of this AD. Any applicable repair must be accomplished before
further flight.
Part 3--Repetitive Inspections and Repair if Necessary
(c) At the applicable time specified in paragraph (c)(1) or
(c)(2) of this AD, do an external HFEC inspection of the skin for
cracks per part 3 of the Accomplishment Instructions of Boeing Alert
Service Bulletin 747-53A2340, Revision 2, dated April 24, 2003.
(1) For Group 1 and Group 2 airplanes listed in the service
bulletin: Within 10,000 flight cycles after accomplishing the
actions required by paragraph (b) of this AD, or within 1,500 flight
cycles or 24 months after the effective date of this AD, whichever
occurs later.
(2) For Group 3 and Group 4 airplanes listed in the service
bulletin: Before the accumulation of 15,000 total flight cycles, or
within 1,500 flight cycles or 24 months after the effective date of
this AD, whichever occurs later.
(d) If no crack is detected during the external HFEC inspection
required by paragraph (c) of this AD, repeat the external HFEC
inspection thereafter at intervals not to exceed 5,000 flight
cycles.
(e) If any crack is detected during the external HFEC inspection
required by paragraph (c) of this AD, before further flight, repair
per part 3 of the Accomplishment Instructions of Boeing Alert
Service Bulletin 747-53A2340, Revision 2, dated April 24, 2003,
except as required by paragraph (f) of this AD. Repeat the external
HFEC inspection in the unrepaired areas thereafter at intervals not
to exceed 5,000 flight cycles.
Exception to Service Bulletin Actions
(f) If any discrepancy is found during any inspection required
by this AD, and the bulletin specifies to contact Boeing for an
alternate repair: Before further flight, repair per a method
approved by the Manager, Seattle Aircraft Certification Office
(ACO), FAA; or per data meeting the type certification basis of the
airplane approved by a Boeing Company Designated Engineering
Representative who has been authorized by the Manager, Seattle ACO,
to make such findings. For a repair method to be approved, the
approval must specifically reference this AD.
Credit for Previous Revisions of Service Bulletins
(g) Actions accomplished before the effective date of this AD
per Boeing Alert Service Bulletin 747-53A2340, original issue, dated
August 1, 1991; or Revision 1, dated October 31, 1991, are
acceptable for compliance with the requirements of this AD.
Alternative Methods of Compliance
(h)(1) In accordance with 14 CFR 39.19, the Manager, Seattle
ACO, FAA, is authorized to approve alternative methods of compliance
(AMOCs) for this AD.
(2) An AMOC that provides an acceptable level of safety may be
used for any inspection or repair required by this AD, if it is
approved by a Boeing Company Designated Engineering Representative
who has been authorized by the Manager, Seattle ACO, to make such
findings. For an inspection or repair method to be approved, the
approval must specifically reference this AD.
Incorporation by Reference
(i) Unless otherwise specified in this AD, the actions shall be
done in accordance with Boeing Alert Service Bulletin 747-53A2340,
Revision 2, dated April 24, 2003. This incorporation by reference
was approved by the Director of the Federal Register in accordance
with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from
Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington
98124-2207. Copies may be inspected 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/code_of_federal_regulations/ibr_locations.html
.
Effective Date
(j) This amendment becomes effective on August 3, 2004.
Issued in Renton, Washington, on June 17, 2004.
Ali Bahrami,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 04-14568 Filed 6-28-04; 8:45 am]
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