[Federal Register Volume 76, Number 28 (Thursday, February 10, 2011)]
[Proposed Rules]
[Pages 7513-7515]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2011-2952]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2011-0041; Directorate Identifier 2010-NM-227-AD]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Model 747-400 and -
400F Series Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: We propose to adopt a new airworthiness directive (AD) for the
products listed above. This proposed AD would require a general visual
inspection for cracks and holes of the main equipment center (MEC) drip
shields, and repairs if necessary; installation of a fiberglass
reinforcing overcoat; and, for certain airplanes, installation of
stiffening panels to the MEC drip shields. This proposed AD was
prompted by a report of a loss of bus control unit number 1 and
generator control units numbers 1 and 2 while the airplane was on the
ground, and multiple operator reports of cracked MEC drip shields. We
are proposing this AD to prevent water penetration into the MEC, which
could result in the loss of flight critical systems.
DATES: We must receive comments on this proposed AD by March 28, 2011.
ADDRESSES: You may send comments by any of the following methods:
Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202-493-2251.
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.
Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this proposed AD, contact
Boeing Commercial Airplanes, Attention: Data & Services Management,
P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207; telephone 206-
544-5000, extension 1; fax 206-766-5680; e-mail [email protected];
Internet https://www.myboeingfleet.com. You may review copies of the
referenced service information at the FAA, Transport Airplane
Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information
on the availability of this material at the FAA, call 425-227-1221.
Examining the AD Docket
You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Management Facility
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The AD docket contains this proposed AD, the regulatory
evaluation, any comments received, and other information. The street
address for the Docket Office (phone: 800-647-5527) is in the ADDRESSES
section. Comments will be available in the AD docket shortly after
receipt.
FOR FURTHER INFORMATION CONTACT: Marcia Smith, Aerospace Engineer,
Cabin Safety & Environmental Systems Branch, ANM-150S, FAA, Seattle
Aircraft Certification Office (ACO), 1601 Lind Avenue, SW., Renton,
Washington 98057-3356; phone: 425-917-6484; fax: 425-917-6590; e-mail:
[email protected].
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include ``Docket No. FAA-2011-0041;
Directorate Identifier 2010-NM-227-AD'' at the beginning of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of this proposed AD. We
will consider all comments received by the closing date and may amend
this proposed AD because of those comments.
We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive about this proposed AD.
Discussion
We have received a report of a loss of bus control unit number 1
and generator control units numbers 1 and 2 while the airplane was on
the ground, and multiple operators have reported cracked main equipment
center (MEC) drip shields. Cracking in the MEC drip shield and exhaust
plenum has been identified as part of the water leak path into the MEC.
This condition, if not corrected, could result in water penetration
into the MEC, which could result in the loss of flight critical
systems.
Relevant Service Information
We reviewed Boeing Alert Service Bulletin 747-25A3588, dated July
19, 2010. The service information describes procedures for performing a
general visual inspection of the MEC drip shield for cracks and holes,
performing repairs if necessary, and installing a fiberglass
reinforcing overcoat to the MEC drip shield. Additionally, for
airplanes identified as Groups 1 and 3, the service information
describes procedures for installing MEC drip shield panel stiffeners.
FAA's Determination
We are proposing this AD because we evaluated all the relevant
information and determined the unsafe condition described previously is
likely to exist or
[[Page 7514]]
develop in other products of the same type design.
Proposed AD Requirements
This proposed AD would require accomplishing the actions specified
in the service information described previously.
Costs of Compliance
We estimate that this proposed AD affects 41 airplanes of U.S.
registry.
We estimate the following costs to comply with this proposed AD:
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Inspection and installation: 20 work-hours x $85 per $1,109............. $2,809 $67,416
Groups 1, 3 (24 airplanes). hour = $1,700.
Inspection and installation: 17 work-hours x $85 per Negligible......... 1,445 24,565
Group 2 (17 airplanes). hour = $1,445.
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We estimate the following costs to do any necessary repairs that
would be required based on the results of the proposed inspection. We
have no way of determining the number of aircraft that might need these
repairs.
On-Condition Costs
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Action Labor cost Parts cost Cost per airplane
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Hole repair..................... 1 work-hour x $85 per Negligible......... $85 per hole.
hour = $85 per hole.
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According to the manufacturer, some of the costs of this proposed
AD may be covered under warranty, thereby reducing the cost impact on
affected individuals. We do not control warranty coverage for affected
individuals. As a result, we have included all costs in our cost
estimate.
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 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 this 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),
(3) Will not affect intrastate aviation in Alaska, and
(4) 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.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, 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 FAA amends Sec. 39.13 by adding the following new
airworthiness directive (AD):
The Boeing Company: Docket No. FAA-2011-0041; Directorate Identifier
2010-NM-227-AD.
Comments Due Date
(a) We must receive comments by March 28, 2011.
Affected ADs
(b) None.
Applicability
(c) This AD applies to The Boeing Company Model 747-400 and -
400F series airplanes, certificated in any category, as identified
in Boeing Alert Service Bulletin 747-25A3588, dated July 19, 2010.
Subject
(d) Joint Aircraft System Component (JASC)/Air Transport
Association (ATA) of America Code 25, Equipment/Furnishings.
Unsafe Condition
(e) This AD was prompted by a report of a loss of bus control
unit number 1 and generator control units numbers 1 and 2 while the
airplane was on the ground, and multiple operator reports of cracked
main equipment center (MEC) drip shields. We are issuing this AD to
prevent water penetration into the MEC, which could result in the
loss of flight critical systems.
Compliance
(f) Comply with this AD within the compliance times specified,
unless already done.
Inspection
(g) Within 24 months after the effective date of this AD, do the
actions specified in paragraph (g)(1) or (g)(2) of this AD, as
applicable, in accordance with the Accomplishment Instructions of
Boeing Alert Service Bulletin 747-25A3588, dated July 19, 2010.
(1) For Group 1 and Group 3 airplanes, as identified in Boeing
Alert Service Bulletin 747-25A3588, dated July 19, 2010: Do a
general visual inspection of the MEC drip
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shield to detect cracking and holes; do all applicable repairs; and
install the MEC drip shield panel stiffeners and the fiberglass
reinforcing overcoat to the MEC drip shield; in accordance with the
Accomplishment Instructions of Boeing Alert Service Bulletin 747-
25A3588, dated July 19, 2010. Do all applicable repairs before
further flight.
(2) For Group 2 airplanes, as identified in Boeing Alert Service
Bulletin 747-25A3588, dated July 19, 2010: Do a general visual
inspection of the MEC drip shield to detect cracking and holes; do
all applicable repairs; and install the fiberglass reinforcing
overcoat to the MEC drip shield; in accordance with the
Accomplishment Instructions of Boeing Alert Service Bulletin 747-
25A3588, dated July 19, 2010. Do all applicable repairs before
further flight.
Alternative Methods of Compliance (AMOCs)
(h)(1) The Manager, Seattle Aircraft Certification Office (ACO),
FAA, has the authority to approve AMOCs for this AD, if requested
using the procedures found in 14 CFR 39.19. In accordance with 14
CFR 39.19, send your request to your principal inspector or local
Flight Standards District Office, as appropriate. If sending
information directly to the manager of the ACO, send it to the
attention of the person identified in the Related Information
section of this AD. Information may be e-mailed to: [email protected].
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the local flight standards district office/certificate holding
district office.
Related Information
(i) For more information about this AD, contact Marcia Smith,
Aerospace Engineer, Cabin Safety & Environmental Systems Branch,
ANM-150S FAA, Seattle Aircraft Certification Office (ACO), 1601 Lind
Avenue, SW., Renton, Washington 98057-3356; phone: 425-917-6484;
fax: 425-917-6590; e-mail: [email protected].
(j) For service information identified in this AD, contact
Boeing Commercial Airplanes, Attention: Data & Services Management,
P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207; telephone
206-544-5000, extension 1; fax 206-766-5680; e-mail
[email protected]; Internet https://www.myboeingfleet.com. You
may review copies of the referenced service information at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington. For information on the availability of this material at
the FAA, call 425-227-1221.
Issued in Renton, Washington, on February 3, 2011.
Ali Bahrami,
Manager,Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. 2011-2952 Filed 2-9-11; 8:45 am]
BILLING CODE 4910-13-P