Airworthiness Directive MD80s

This directive affects almost 300 AA jets and 100 Delta jets. The carriers have announced their intention to comply within the two year time frame for mandated repairs.

[Federal Register: July 8, 2008 (Volume 73, Number 131)]
[Rules and Regulations]
[Page 38883-38885]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr08jy08-1]


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[[Page 38883]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-29335; Directorate Identifier 2007-NM-045-AD;
Amendment 39-15592; AD 2008-13-29]
RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Model DC-9-81 (MD-
81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for all
McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-
83), DC-9-87 (MD-87), and MD-88 airplanes. This AD requires repetitive
inspections for cracking of the overwing frames from stations 845 to
905 (MD-87 stations 731 to 791), left and right sides, and corrective
actions if necessary. This AD results from reports of cracked overwing
frames. We are issuing this AD to detect and correct such cracking,
which could sever the frame, increase the loading of adjacent frames,
and result in damage to adjacent structure and loss of overall
structural integrity of the airplane.

DATES: This AD is effective August 12, 2008.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 12,
2008.

ADDRESSES: For service information identified in this AD, contact
Boeing Commercial Airplanes, Long Beach Division, 3855 Lakewood
Boulevard, Long Beach, California 90846, Attention: Data and Service
Management, Dept. C1-L5A (D800-0024).

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 AD, the regulatory evaluation,
any comments received, and other information. The address for the
Docket Office (telephone 800-647-5527) is the Document Management
Facility, U.S. Department of Transportation, Docket Operations, M-30,
West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE.,
Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Roger Durbin, Aerospace Engineer,
Airframe Branch, ANM-120L, FAA, Los Angeles Aircraft Certification
Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137;
telephone (562) 627-5233; fax (562) 627-5210.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 to include an airworthiness directive (AD) that would apply to
all McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83
(MD-83), DC-9-87 (MD-87), and MD-88 airplanes. That NPRM was published
in the Federal Register on September 28, 2007 (72 FR 55111). That NPRM
proposed to require repetitive inspections for cracking of the overwing
frames from stations 845 to 905 (MD-87 stations 731 to 791), left and
right sides, and corrective actions if necessary.

Comments

We gave the public the opportunity to participate in developing
this AD. We considered the comments received.

Request To Extend Compliance Time

Air Transport Association (ATA), on behalf of its member American
Airlines, states that a 24-month compliance period for the initial
inspections would be overly burdensome. The commenters request that we
extend the compliance time to 48 months so operators can integrate the
required actions with planned heavy maintenance visits. The commenters
add that we did not consider the size of the fleet and the availability
of parts when we determined the compliance period. American Airlines
finds that a longer compliance time can be justified by applying
statistically based risk analysis methods and accounting for the effect
of flight cycles.
We do not agree to extend the compliance time. We have no data or
analysis to support such an extension of the compliance period. For
airplanes that have accumulated more than 20,000 total flight cycles,
the extent of damage already accumulated on the affected fuselage
frames cannot be predetermined, so accounting for subsequent flight
cycles will provide no benefit. The 24-month compliance period is
considered appropriate in light of the characteristics of crack growth,
the probability of crack initiation, and the ability of operators to
integrate the required actions into established maintenance practices.
Currently there are insufficient statistical or other data to justify a
compliance period beyond the proposed 24 months. However, paragraph (h)
of this final rule provides operators the opportunity to request an
extension of the compliance time if data are presented to justify such
an extension. We have not changed the final rule regarding this issue.

Request To Delay Issuance of AD Pending Parts Availability

ATA, on behalf of its member American Airlines, notes that the rate
of cracking noted in early inspections suggests that the supply of
available spare parts is insufficient to support completion of the
proposed actions within the 24-month compliance period. Delta Air Lines
also expresses concern over the availability of spare frames and
reports that all its repairs done to date have been done by frame
replacement with a like part.
We infer that the commenters request that we wait to issue the
final rule until sufficient parts are available. We disagree with the
need to delay the final rule. Boeing has arranged to have additional
frames manufactured as demand builds during the 24-month compliance
period. Boeing expects a sufficient supply to be available to support
the AD requirements. We are proceeding with issuance of the final rule
as proposed.

[[Page 38884]]

Request To Revise Cost Estimate

ATA, on behalf of its member Delta Air Lines, notes that the
estimated work hours to do the required actions assume that access to
the overwing frames is available during a scheduled maintenance visit.
The commenters assert that the 4-hour labor estimate applies only when
the inspection can be done during a scheduled heavy maintenance visit,
when the airplane is already opened up. Delta states that, in reality,
up to 67 percent of its fleet will not be due for the heavy maintenance
visit during the proposed compliance time. That portion of the fleet
will require special-schedule inspection visits, and add at least 16
work hours to gain access to the inspection areas.
We infer that the commenters are requesting that we revise the cost
estimate provided in the NPRM. We do not agree. The cost information
provided in AD actions describes only the direct costs of the specific
requirements. Based on the best data available, the manufacturer
provided the number of work hours to do the required actions for this
AD. We recognize that, in doing the actions required by an AD,
operators might incur incidental costs, such as the time necessary for
access and close, in addition to the direct costs. These incidental
costs can vary significantly among operators. We have not changed the
final rule regarding this issue.

Conclusion

We reviewed the relevant data, considered the comments received,
and determined that air safety and the public interest require adopting
the AD as proposed.

Interim Action

We consider this AD interim action. The manufacturer is currently
developing a modification that will address the unsafe condition
identified in this AD. Once this modification is developed, approved,
and available, we may consider additional rulemaking.

Costs of Compliance

There are about 1,189 airplanes of the affected design in the
worldwide fleet. The following table provides the estimated costs for
U.S. operators to comply with this AD.

Estimated Costs
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Number of U.S.-
Work hours Average labor Parts Cost per airplane registered Fleet cost
rate per hour airplanes
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
4.................................. $80 None................. $320, per inspection cycle....................... 670 $214,400, 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

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 this AD:
(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.
You can find our regulatory evaluation and the estimated costs of
compliance in the AD Docket.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator,
the FAA amends 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. The FAA amends Sec. 39.13 by adding the following new AD:

2008-13-29 McDonnell Douglas: Amendment 39-15592. Docket No. FAA-
2007-29335; Directorate Identifier 2007-NM-045-AD.

Effective Date

(a) This airworthiness directive (AD) is effective August 12,
2008.

Affected ADs

(b) None.

Applicability

(c) This AD applies to all McDonnell Douglas Model DC-9-81 (MD-
81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88
airplanes, certificated in any category.

Unsafe Condition

(d) This AD results from reports of cracked overwing frames. We
are issuing this AD to detect and correct such cracking, which could
sever the frame, increase the loading of adjacent frames, and result
in damage to adjacent structure and loss of overall structural
integrity 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.

Inspections

(f) Before the accumulation of 20,000 total flight cycles, or
within 24 months after the effective date of this AD, whichever
occurs later: Do general visual and high frequency eddy current
inspections, and all applicable corrective actions, in accordance
with the Accomplishment Instructions of Boeing Alert Service
Bulletin MD80-53A301, Revision 1, dated May 25, 2007. Do the
applicable

[[Page 38885]]

corrective actions before further flight after accomplishing the
inspections. Repeat the inspections thereafter at applicable
intervals not to exceed those specified in paragraph 1.E.,
``Compliance,'' of the service bulletin.

Actions According to Previous Issue of Service Bulletin

(g) Inspections and related investigative and corrective actions
are also acceptable for compliance with the requirements of
paragraph (f) of this AD if done before the effective date of this
AD in accordance with Boeing Alert Service Bulletin MD80-53A301,
dated January 9, 2007.

Alternative Methods of Compliance (AMOCs)

(h)(1) The Manager, Los Angeles 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, Los Angeles ACO, to make those findings. For a
repair method to be approved, the repair must meet the certification
basis of the airplane and 14 CFR 25.571, Amendment 45, and the
approval must specifically refer to this AD.

Material Incorporated by Reference

(i) You must use Boeing Alert Service Bulletin MD80-53A301,
Revision 1, dated May 25, 2007, to do the actions required by this
AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register approved the
incorporation by reference of this service information under 5
U.S.C. 552(a) and 1 CFR part 51.
(2) For service information identified in this AD, contact
Boeing Commercial Airplanes, Long Beach Division, 3855 Lakewood
Boulevard, Long Beach, California 90846, Attention: Data and Service
Management, Dept. C1-L5A (D800-0024).
(3) You may review copies of the service information
incorporated by reference 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.

Issued in Renton, Washington, on June 8, 2008.
Michael Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E8-14472 Filed 7-7-08; 8:45 am]

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