[Federal Register Volume 82, Number 117 (Tuesday, June 20, 2017)]
[Proposed Rules]
[Pages 28030-28033]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-12613]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0560; Directorate Identifier 2016-NM-172-AD]
RIN 2120-AA64


Airworthiness Directives; Airbus Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all 
Airbus Model A310-203, -204, -221, -222, -304, -322, -324, and -325 
airplanes. This proposed AD was prompted by reports of cracking in the 
drainage holes on the lower skin panel in the center wing box between 
frames (FR) 42 and FR 46. This proposed AD would require repetitive 
rotating probe inspections for cracking of the trellis boom drainage 
holes, the holes in the stringers bottom, and the holes of the inner 
pump, and corrective actions if necessary. We are proposing this AD to 
address the unsafe condition on these products.

DATES: We must receive comments on this proposed AD by August 4, 2017.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, 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

[[Page 28031]]

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 NPRM, contact Airbus 
SAS, Airworthiness Office--EAW, 1 Rond Point Maurice Bellonte, 31707 
Blagnac Cedex, France; telephone: +33 5 61 93 36 96; fax: +33 5 61 93 
44 51; email: [email protected]; Internet: http://www.airbus.com. You may view this referenced service information at the 
FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. 
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 by searching for and locating Docket No. FAA-2017-
0560; 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 
Operations office (telephone: 800-647-5527) is in the ADDRESSES 
section. Comments will be available in the AD docket shortly after 
receipt.

FOR FURTHER INFORMATION CONTACT: Dan Rodina, Aerospace Engineer, 
International Branch, ANM-116, Transport Airplane Directorate, FAA, 
1601 Lind Avenue SW., Renton, WA 98057-3356; telephone: 425-227-2125; 
fax: 425-227-1149.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2017-0560; 
Directorate Identifier 2016-NM-172-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 based on 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

    Fatigue damage can occur locally, in small areas or structural 
design details, or globally, in widespread areas. Multiple-site damage 
is widespread damage that occurs in a large structural element such as 
a single rivet line of a lap splice joining two large skin panels. 
Widespread damage can also occur in multiple elements such as adjacent 
frames or stringers. Multiple-site damage and multiple-element damage 
cracks are typically too small initially to be reliably detected with 
normal inspection methods. Without intervention, these cracks will 
grow, and eventually compromise the structural integrity of the 
airplane. This condition is known as widespread fatigue damage (WFD). 
It is associated with general degradation of large areas of structure 
with similar structural details and stress levels. As an airplane ages, 
WFD will likely occur, and will certainly occur if the airplane is 
operated long enough without any intervention.
    The FAA's WFD final rule (75 FR 69746, November 15, 2010) became 
effective on January 14, 2011. The WFD rule requires certain actions to 
prevent structural failure due to WFD throughout the operational life 
of certain existing transport category airplanes and all of these 
airplanes that will be certificated in the future. For existing and 
future airplanes subject to the WFD rule, the rule requires that DAHs 
establish a limit of validity (LOV) of the engineering data that 
support the structural maintenance program. Operators affected by the 
WFD rule may not fly an airplane beyond its LOV, unless an extended LOV 
is approved.
    The WFD rule (75 FR 69746, November 15, 2010) does not require 
identifying and developing maintenance actions if the DAHs can show 
that such actions are not necessary to prevent WFD before the airplane 
reaches the LOV. Many LOVs, however, do depend on accomplishment of 
future maintenance actions. As stated in the WFD rule, any maintenance 
actions necessary to reach the LOV will be mandated by airworthiness 
directives through separate rulemaking actions.
    In the context of WFD, this action is necessary to enable DAHs to 
propose LOVs that allow operators the longest operational lives for 
their airplanes, and still ensure that WFD will not occur. This 
approach allows for an implementation strategy that provides 
flexibility to DAHs in determining the timing of service information 
development (with FAA approval), while providing operators with 
certainty regarding the LOV applicable to their airplanes.
    On April 22, 2011, we issued AD 2011-10-06, Amendment 39-16687 (76 
FR 27227, May 11, 2011) (``AD 2011-10-06''), applicable to all Airbus 
Model A310-203, -204, -221, -222, -304, -322, -324, and -325 airplanes. 
That AD currently requires:
     Cold working of trellis boom drainage holes;
     Repetitive detailed or rotating probe inspections for 
cracking in the drainage holes on the lower skin panel in the center 
wing box between FR 42 and FR 46, and corrective actions if necessary, 
including repair; and
     Repetitive eddy current inspections for cracking of the 
upper corner angle fitting and the vertical tee fitting at left and 
right FR 40, and corrective actions if necessary, including repair and 
replacement of the internal angle fitting.
    AD 2011-10-06 was prompted by European Aviation Safety Agency 
(EASA), which is the Technical Agent for the Member States of the 
European Union, AD 2009-0057 to identify and correct an unsafe 
condition. The identified unsafe condition is cracking of trellis boom 
drainage holes, the holes in the stringers bottom, and the holes of the 
inner pump, which could result in reduced structural integrity of the 
wings.
    Since issuance of AD 2011-10-06, EASA has issued EASA AD 2016-0196, 
dated September 30, 2016 (referred to after this as the Mandatory 
Continuing Airworthiness Information, or ``the MCAI''), to correct an 
unsafe condition for all Airbus Model A310-203, -204, -221, -222, -304, 
-322, -324, and -325 airplanes. The MCAI states:

    DGAC France issued AD F-1992-106-132R7 to require certain 
inspections and modifications which addressed JAR/FAR [Joint 
Aviation Requirements/Federal Aviation Regulations] 25-571 
requirements, related to damage-tolerance and fatigue evaluation of 
structure. Following the Extended Design Service Goal activities as 
part of the Structure Task Group for the Airbus A310 program, EASA 
published AD 2007-0053, which replaced DGAC France AD F-1992-106-
132R7.
    After EASA issued AD 2007-0053R1, the thresholds and the 
intervals of Airbus Service Bulletins (SB) A310-57-2050 and A310-57-
2064 were updated, prompting EASA to issue AD 2009-0057 [which 
corresponds to FAA AD 2011-10-06] and [EASA] AD 2007-0053 was 
revised (R2) accordingly. EASA AD 2009-0057 also required the 
accomplishment of the actions specified in Airbus SB A310-57-2048 at 
Revision 01.
    After EASA issued AD 2009-0057, in the frame of the Widespread 
Fatigue Damage campaign, new analysis has indicated the need for 
additional work included in Revision 03 of Airbus SB A310-57-2050.

[[Page 28032]]

    For the reason described above, this new [EASA] AD retains the 
requirements of EASA AD 2009-0057, which is superseded, and requires 
inspection and corrective actions as specified in Airbus SB A310-57-
2050 Revision 04.

    Required actions include a repetitive rotating probe inspection for 
cracking of certain holes in the stringers bottom, inner pumps, and the 
trellis boom; and corrective actions, i.e., repair of holes where 
cracks are discovered.
    The compliance times vary depending on airplane configuration. The 
earliest initial inspection compliance time is 11,400 total flight 
cycles or 57,300 total flight hours, whichever occurs first. The latest 
initial compliance time is 38,700 total flight cycles or 77,500 total 
flight hours, whichever occurs first. The shortest repetitive interval 
is 6,200 flight cycles or 31,200 flight hours, whichever occurs first.
    You may examine the MCAI in the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-
0560.

Related Service Information Under 1 CFR Part 51

    We reviewed Airbus Service Bulletin A310-57-2050, Revision 04, 
dated March 13, 2015. This service information describes procedures for 
repetitive rotating probe inspections for cracking of the trellis boom 
drainage holes, the holes in the stringers bottom, and the holes of the 
inner pump, and corrective actions. This service information is 
reasonably available because the interested parties have access to it 
through their normal course of business or by the means identified in 
the ADDRESSES section.

FAA's Determination and Requirements of This Proposed AD

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to our bilateral agreement with the State of Design Authority, we have 
been notified of the unsafe condition described in the MCAI and service 
information referenced above. We are proposing this AD because we 
evaluated all pertinent information and determined an unsafe condition 
exists and is likely to exist or develop on other products the same 
type design.
    This proposed AD would not supersede AD 2011-10-06. Rather, we have 
determined that a stand-alone AD would be more appropriate to address 
the changes in the MCAI. This proposed AD would require repetitive 
rotating probe inspections for cracking of the trellis boom drainage 
holes, the holes in the stringers bottom, and the holes of the inner 
pump, and corrective actions, if necessary. Accomplishment of the 
proposed actions would then terminate the actions required by paragraph 
(h) of AD 2011-10-06.

Costs of Compliance

    We estimate that this proposed AD affects 8 airplanes of U.S. 
registry.
    We estimate the following costs to comply with this proposed AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
              Action                         Labor cost             Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Inspection........................  84 work-hours x $85 per hour          $5,890         $13,030        $104,240
                                     = $7,140.
----------------------------------------------------------------------------------------------------------------

    We have received no definitive data that would enable us to provide 
cost estimates for the on-condition actions specified in this proposed 
AD.

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

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 airworthiness 
directive (AD):

Airbus: Docket No. FAA-2017-0560; Directorate Identifier 2016-NM-
172-AD.

(a) Comments Due Date

    We must receive comments by August 4, 2017.

(b) Affected ADs

    This AD affects AD 2011-10-06, Amendment 39-16687 (76 FR 27227, 
May 11, 2011) (``AD 2011-10-06'').

(c) Applicability

    This AD applies to Airbus Model A310-203, -204, -221, -222, -
304, -322, -324, and -325 airplanes, certificated in any category, 
all serial numbers.

(d) Subject

    Air Transport Association (ATA) of America Code 57, Wings.

[[Page 28033]]

(e) Reason

    This AD was prompted by reports of cracking in the drainage 
holes on the lower skin panel in the center wing box between frames 
(FR) 42 and FR 46. We are issuing this AD to detect and correct 
cracking of trellis boom drainage holes, the holes in the stringers 
bottom, and the holes of the inner pump, which could result in 
reduced structural integrity of the wings.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Rotating Probe Inspections and Corrective Actions

    Except as provided by paragraph (h)(1) of this AD, before 
exceeding the applicable threshold or grace period, whichever occurs 
later, as defined in paragraph 1.E., ``Compliance,'' of Airbus 
Service Bulletin A310-57-2050, Revision 04, dated March 13, 2015, 
accomplish the rotating probe inspection for cracking of the trellis 
boom drainage holes, the holes in the stringers bottom, and the 
holes of the inner pump, as applicable, and do all applicable 
corrective actions, as specified in, and in accordance with the 
Accomplishment Instructions of Airbus Service Bulletin A310-57-2050, 
Revision 04, dated March 13, 2015, except as required by paragraph 
(h)(2) of this AD. Do all applicable corrective actions before 
further flight. Repeat the inspection thereafter at intervals not to 
exceed those defined in paragraph 1.E., ``Compliance,'' of Airbus 
Service Bulletin A310-57-2050, Revision 04, dated March 13, 2015.

(h) Exceptions to Service Information

    (1) Where Airbus Service Bulletin A310-57-2050, Revision 04, 
dated March 13, 2015, specifies a grace period ``after receipt of 
the Service Bulletin without exceeding previous Service Bulletin 
revision values,'' this AD requires compliance within the specified 
grace period after the effective date of this AD.
    (2) Where Airbus Service Bulletin A310-57-2050, Revision 04, 
dated March 13, 2015, specifies to contact Airbus for appropriate 
action, and specifies that action as ``RC'' (Required for 
Compliance): Before further flight, accomplish corrective actions in 
accordance with the procedures specified in paragraph (l)(2) of this 
AD.

(i) No Terminating Action for Inspections

    Accomplishing corrective actions on an airplane as required by 
paragraph (g) or (h)(2) of this AD does not constitute terminating 
action for the repetitive actions required by paragraph (g) of this 
AD.

(j) Terminating Action

    Accomplishment of the initial inspection required by paragraph 
(g) of this AD constitutes terminating action for the actions 
required by paragraph (h) of AD 2011-10-06.

(k) Credit for Previous Actions

    This paragraph provides credit for actions required by paragraph 
(g) of this AD, if those actions were performed before the effective 
date of this AD using the service information specified in Airbus 
Service Bulletin A310-57-2050, Revision 03, dated December 19, 2014.

(l) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
International Branch, ANM-116, Transport Airplane Directorate, 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 International Branch, send it to the 
attention of the person identified in paragraph (m)(2) of this AD. 
Information may be emailed to: [email protected]. 
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.
    (2) Contacting the Manufacturer: Except as required by paragraph 
(h)(2) of this AD: For any requirement in this AD to obtain 
corrective actions from a manufacturer, the action must be 
accomplished using a method approved by the Manager, International 
Branch, ANM-116, Transport Airplane Directorate, FAA; or the 
European Aviation Safety Agency (EASA); or Airbus's EASA Design 
Organization Approval (DOA). If approved by the DOA, the approval 
must include the DOA-authorized signature.
    (3) Required for Compliance (RC): Except as required by 
paragraph (h)(2) of this AD: If any service information contains 
procedures or tests that are identified as RC, those procedures and 
tests must be done to comply with this AD; any procedures or tests 
that are not identified as RC are recommended. Those procedures and 
tests that are not identified as RC may be deviated from using 
accepted methods in accordance with the operator's maintenance or 
inspection program without obtaining approval of an AMOC, provided 
the procedures and tests identified as RC can be done and the 
airplane can be put back in an airworthy condition. Any 
substitutions or changes to procedures or tests identified as RC 
require approval of an AMOC.

(m) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) EASA AD 2016-0196, dated September 30, 2016, for related 
information. This MCAI may be found in the AD docket on the Internet 
at http://www.regulations.gov by searching for and locating Docket 
No. FAA-2017-0560.
    (2) For more information about this AD, contact Dan Rodina, 
Aerospace Engineer, International Branch, ANM-116, Transport 
Airplane Directorate, FAA, 1601 Lind Avenue SW., Renton, WA 98057-
3356; telephone: 425-227-2125; fax: 425-227-1149.
    (3) For service information identified in this AD, contact 
Airbus SAS, Airworthiness Office--EAW, 1 Rond Point Maurice 
Bellonte, 31707 Blagnac Cedex, France; telephone: +33 5 61 93 36 96; 
fax: +33 5 61 93 44 51; email: [email protected]; 
Internet: http://www.airbus.com. You may view this service 
information at the FAA, Transport Airplane Directorate, 1601 Lind 
Avenue SW., Renton, WA. For information on the availability of this 
material at the FAA, call 425 227-1221.

    Issued in Renton, Washington, on June 9, 2017.
Michael Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2017-12613 Filed 6-19-17; 8:45 am]
 BILLING CODE 4910-13-P