
[Federal Register Volume 82, Number 103 (Wednesday, May 31, 2017)]
[Proposed Rules]
[Pages 24906-24910]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-10978]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0516; Directorate Identifier 2016-NM-125-AD]
RIN 2120-AA64


Airworthiness Directives; ATR--GIE Avions de Transport 
R[eacute]gional Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to supersede Airworthiness Directive (AD) 2015-23-
12, for all ATR--GIE Avions de Transport R[eacute]gional Model ATR42 
and ATR72 airplanes. AD 2015-23-12 currently requires identifying the 
serial number and part number of the main landing gear (MLG) rear hinge 
pins, and replacing pins or the MLG if necessary. Since we issued AD 
2015-23-12, we have received a new report of a certain cracked MLG 
hinge pin on a Model ATR42 airplane. We have determined that certain 
additional MLG hinge pins must be replaced, and certain compliance 
times must be reduced. This proposed AD would require identifying the 
serial number and part number of the MLG rear hinge pins, and replacing 
pins 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 July 17, 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 W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE., Washington, DC, between 9 a.m. and 5 p.m., Monday 
through Friday, except Federal holidays.
    For service information identified in this NPRM, contact ATR--GIE 
Avions de Transport R[eacute]gional, 1, All[eacute]e Pierre Nadot, 
31712 Blagnac Cedex, France; telephone +33 (0) 5 62 21 62 21; fax +33 
(0) 5 62 21 67 18; email continued.airworthiness@atr.fr; Internet 
http://www.aerochain.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-
0516; 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: Shahram Daneshmandi, Aerospace 
Engineer, International Branch, ANM-116, Transport Airplane 
Directorate, FAA, 1601 Lind Avenue SW., Renton, WA 98057-3356; 
telephone 425-227-1112; 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-2017-0516; 
Directorate Identifier 2016-NM-125-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

    On November 12, 2015, we issued AD 2015-23-12, Amendment 39-18329 
(80 FR 73096, November 24, 2015) (``AD 2015-23-12''), for all ATR--GIE 
Avions de Transport R[eacute]gional Model ATR42 and ATR72 airplanes. AD 
2015-23-12 was prompted by new occurrences of certain cracked MLG rear 
hinge pins. AD 2015-23-12 requires identifying the serial number and 
part number of the MLG rear hinge pins, and replacing pins or the MLG 
if necessary. We issued AD 2015-23-12 to detect and correct cracked 
rear hinge pins, which could lead to MLG structural failure, possibly 
resulting in collapse of the MLG and consequent injury to the occupants 
of the airplane.
    Since we issued AD 2015-23-12, we have received a new report of a 
cracked MLG hinge pin having P/N D62055 on a Model ATR42 airplane. We 
have determined that certain additional MLG hinge pins must be 
replaced, and certain compliance times must be reduced.
    The European Aviation Safety Agency (EASA), which is the Technical 
Agent for the Member States of the European Union, has issued EASA 
Airworthiness Directive 2016-0135, dated July 8, 2016 (referred to 
after this as the Mandatory Continuing Airworthiness Information, or 
``the MCAI''), to correct an unsafe condition for all ATR--GIE Avions 
de Transport R[eacute]gional Model ATR42 and ATR72 airplanes. The MCAI 
states:

    Prompted by cases of rupture of main landing gear (MLG) rear 
hinge pin part number (P/N) D61000 encountered in service in 1994 
and 1996, DGAC [Direction G[eacute]n[eacute]rale de l'Aviation 
Civile] France issued AD 96-131-064 (B) for ATR42 aeroplanes and AD 
96-096-029 (B) for ATR72 aeroplanes to

[[Page 24907]]

require inspection and, depending on findings, corrective action. 
Since those [French] ADs were issued, new occurrences of cracked 
rear hinge pin P/N [part number] D61000 were reported on ATR72 MLG. 
The result of subsequent investigation revealed that the affected 
pins were subjected to a non-detected thermal abuse done in 
production during grinding process. Analysis also showed that other 
MLG pin P/N's could be affected by the same production issue.
    This condition, if not detected and corrected, could lead to 
structural failure and consequent collapse of the MLG, possibly 
resulting in damage to the aeroplane and injury to the occupants.
    To address this potential unsafe condition, EASA issued AD 2014-
0074 [which corresponds to FAA AD 2015-23-12] to require inspection 
and, depending on findings, replacement of affected pins.
    After EASA AD 2014-0074 was issued, a new occurrence was 
reported of a cracked MLG hinge pin P/N D62055 installed on the MLG 
Side Brace of an ATR42 aeroplane. This new occurrence was also 
identified as related to a non-detected thermal abuse done in 
production during grinding process.
    Prompted by this new occurrence, Messier Bugatti Dowty (MBD) 
updated the list of MLG hinge pins affected by this unsafe condition 
by adding serial numbers (S/N), which were previously not considered 
by EASA AD 2014-0074. In addition, it was determined that the 
compliance time for replacement of pins with P/N D62055 must be 
reduced. The six affected MBD Service Bulletins (SB) were revised 
accordingly, and six new ones were also published to address this 
issue.
    For the reasons described above, this [EASA] AD retains the 
requirements of EASA AD 2014-0074, which is superseded, but 
addresses an expanded MLG hinge pin population with appropriate 
compliance time(s).

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-
0516.

Related Service Information Under 1 CFR Part 51

    Messier-Bugatti-Dowty has issued the following service information, 
which describes procedures for inspecting and replacing the MLG hinge 
pin. These documents are distinct since they apply to different 
airplane models and different MLG hinge pin part numbers.
     Service Bulletin 631-32-213, Revision 2, dated March 15, 
2016.
     Service Bulletin 631-32-214, Revision 1, dated March 15, 
2016.
     Service Bulletin 631-32-215, Revision 1, dated March 15, 
2016.
     Service Bulletin 631-32-216, Revision 3, dated March 15, 
2016.
     Service Bulletin 631-32-219, Revision 1, dated March 15, 
2016.
     Service Bulletin 631-32-220, Revision 1, dated March 15, 
2016.
     Service Bulletin 631-32-224, dated March 15, 2016.
     Service Bulletin 631-32-231, dated March 15, 2016.
     Service Bulletin 631-32-232, Revision 1, dated March 15, 
2016.
     Service Bulletin 631-32-233, dated March 15, 2016.
     Service Bulletin 631-32-234, dated March 15, 2016.
     Service Bulletin 631-32-235, dated March 15, 2016.
    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 of the same 
type designs.

Differences Between This Proposed AD and the MCAI or Service 
Information

    In MCAI table 1 and table 2, the MCAI specifies the compliance time 
terminology, ``whichever occurs later,'' between compliance time A and 
B. However, this proposed AD specifies the phrase, ``whichever occurs 
first,'' instead of ``whichever occurs later.'' This difference has 
been coordinated with EASA and ATR--GIE Avions de Transport 
R[eacute]gional.

Costs of Compliance

    We estimate that this proposed AD affects 63 airplanes of U.S. 
registry.
    The actions required by AD 2015-23-12, and retained in this 
proposed AD take about 8 work-hours per product, at an average labor 
rate of $85 per work-hour. Required parts will cost about $16,000 per 
product. Based on these figures, the estimated cost of the actions that 
are required by AD 2015-23-12 is $16,680 per product.
    We also estimate that it would take about 8 work-hours per product 
to comply with the basic requirements of this proposed AD. The average 
labor rate is $85 per work-hour. Required parts would cost about 
$16,000 per product. Based on these figures, we estimate the cost of 
this proposed AD on U.S. operators to be $1,050,840, or $16,680 per 
product.
    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,

[[Page 24908]]

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 removing Airworthiness Directive (AD) 
2015-23-12, Amendment 39-18329 (80 FR 73096, November 24, 2015), and 
adding the following new AD:

ATR-GIE Avions de Transport R[eacute]gional: Docket No. FAA-2017-
0516; Directorate Identifier 2016-NM-125-AD.

(a) Comments Due Date

    We must receive comments by July 17, 2017.

(b) Affected ADs

    This AD replaces AD 2015-23-12, Amendment 39-18329 (80 FR 73096, 
November 24, 2015) (``AD 2015-23-12'').

(c) Applicability

    This AD applies to ATR-GIE Avions de Transport R[eacute]gional 
Model ATR42-200, -300, -320, and -500 airplanes; and ATR72-101, -
201, -102, -202, -211, -212, and -212A airplanes; certificated in 
any category; all certified models; all manufacturer serial numbers.

(d) Subject

    Air Transport Association (ATA) of America Code 32, Landing 
Gear.

(e) Reason

    This AD was prompted by a new occurrence of a cracked main 
landing gear (MLG) rear hinge pin. We are issuing this AD to detect 
and correct cracked rear hinge pins, which could lead to MLG 
structural failure, possibly resulting in collapse of the MLG and 
consequent injury to the occupants of the airplane.

(f) Compliance

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

(g) Retained Hinge Pin Identification and Replacement for Model ATR72 
Airplanes, With Terminating Action

    This paragraph restates the requirements of paragraph (g) of AD 
2015-23-12, with terminating action. For Model ATR72 airplanes: 
Within 12 months after December 29, 2015 (the effective date of AD 
2015-23-12), inspect for the serial number of the left-hand (LH) and 
right-hand (RH) MLG rear hinge pins having part number (P/N) D61000. 
A review of airplane maintenance records is acceptable in lieu of 
this identification if the part number and serial number of the LH 
and RH MLG rear hinge pins can be conclusively determined from that 
review. If a rear hinge pin having P/N D61000 has a serial number 
listed in Messier-Bugatti-Dowty Service Bulletin 631-32-213, dated 
December 16, 2013; or Messier-Bugatti-Dowty Service Bulletin 631-32-
216, Revision 1, dated December 17, 2013; as applicable: Within 12 
months after December 29, 2015, replace the pin with a serviceable 
part as identified in paragraph (h) of this AD, in accordance with 
the Accomplishment Instructions of Messier-Bugatti-Dowty Service 
Bulletin 631-32-213, dated December 16, 2013; or Messier-Bugatti-
Dowty Service Bulletin 631-32-216, Revision 1, dated December 17, 
2013; as applicable. Accomplishment of the actions required by 
paragraph (l) of this AD terminates the inspection required by this 
paragraph. Accomplishing the actions required by paragraph (m) or 
(o) of this AD terminates the actions required by this paragraph.

(h) Retained Definition of Serviceable Hinge Pin for Model ATR72 
Airplanes for Paragraph (g) of this AD, With No Changes

    This paragraph restates the definition in paragraph (h) of AD 
2015-23-12, with no changes. For Model ATR72 airplanes: For purposes 
of paragraph (g) of this AD, a serviceable MLG rear hinge pin is a 
pin that is specified in paragraph (h)(1) or (h)(2) of this AD.
    (1) A hinge pin that is not identified in Messier-Bugatti-Dowty 
Service Bulletin 631-32-213, dated December 16, 2013; or Messier-
Bugatti-Dowty Service Bulletin 631-32-216, Revision 1, dated 
December 17, 2013; as applicable.
    (2) A hinge pin that has been inspected and reconditioned, in 
accordance with the Accomplishment Instructions of Messier-Bugatti-
Dowty Service Bulletin 631-32-213, dated December 16, 2013; or 
Messier-Bugatti-Dowty Service Bulletin 631-32-216, Revision 1, dated 
December 17, 2013; as applicable.

(i) Retained MLG Pin Identification and Replacement for Model ATR72 
Airplanes, With Terminating Action

    This paragraph restates the requirements of paragraph (i) of AD 
2015-23-12, with terminating action. For Model ATR72 airplanes: At 
the earlier of the times specified in paragraphs (i)(1) and (i)(2) 
of this AD, inspect all LH and RH MLG pins for a part number and 
serial number listed in Messier-Bugatti-Dowty Service Bulletin 631-
32-214, dated January 13, 2014; or Messier-Bugatti-Dowty Service 
Bulletin 631-32-219, dated March 3, 2014; as applicable. A review of 
airplane maintenance records is acceptable in lieu of this 
inspection if the part number and serial number of the LH and RH MLG 
pin can be conclusively determined from that review. If any affected 
MLG pin is found: At the earlier of the compliance times specified 
in paragraphs (i)(1) and (i)(2) of this AD, replace the MLG with a 
serviceable MLG as identified in paragraph (j) of this AD, using a 
method approved by the Manager, International Branch, ANM-116, 
Transport Airplane Directorate, FAA; or the European Aviation Safety 
Agency (EASA); or ATR-GIE Avions de Transport R[eacute]gional's EASA 
Design Organization Approval (DOA). Accomplishment of the actions 
required by paragraph (l) of this AD terminates the inspection for 
the part number and serial number of the LH and RH MLG rear hinge 
pins required by this paragraph. Accomplishment of the actions 
required by paragraph (m) or (o) of this AD terminates the actions 
required by this paragraph.
    (1) No later than the next MLG overhaul scheduled after December 
29, 2015 (the effective date of AD 2105-23-12).
    (2) Within 20,000 flight cycles or 9 years, whichever occurs 
first, accumulated since installation of the MLG on an airplane 
since new or since last overhaul, as applicable.

(j) Retained Definition of Serviceable MLG for Model ATR72 Airplanes 
for Paragraph (i) of this AD, With No Changes

    This paragraph restates the definition in paragraph (j) of AD 
2015-23-12, with no changes. For Model ATR72 airplanes: For purposes 
of paragraph (i) of this AD, a serviceable MLG is one that 
incorporates pins specified in paragraph (j)(1) or (j)(2) of this 
AD.
    (1) Pins that are not identified in Messier-Bugatti-Dowty 
Service Bulletin 631-32-214, dated January 13, 2014; or Messier-
Bugatti-Dowty Service Bulletin 631-32-219, dated March 3, 2014; as 
applicable.
    (2) Pins that have been inspected and reconditioned in 
accordance with the Accomplishment Instructions of Messier-Bugatti-
Dowty Service Bulletin 631-32-214, dated January 13, 2014; or 
Messier-Bugatti-Dowty Service Bulletin 631-32-219, dated March 3, 
2014; as applicable.

(k) Retained MLG Pin Identification and Replacement for Model ATR42 
Airplanes, With Terminating Action

    This paragraph restates the requirements of paragraph (k) of AD 
2015-23-12, with terminating action. Accomplishment of the actions 
required by paragraph (l) of this AD terminates the actions required 
by paragraph (k)(1) of this AD. Accomplishment of the actions 
required by paragraph (m) or (o) of this AD terminates the actions 
required by paragraph (k)(2) of this AD.
    (1) For Model ATR42 airplanes: Within the compliance time 
identified in paragraph (k)(1)(i) or (k)(1)(ii) of this AD, 
whichever occurs first, inspect for any LH and RH MLG pins having a 
part number and serial number listed in Messier-Bugatti-Dowty 
Service Bulletin 631-32-215, dated January 13, 2014; or Messier-
Bugatti-Dowty Service Bulletin 631-32-220, dated March 3, 2014; as 
applicable. A review of airplane maintenance records is acceptable 
in lieu of this identification if the part number and serial number 
of the LH and RH MLG pin can be conclusively determined from that 
review.
    (i) No later than the next MLG overhaul scheduled after December 
29, 2015 (the effective date of AD 2015-23-12).
    (ii) Within 20,000 flight cycles or 9 years, whichever occurs 
first, accumulated since installation of the MLG on an airplane 
since new or since last overhaul, as applicable.
    (2) If the MLG pin having a part number and serial number listed 
in Messier-Bugatti-Dowty Service Bulletin 631-32-215, dated January 
13, 2014; or Messier-Bugatti-Dowty Service Bulletin 631-32-220, 
dated March 3, 2014; as applicable; is found to be installed

[[Page 24909]]

during the identification required by paragraph (k)(1) of this AD, 
within the compliance time identified in paragraph (k)(1) of this 
AD, replace the MLG with a serviceable MLG, using a method approved 
by the Manager, International Branch, ANM-116, Transport Airplane 
Directorate, FAA; or the EASA; or ATR-GIE Avions de Transport 
R[eacute]gional's EASA DOA. For the purposes of this paragraph, a 
serviceable MLG is a part that has pins identified in paragraph 
(k)(2)(i) or (k)(2)(ii) of this AD.
    (i) Pins that are not listed in Messier-Bugatti-Dowty Service 
Bulletin 631-32-215, dated January 13, 2014; or Messier-Bugatti-
Dowty Service Bulletin 631-32-220, dated March 3, 2014; as 
applicable.
    (ii) Pins that have been inspected and reconditioned, in 
accordance with the Accomplishment Instructions of Messier-Bugatti-
Dowty Service Bulletin 631-32-215, dated January 13, 2014; or 
Messier-Bugatti-Dowty Service Bulletin 631-32-220, dated March 3, 
2014; as applicable.

(l) New Requirement of This AD: Hinge Pin Identification

    Within the applicable compliance time specified in, and in 
accordance with the Accomplishment Instructions of, the applicable 
Messier-Bugatti-Dowty Service Bulletin specified in figure 1 to 
paragraphs (l) through (p) of this AD or figure 2 to paragraphs (l) 
through (p) of this AD, as applicable to the airplane model and MLG 
hinge part number, identify the serial number (S/N) of the LH and RH 
MLG hinge pins. A review of airplane maintenance records is 
acceptable in lieu of this identification if the part number and 
serial number of the LH and RH MLG hinge pins can be conclusively 
determined from that review. Accomplishment of the actions required 
by this paragraph terminates the inspections required by paragraphs 
(g), (i), and (k)(1) of this AD.

Figure 1 to Paragraphs (l) Through (p) of This AD--Model ATR72 Airplanes
------------------------------------------------------------------------
                               Applicable Messier-
     MLG Hinge part Nos.          Bugatti-Dowty        Compliance time
                                Service Bulletins
------------------------------------------------------------------------
D60955, D60968, D60999,       Messier-Bugatti-      A or B, whichever
 D61032, D61061.               Dowty Service         occurs first:
                               Bulletin 631-32-     A: Not later than
                               214, Revision 1,      the next scheduled
                               dated March 15,       MLG overhaul after
                               2016                  the effective date
                              Messier-Bugatti-       of this AD.
                               Dowty Service        B: Within 20,000
                               Bulletin 631-32-      flight cycles or 9
                               219, Revision 1,      years, whichever
                               dated March 15,       occurs first,
                               2016, or.             accumulated since
                              Messier-Bugatti-       first installation
                               Dowty Service         of a MLG on an
                               Bulletin 631-32-      airplane since new,
                               233, dated March      or since last
                               15, 2016.             overhaul, as
                                                     applicable.
D61000......................  Messier-Bugatti-      Within 12 months
                               Dowty Service         after the effective
                               Bulletin 631-32-      date of this AD.
                               213, Revision 2,
                               dated March 15,
                               2016
                              Messier-Bugatti-
                               Dowty Service
                               Bulletin 631-32-
                               216, Revision 3,
                               dated March 15,
                               2016, or.
                              Messier-Bugatti-
                               Dowty Service
                               Bulletin 631-32-
                               232, Revision 1,
                               dated March 15,
                               2016.
------------------------------------------------------------------------


                    Figure 2 to Paragraphs (l) Through (p) of This AD--Model ATR42 Airplanes
----------------------------------------------------------------------------------------------------------------
                                                           Applicable Messier-Bugatti-
        MLG Hinge part Nos.           Airplane model(s)      Dowty Service Bulletins        Compliance time
----------------------------------------------------------------------------------------------------------------
D62054, D63823, D63825............  All..................  Messier-Bugatti-Dowty       A or B, whichever occurs
                                                            Service Bulletin 631-32-    first:
                                                            215, Revision 1, dated     A: Not later than the
                                                            March 15, 2016              next scheduled MLG
                                                           Messier-Bugatti-Dowty        overhaul after the
                                                            Service Bulletin 631-32-    effective date of this
                                                            220, Revision 1, dated      AD.
                                                            March 15, 2016, or.        B: Within 20,000 flight
                                                           Messier-Bugatti-Dowty        cycles or 9 years,
                                                            Service Bulletin 631-32-    whichever occurs first,
                                                            235, dated March 15, 2016.  accumulated since first
                                                                                        installation of a MLG on
                                                                                        an airplane since new,
                                                                                        or since last overhaul,
                                                                                        as applicable.
D56800, D56800-1, D56809, D56841,   ATR42-300............  Messier-Bugatti-Dowty       A or B, whichever occurs
 D57261, D57401, D57407, D58807,                            Service Bulletin 631-32-    first:
 D62079.                                                    215, Revision 1, dated     A: Not later than the
                                                            March 15, 2016              next scheduled MLG
                                                           Messier-Bugatti-Dowty        overhaul after the
                                                            Service Bulletin 631-32-    effective date of this
                                                            220, Revision 1, dated      AD.
                                                            March 15, 2016, or.        B: Within 20,000 flight
                                                           Messier-Bugatti-Dowty        cycles or 9 years,
                                                            Service Bulletin 631-32-    whichever occurs first,
                                                            235, dated March 15, 2016.  accumulated since first
                                                                                        installation of a MLG on
                                                                                        an airplane since new,
                                                                                        or since last overhaul,
                                                                                        as applicable.
D62055............................  All..................  Messier-Bugatti-Dowty       Within 24 months after
                                                            Service Bulletin 631-32-    the effective date of
                                                            224,                        this AD.
                                                           Messier-Bugatti-Dowty
                                                            Service Bulletin 631-32-
                                                            231, or.
                                                           Messier-Bugatti-Dowty
                                                            Service Bulletin 631-32-
                                                            234.
----------------------------------------------------------------------------------------------------------------

(m) New MLG Hinge Pin Replacement

    If, during the identification required by paragraph (l) of this 
AD, an MLG hinge pin with a serial number listed in the applicable 
Messier-Bugatti-Dowty Service Bulletin is found to be installed: 
Within the compliance time specified in figure 1 to paragraphs (l) 
through (p) of this AD or figure 2 to paragraphs (l) through (p) of 
this AD, as applicable to airplane model and MLG hinge pin part 
number, replace each affected MLG hinge pin with a serviceable MLG 
hinge pin. The replacement must be done in accordance with the 
Accomplishment Instructions of the applicable Messier-Bugatti-Dowty 
Service Bulletin specified in figure 1 to paragraphs (l) through (p) 
of this AD or figure 2 to paragraphs (l) through (p) of this AD, as 
applicable to the airplane model and MLG hinge part number, except 
as required by paragraph (o) of this AD. Accomplishment of the 
actions required by this paragraph terminates the actions required 
by paragraphs (g) and (i) of this AD. Accomplishment of the actions 
required by this paragraph terminates the replacement required by 
paragraph (k)(2) of this AD.

(n) New Definition of Serviceable Hinge Pins for Paragraph (m) of This 
AD

    For the purpose of paragraph (m) of this AD, a serviceable MLG 
hinge pin is a pin that

[[Page 24910]]

is specified in paragraph (n)(1) or (n)(2) of this AD.
    (1) A hinge pin that does not belong to the identified batch as 
listed in the applicable Messier-Bugatti-Dowty Service Bulletin 
specified in figure 1 to paragraphs (l) through (p) of this AD or 
figure 2 to paragraphs (l) through (p) of this AD, as applicable to 
the airplane model and MLG hinge part number.
    (2) A hinge pin that can be identified, through the MLG 
maintenance records, as having been inspected and reconditioned in 
accordance with the Accomplishment Instructions of the applicable 
Messier-Bugatti-Dowty Service Bulletin specified in figure 1 to 
paragraphs (l) through (p) of this AD or figure 2 to paragraphs (l) 
through (p) of this AD, as applicable to the airplane model and MLG 
hinge part number.

(o) New MLG Hinge Pin Replacement Procedures

    If, during accomplishment of the MLG hinge pin replacement 
required by paragraph (m) of this AD, the applicable Messier-
Bugatti-Dowty Service Bulletin specified in figure 1 to paragraphs 
(l) through (p) of this AD or figure 2 to paragraphs (l) through (p) 
of this AD does not specify the MLG hinge pin replacement procedure, 
do the MLG hinge pin replacement using a method approved by the 
Manager, International Branch, ANM-116, Transport Airplane 
Directorate, FAA; or the EASA; or ATR-GIE Avions de Transport 
R[eacute]gional's EASA DOA. Do the MLG hinge pin replacement at the 
applicable compliance time specified in paragraph (m) of this AD. 
Accomplishment of the actions required by this paragraph terminates 
the hinge pin replacement required by paragraphs (g), (i), and 
(k)(2) of this AD.

(p) New Parts Installation Limitation

    As of the effective date of this AD, no person may install on 
any airplane an MLG hinge pin having a part number identified in 
figure 1 to paragraphs (l) through (p) of this AD or figure 2 to 
paragraphs (l) through (p) of this AD, and having a serial number 
defined in the applicable Messier-Bugatti-Dowty Service Bulletin 
specified in figure 1 to paragraphs (l) through (p) of this AD or 
figure 2 to paragraphs (l) through (p) of this AD, as applicable to 
the airplane model and MLG hinge part number, unless the part can be 
conclusively identified, through the MLG maintenance records, as 
having been inspected and reconditioned in accordance with the 
Accomplishment Instructions of the applicable Messier-Bugatti-Dowty 
Service Bulletin.

(q) Credit for Previous Actions

    (1) This paragraph restates the credit provided in paragraph (l) 
of AD 2015-23-12, with no changes. This paragraph provides credit 
for the actions required by paragraph (g) of this AD, if those 
actions were performed before December 29, 2015 (the effective date 
of AD 2105-23-12), using Messier-Bugatti-Dowty Service Bulletin 631-
32-216, dated October 30, 2013, which is not incorporated by 
reference in this AD.
    (2) This paragraph provides credit for the actions required by 
paragraphs (l) and (m) of this AD, if those actions were done before 
the effective date of this AD using the applicable service 
information specified in paragraph (q)(2)(i) through (q)(2)(x) of 
this AD.
    (i) Messier-Bugatti-Dowty Service Bulletin 631-32-213, December 
16, 2013, which was incorporated by reference on December 29, 2015 
(80 FR 73096, November 24, 2015).
    (ii) Messier-Bugatti-Dowty Service Bulletin 631-32-213, Revision 
1, dated December 8, 2014, which is not incorporated by reference in 
this AD.
    (iii) Messier-Bugatti-Dowty Service Bulletin 631-32-214, dated 
January 13, 2014, which was incorporated by reference on December 
29, 2015 (80 FR 73096, November 24, 2015).
    (iv) Messier-Bugatti-Dowty Service Bulletin 631-32-215, dated 
January 13, 2014, which was incorporated by reference on December 
29, 2015 (80 FR 73096, November 24, 2015).
    (v) Messier-Bugatti-Dowty Service Bulletin 631-32-216, dated 
October 30, 2013, which is not incorporated by reference in this AD.
    (vi) Messier-Bugatti-Dowty Service Bulletin 631-32-216, Revision 
1, dated December 17, 201, which was incorporated by reference on 
December 29, 2015 (80 FR 73096, November 24, 2015).
    (vii) Messier-Bugatti-Dowty Service Bulletin 631-32-216, 
Revision 2, dated December 8, 2014, which is not incorporated by 
reference in this AD.
    (viii) Messier-Bugatti-Dowty Service Bulletin 631-32-219, dated 
March 3, 2014, which was incorporated by reference on December 29, 
2015 (80 FR 73096, November 24, 2015).
    (ix) Messier-Bugatti-Dowty Service Bulletin 631-32-220, dated 
March 3, 2014, which was incorporated by reference on December 29, 
2015 (80 FR 73096, November 24, 2015).
    (x) Messier-Bugatti-Dowty Service Bulletin 631-32-232, dated 
December 8, 2014, which is not incorporated by reference in this AD.

(r) 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 (s)(2) of this AD. 
Information may be emailed to: 9-ANM-116-AMOC-REQUESTS@faa.gov.
    (i) 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.
    (ii) AMOCs approved previously for AD 2015-23-12 are approved as 
AMOCs for the corresponding provisions of this AD.
    (2) Contacting the Manufacturer: As of the effective date 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 EASA; or ATR-GIE Avions de 
Transport R[eacute]gional's EASA DOA. If approved by the DOA, the 
approval must include the DOA-authorized signature.

(s) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) EASA Airworthiness Directive 2016-0135, dated July 8, 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-2017-0516.
    (2) For more information about this AD, contact Shahram 
Daneshmandi, Aerospace Engineer, International Branch, ANM-116, 
Transport Airplane Directorate, FAA, 1601 Lind Avenue SW., Renton, 
WA 98057-3356; telephone 425-227-1112; fax 425-227-1149.
    (3) For service information identified in this AD, contact ATR-
GIE Avions de Transport R[eacute]gional, 1, All[eacute]e Pierre 
Nadot, 31712 Blagnac Cedex, France; telephone +33 (0) 5 62 21 62 21; 
fax +33 (0) 5 62 21 67 18; email continued.airworthiness@atr.fr; 
Internet http://www.aerochain.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 May 19, 2017.
Victor Wicklund,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2017-10978 Filed 5-30-17; 8:45 am]
 BILLING CODE 4910-13-P


