Document ID: FAA-2017-0516-0003
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: ATR-GIE Avions de Transport Regional Airplanes
Posted Date: 2017-08-25T04:00Z

[Federal Register Volume 82, Number 164 (Friday, August 25, 2017)]
[Rules and Regulations]
[Pages 40479-40484]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-17398]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0516; Product Identifier 2016-NM-125-AD; Amendment 
39-19000; AD 2017-17-10]
RIN 2120-AA64

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

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

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

SUMMARY: We are superseding Airworthiness Directive (AD) 2015-23-12, 
which applied to all ATR-GIE Avions de Transport R[eacute]gional Model 
ATR42 and ATR72 airplanes. AD 2015-23-12 required identifying the 
serial number and part number of the main landing gear (MLG) rear hinge 
pins, and replacing pins or the MLG if necessary. This AD retains the 
requirements of AD 2015-23-12, requires replacing certain additional 
MLG hinge pins, and reduces certain compliance times. This AD was 
prompted by a new occurrence of a cracked MLG rear hinge pin. We are 
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective September 29, 2017.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of September 29, 
2017.

[[Page 40480]]

    The Director of the Federal Register approved the incorporation by 
reference of certain other publications listed in this AD as of 
December 29, 2015 (80 FR 73096, November 24, 2015).

ADDRESSES: For service information identified in this final rule, 
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 Standards Branch, 1601 Lind Avenue 
SW., Renton, WA. For information on the availability of this material 
at the FAA, call 425-227-1221. It is also available on the Internet at 
http://www.regulations.gov by searching for and locating Docket No. 
FAA-2017-0516.

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 AD, the regulatory evaluation, any comments received, and 
other information. The address for the Docket Office (telephone 800-
647-5527) is Docket 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: Shahram Daneshmandi, Aerospace 
Engineer, International Section, Transport Standards Branch, FAA, 1601 
Lind Avenue SW., Renton, WA 98057-3356; telephone 425-227-1112; fax 
425-227-1149.

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to supersede AD 2015-23-12, Amendment 39-18329 (80 FR 73096, 
November 24, 2015) (``AD 2015-23-12''). AD 2015-23-12 applied to all 
ATR-GIE Avions de Transport R[eacute]gional Model ATR42 and ATR72 
airplanes. The NPRM published in the Federal Register on May 31, 2017 
(82 FR 24906). The NPRM was prompted by a new occurrence of a cracked 
MLG rear hinge pin. The NPRM proposed to continue to require 
identifying the serial number and part number of the MLG rear hinge 
pins, and replacing pins or the MLG if necessary. The NPRM also 
proposed to require replacing certain additional MLG hinge pins, and 
reducing certain compliance times. 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.
    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 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.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM or on the determination of 
the cost to the public.

Conclusion

    We reviewed the available data and determined that air safety and 
the public interest require adopting this AD as proposed except for 
minor editorial changes. We have determined that these minor changes:
     Are consistent with the intent that was proposed in the 
NPRM for correcting the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.

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.

Costs of Compliance

    We estimate that this AD will affect 63 airplanes of U.S. registry.

[[Page 40481]]

    The actions required by AD 2015-23-12, and retained in this 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 will take about 8 work-hours per product 
to comply with the basic requirements of this AD. The average labor 
rate is $85 per work-hour. Required parts will cost about $16,000 per 
product. Based on these figures, we estimate the cost of this 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 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.
    This AD is issued in accordance with authority delegated by the 
Executive Director, Aircraft Certification Service, as authorized by 
FAA Order 8000.51C. In accordance with that order, issuance of ADs is 
normally a function of the Compliance and Airworthiness Division, but 
during this transition period, the Executive Director has delegated the 
authority to issue ADs applicable to transport category airplanes to 
the Director of the System Oversight Division.

Regulatory Findings

    We determined that 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 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.

Adoption of the Amendment

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

2017-17-10 ATR-GIE Avions de Transport R[eacute]gional: Amendment 
39-19000; Docket No. FAA-2017-0516; Product Identifier 2016-NM-125-
AD.

(a) Effective Date

    This AD is effective September 29, 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.

[[Page 40482]]

(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 Section, Transport 
Standards Branch, 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 2015-23-12).
    (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 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 Section, Transport Standards Branch, 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             A: Not later than
                               631[dash]32-214,      the next scheduled
                               Revision 1, dated     MLG overhaul after
                               March 15, 2016,       the effective date
                              Messier-Bugatti-       of this AD.
                               Dowty Service        B: Within 20,000
                               Bulletin              flight cycles or 9
                               631[dash]32-219,      years, whichever
                               Revision 1, dated     occurs first,
                               March 15, 2016, or.   accumulated since
                              Messier-Bugatti-       first installation
                               Dowty Service         of a MLG on an
                               Bulletin              airplane since new,
                               631[dash]32-233,      or since last
                               dated March 15,       overhaul, as
                               2016..                applicable.
D61000......................  Messier-Bugatti-      Within 12 months
                               Dowty Service         after the effective
                               Bulletin              date of this AD.
                               631[dash]32-213,
                               Revision 2, dated
                               March 15, 2016,
                              Messier-Bugatti-
                               Dowty Service
                               Bulletin
                               631[dash]32-216,
                               Revision 3, dated
                               March 15, 2016, or
                              Messier-Bugatti-
                               Dowty Service
                               Bulletin
                               631[dash]32-232,
                               Revision 1, dated
                               March 15, 2016.
------------------------------------------------------------------------

[[Page 40483]]

                    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            first:
                                                            631[dash]32[dash]215,      A: Not later than the
                                                            Revision 1, dated March     next scheduled MLG
                                                            15, 2016,                   overhaul after the
                                                                                        effective date of this
                                                                                        AD.
                                                           Messier-Bugatti-Dowty       B: Within 20,000 flight
                                                            Service Bulletin            cycles or 9 years,
                                                            631[dash]32[dash]220,       whichever occurs first,
                                                            Revision 1, dated March     accumulated since first
                                                            15, 2016, or                installation of a MLG on
                                                           Messier-Bugatti-Dowty        an airplane since new,
                                                            Service Bulletin            or since last overhaul,
                                                            631[dash]32[dash]235,       as applicable.
                                                            dated March 15, 2016..
D56800, D56800-1, D56809, D56841,   ATR42-300............  Messier-Bugatti-Dowty       A or B, whichever occurs
 D57261, D57401, D57407, D58807,                            Service Bulletin            first:
 D62079.                                                    631[dash]32[dash]215,      A: Not later than the
                                                            Revision 1, dated March     next scheduled MLG
                                                            15, 2016,                   overhaul after the
                                                           Messier-Bugatti-Dowty        effective date of this
                                                            Service Bulletin            AD.
                                                            631[dash]32[dash]220,      B: Within 20,000 flight
                                                            Revision 1, dated March     cycles or 9 years,
                                                            15, 2016, or.               whichever occurs first,
                                                           Messier-Bugatti-Dowty        accumulated since first
                                                            Service Bulletin            installation of a MLG on
                                                            631[dash]32[dash]235,       an airplane since new,
                                                            dated March 15, 2016..      or since last overhaul,
                                                                                        as applicable.
D62055............................  All..................  Messier-Bugatti-Dowty       Within 24 months after
                                                            Service Bulletin            the effective date of
                                                            631[dash]32[dash]224,       this AD.
                                                            dated March 15, 2016,
                                                           Messier-Bugatti-Dowty
                                                            Service Bulletin
                                                            631[dash]32[dash]231,
                                                            dated March 15, 2016, or
                                                           Messier-Bugatti-Dowty
                                                            Service Bulletin 631-32-
                                                            234, dated March 15,
                                                            2016.
----------------------------------------------------------------------------------------------------------------

(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 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 Section, Transport Standards Branch, 
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.

[[Page 40484]]

    (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 Section, Transport Standards Branch, 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 Section, Transport Standards 
Branch, 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 Section, Transport 
Standards Branch, FAA, 1601 Lind Avenue SW., Renton, WA 98057-3356; 
telephone 425-227-1112; fax 425-227-1149.
    (3) Service information identified in this AD that is not 
incorporated by reference is available at the addresses specified in 
paragraphs (t)(5) and (t)(6) of this AD.

(t) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless this AD specifies otherwise.
    (3) The following service information was approved for IBR on 
September 29, 2017.
    (i) Messier-Bugatti-Dowty Service Bulletin 631-32-213, Revision 
2, dated March 15, 2016.
    (ii) Messier-Bugatti-Dowty Service Bulletin 631-32-214, Revision 
1, dated March 15, 2016.
    (iii) Messier-Bugatti-Dowty Service Bulletin 631-32-215, 
Revision 1, dated March 15, 2016.
    (iv) Messier-Bugatti-Dowty Service Bulletin 631-32-216, Revision 
3, dated March 15, 2016.
    (v) Messier-Bugatti-Dowty Service Bulletin 631-32-219, Revision 
1, dated March 15, 2016.
    (vi) Messier-Bugatti-Dowty Service Bulletin 631-32-220, Revision 
1, dated March 15, 2016.
    (vii) Messier-Bugatti-Dowty Service Bulletin 631-32-224, dated 
March 15, 2016.
    (viii) Messier-Bugatti-Dowty Service Bulletin 631-32-231, dated 
March 15, 2016.
    (ix) Messier-Bugatti-Dowty Service Bulletin 631-32-232, Revision 
1, dated March 15, 2016.
    (x) Messier-Bugatti-Dowty Service Bulletin 631-32-233, dated 
March 15, 2016.
    (xi) Messier-Bugatti-Dowty Service Bulletin 631-32-234, dated 
March 15, 2016.
    (xii) Messier-Bugatti-Dowty Service Bulletin 631-32-235, dated 
March 15, 2016.
    (4) The following service information was approved for IBR on 
December 29, 2015 (80 FR 73096, November 24, 2015).
    (i) Messier-Bugatti-Dowty Service Bulletin 631-32-213, dated 
December 16, 2013.
    (ii) Messier-Bugatti-Dowty Service Bulletin 631-32-214, dated 
January 13, 2014.
    (iii) Messier-Bugatti-Dowty Service Bulletin 631-32-215, dated 
January 13, 2014.
    (iv) Messier-Bugatti-Dowty Service Bulletin 631-32-216, Revision 
1, dated December 17, 2013. Pages 4, 5, and 8 of this service 
bulletin are the original issue and are dated October 30, 2013.
    (v) Messier-Bugatti-Dowty Service Bulletin 631-32-219, dated 
March 3, 2014.
    (vi) Messier-Bugatti-Dowty Service Bulletin 631-32-220, dated 
March 3, 2014.
    (5) 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.
    (6) You may view this service information at the FAA, Transport 
Standards Branch, 1601 Lind Avenue SW., Renton, WA. For information 
on the availability of this material at the FAA, call 425-227-1221.
    (7) You may view this service information that is incorporated 
by reference 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/cfr/ibr-locations.html.

    Issued in Renton, Washington, on August 8, 2017.
Dionne Palermo,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2017-17398 Filed 8-24-17; 8:45 am]
BILLING CODE 4910-13-P