[Federal Register Volume 86, Number 80 (Wednesday, April 28, 2021)]
[Rules and Regulations]
[Pages 22341-22345]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-08781]



 ========================================================================
 Rules and Regulations
                                                 Federal Register
 ________________________________________________________________________
 
 This section of the FEDERAL REGISTER contains regulatory documents 
 having general applicability and legal effect, most of which are keyed 
 to and codified in the Code of Federal Regulations, which is published 
 under 50 titles pursuant to 44 U.S.C. 1510.
 
 The Code of Federal Regulations is sold by the Superintendent of Documents. 
 
 ========================================================================
 

  Federal Register / Vol. 86, No. 80 / Wednesday, April 28, 2021 / 
Rules and Regulations  

[[Page 22341]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-1182; Product Identifier 2018-SW-036-AD; Amendment 
39-21518; AD 2021-09-05]
RIN 2120-AA64


Airworthiness Directives; Airbus Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2016-08-20 
for certain Airbus Helicopters (previously Eurocopter France) EC130B4 
and EC130T2 helicopters. AD 2016-08-20 required repetitively inspecting 
the tail boom to Fenestron junction frame (junction frame) for a crack. 
This new AD continues to require inspecting the junction frame with the 
horizontal stabilizer removed, and expands the applicability, revises 
the compliance time and the inspection procedures for inspecting the 
junction frame, adds inspection procedures for certain helicopters, 
allows repair of the junction frame, and requires modifying and then 
repetitively inspecting the junction frame and reporting certain 
information. This AD was prompted by additional cracks and the 
availability of a design change that modifies the junction frame. The 
actions of this AD are intended to address an unsafe condition on these 
products.

DATES: This AD is effective June 2, 2021.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of June 2, 2021.

ADDRESSES: For service information identified in this final rule, 
contact Airbus Helicopters, 2701 N Forum Drive, Grand Prairie, TX 
75052; telephone (972) 641-0000 or (800) 232-0323; fax (972) 641-3775; 
or at https://www.airbus.com/helicopters/services/technical-support.html. You may view this referenced service information at the 
FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood 
Pkwy., Room 6N-321, Fort Worth, TX 76177. It is also available on the 
internet at https://www.regulations.gov by searching for and locating 
Docket No. FAA-2020-1182.

Examining the AD Docket

    You may examine the AD docket on the internet at https://www.regulations.gov in Docket No. FAA-2020-1182; or in person at Docket 
Operations between 9 a.m. and 5 p.m., Monday through Friday, except 
Federal holidays. The AD docket contains this AD, the European Aviation 
Safety Agency (now European Union Aviation Safety Agency) AD, any 
service information that is incorporated by reference, any comments 
received, and other information. The street address for Docket 
Operations is 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: Kristi Bradley, Aerospace Engineer, 
General Aviation & Rotorcraft Section, International Validation Branch, 
Compliance & Airworthiness Division, FAA, 10101 Hillwood Pkwy., Fort 
Worth, TX 76177; telephone (817) 222-5110; email 
[email protected].

SUPPLEMENTARY INFORMATION: 

Background

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 to remove AD 2016-08-20, Amendment 39-18497 (81 FR 26103, 
May 2, 2016) (2016-08-20), and add a new AD. AD 2016-08-20 applied to 
Airbus Helicopters Model EC130B4 and EC130T2 helicopters with a 
junction frame that has 690 or more hours time-in-service (TIS) 
installed. The NPRM published in the Federal Register on March 5, 2021 
(86 FR 12857). The NPRM proposed to require, for all Airbus Helicopters 
Model EC130B4 and EC130T2 helicopters with a junction frame:
     For helicopters without MOD 074775, or MOD AH 350A087421 
or SB EC130-53-029 installed, at a compliance time based on the hours 
TIS accumulated on the junction frame, removing the horizontal 
stabilizer, cleaning the junction frame, and visually inspecting the 
junction frame area for a crack, paying particular attention to the 
area around the 4 spars.
    [cir] Following the initial visual inspection, within 25 hours TIS 
or 390 sling cycles, whichever comes first, and thereafter at intervals 
not exceeding 25 hours TIS or 390 sling cycles, whichever comes first, 
either repeating the initial visual inspection, or, if the surface area 
is clean, borescope inspecting the junction frame area for a crack, 
paying particular attention to the area around the 4 spars.
    [cir] Also following the initial visual inspection, within 150 
hours TIS and thereafter at intervals not to exceed 150 hours TIS, 
repeating the initial visual inspection.
     For helicopters without MOD 074775 installed, but with MOD 
AH 350A087421 or SB EC130-53-029 installed, before the junction frame 
accumulates 350 hours TIS or within 10 hours TIS, whichever occurs 
later, visually inspecting for a crack on the junction frame area in 
each skin cut-out area.
    [cir] Following the initial visual inspection, within 10 hours TIS 
or 250 sling cycles, whichever occurs first, and thereafter at 
intervals not exceeding 10 hours TIS or 250 sling cycles, whichever 
occurs first, repeating the initial visual inspection.
    [cir] Also following the initial visual inspection, within 660 
hours TIS and thereafter at intervals not to exceed 660 hours TIS, 
removing the horizontal stabilizer, cleaning the junction frame, and 
dye-penetrant inspecting the junction frame area for a crack, paying 
particular attention to the area around the 4 spars.
     If there is a crack, replacing or repairing the junction 
frame in accordance with an FAA approved repair procedure before 
further flight. Repairing the junction frame would not constitute 
terminating action for the requirements of this AD.
     For helicopters without MOD 074775 installed, with or 
without MOD AH 350A087421 or SB EC130-53-029 installed, without MOD 
074609 or SB 53-024 installed, and on which the skin of the junction 
frame area has never been repaired, installing MOD 074775 within 24 
months as of the effective date

[[Page 22342]]

of this AD and reporting certain information to Airbus Helicopters 
within 30 days after installing MOD 074775.
     For helicopters without MOD 074775 installed, with MOD 
074609 or SB 53-024 installed, or on which the skin of the junction 
frame area has been previously repaired at any time, reinforcing the 
junction frame by replacing the two lateral splices which join the 
skins with four carbon patches (left-hand side, right-hand side, and 
lower sides) within 24 months as of the effective date of this AD.
     For helicopters with MOD 074775 installed or with the four 
carbon patches reinforcements installed, but without MOD 074581 for 
Model EC130T2 helicopters, within 600 hours TIS after the installation 
of MOD 074775 or the reinforcement, and thereafter at intervals not 
exceeding 600 hours TIS, visually inspect the junction frame area for a 
crack. If there is a crack, replacing or repairing the junction frame 
in accordance with an FAA approved repair procedure before further 
flight. Repairing the junction frame would not constitute terminating 
action for the requirements of this AD.
    The NPRM was prompted by a series of EASA ADs that have been issued 
since the FAA issued AD 2016-08-20, the most recent being EASA AD 2018-
0104, dated May 4, 2018 (EASA AD 2018-0104), issued by EASA, which is 
the Technical Agent for the Member States of the European Union, to 
correct an unsafe condition for Airbus Helicopters (formerly 
Eurocopter, Eurocopter France) Model EC 130 B4 and EC 130 T2 
helicopters, all serial numbers, except those with Airbus modification 
(MOD) 074775 installed. EASA's initial AD was prompted by two incidents 
of crack propagation through the junction frame that initiated in the 
lower right-hand side between the web and the flange where the lower 
spar of the tail boom is joined. EASA stated the cracks were of a 
significant length and not visible from the outside of the helicopter. 
EASA advised that this condition, if not detected, could lead to 
structural failure, possibly resulting in Fenestron detachment and 
consequent loss of control of the helicopter.
    AD 2016-08-20 was prompted by EASA AD 2015-0033-E, dated February 
24, 2015 (EASA AD 2015-0033-E). Following EASA AD 2015-0033-E, EASA 
revised its AD to EASA AD 2015-0033R1, dated May 3, 2016 (EASA AD 2015-
0033R1), which was prompted by the determination that it was not 
necessary to inspect junction frames that had accumulated less than 
1,200 flight hours. Accordingly, EASA AD 2015-0033R1 extended the 
inspection threshold from 700 flight hours to 1,200 flight hours. 
Thereafter, EASA issued EASA AD 2016-0240, dated December 2, 2016 (EASA 
AD 2016-0240) to supersede EASA AD 2015-0033R1. EASA AD 2016-0240 was 
prompted by a third incident of cracking in the same area of the 
junction frame as the first two incidents. Investigation determined 
that detection of the crack was delayed because of insufficient 
cleaning of the inspection area inside the junction frame. For that 
reason, EASA AD 2016-0240 retained the requirements of EASA AD 2015-
0033R1 and added additional cleaning requirements before inspecting. 
After EASA AD 2016-0240 was issued, a fourth incident of cracking in 
the same area of the junction frame as the first three incidents was 
reported. This fourth incident prompted EASA to issue EASA AD 2017-
0066-E, dated April 21, 2017 (EASA AD 2017-0066-E) to supersede EASA AD 
2016-0240. This fourth incident occurred on a junction frame that had 
accumulated significantly less flight hours than the first three 
incidents. In light of this, EASA AD 2017-0066-E retained the 
requirements of EASA AD 2016-0240 and reduced the inspection threshold. 
Shortly after, EASA issued EASA AD 2017-0080, dated May 5, 2017 (EASA 
AD 2017-0080) to supersede EASA AD 2017-0066-E. EASA AD 2017-0080 was 
prompted by the determination that improved procedures to remove the 
horizontal stabilizer before cleaning and inspecting were necessary for 
certain helicopters. Accordingly, EASA AD 2017-0080 retained the 
requirements of EASA AD 2017-0066-E and added the improved procedures. 
Since EASA issued EASA AD 2017-0080, Airbus Helicopters developed MOD 
074775, which consists of the installation of four carbon patches at 
the junction frame. Installation of MOD 074775, either in production or 
by retrofit, constitutes terminating action for the repetitive 
inspections. Based on the latest information, EASA determined that 
continued inspections may not adequately address the long-term risk and 
requires modifying the affected helicopters, which also terminates the 
repetitive inspections of the pre-modified configuration. Accordingly, 
EASA issued EASA AD 2018-0104 to supersede EASA AD 2017-0080 to require 
installation of MOD 074775.

Discussion of Final Airworthiness Directive

Comments

    The FAA gave the public the opportunity to participate in 
developing this final rule, but the FAA did not receive any comments on 
the NPRM or on the determination of the cost to the public.

FAA's Determination

    These helicopters have been approved by EASA and are approved for 
operation in the United States. Pursuant to the FAA's bilateral 
agreement with the European Union, EASA has notified the FAA of the 
unsafe condition described in its AD. The FAA is issuing this AD after 
evaluating all of the information provided by EASA and determining the 
unsafe condition exists and is likely to exist or develop on other 
helicopters of these same type designs and that air safety and the 
public interest require adopting the AD requirements as proposed. 
Except for a minor editorial change of ``25 hours'' to ``25 hours TIS'' 
in Figure 1 to paragraph (f)(1) of this AD, this AD is adopted as 
proposed in the NPRM.

Differences Between This AD and the EASA AD

    EASA AD 2018-0104 does not apply to helicopters with MOD 074775, 
whereas this AD does. EASA AD 2018-0104 requires performing a local 
non-destructive inspection if in doubt about if there is a crack, 
whereas this AD does not. EASA AD 2018-0104 allows the pilot to 
visually inspect the junction frame from outside the tail boom for a 
crack, whereas this AD does not. EASA AD 2018-0104 requires contacting 
Airbus Helicopters if any crack is detected, whereas this AD requires 
replacing or repairing the junction frame in accordance with an FAA 
approved repair procedure instead. This AD requires a repetitive 
inspection for helicopters with MOD 074775 installed, whereas the EASA 
AD does not.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Airbus Helicopters Emergency Alert Service 
Bulletin No. 05A017, Revision 7, dated March 21, 2018, for Model EC130 
B4 and T2 helicopters without MOD 074775 installed. This service 
information specifies procedures for cleaning inside the junction 
frame, inspecting the junction frame from the inside of the tail boom 
with the horizontal stabilizer both removed and installed for a crack, 
and inspecting the junction frame from the outside of the tail boom for 
a crack.
    The FAA also reviewed Airbus Helicopters Service Bulletin No. 
EC130-53-036, Revision 4, dated April, 28, 2020, for Model EC130 B4 and 
T2 helicopters without MOD 074609 or 074775 installed and on which the 
skin

[[Page 22343]]

of the junction frame area has not been repaired. This service 
information specifies procedures to reinforce the junction frame (MOD 
074775) by replacing the two lateral splices which join the skins with 
four carbon patches (left-hand side, right-hand side, and lower sides).
    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.

Other Related Service Information

    The FAA reviewed Airbus Helicopters Service Bulletin No. EC130-53-
029, Revision 1, dated January 27, 2016. This service information 
specifies procedures to make a cut-out of the splice and skin at the 
junction frame (MOD 350A087421).
    The FAA reviewed Airbus EC 130 B4 Chapter 4, Airworthiness 
Limitations Section, Revision 11, dated January 19, 2019, and EC 130 T2 
Chapter 4, Airworthiness Limitations Section, Revision 9, dated 
September 9, 2019, which specify visually checking the junction frame 
for cracks at an interval of 600 flight hours with a margin of 60 
flight hours.
    The FAA also reviewed Airbus Helicopters Section 55-11-00, 6-4--
Horizontal Stabilizer--Inspection/Check, of Aircraft Maintenance Manual 
EC130, dated November 9, 2017, which specifies procedures for cleaning 
inside the junction frame and inspecting the junction frame from the 
inside of the tail boom with the horizontal stabilizer removed.

Costs of Compliance

    The FAA estimates that this AD affects 263 helicopters of U.S. 
Registry. Labor rates are estimated at $85 per work-hour. Based on 
these numbers, the FAA estimates that operators may incur the following 
costs in order to comply with this AD.
    Cleaning and inspecting the junction frame area with the horizontal 
stabilizer removed takes about 1 work-hour for an estimated cost of $85 
per helicopter and $22,355 for the U.S. fleet, per inspection cycle.
    Internally borescope inspecting the junction frame area with the 
horizontal stabilizer installed takes about 0.5 work-hour for an 
estimated cost of $43 per helicopter and $11,309 for the U.S. fleet, 
per inspection cycle.
    If applicable, cleaning and inspecting the junction frame area in 
each skin cut-out area takes about 1.25 work-hour for an estimated cost 
of $106 per helicopter and $27,878 for the U.S. fleet, per inspection 
cycle.
    Modifying the junction frame skin reinforcements takes about 90 
work-hours and parts cost about $10,000 for an estimated cost of 
$17,650 per helicopter and $4,641,950 for the U.S. fleet. Reporting 
certain information takes about 1 work-hour for an estimated cost of 
$85 per helicopter and $22,355 for the U.S. fleet. Inspecting the 
modified junction frame area takes about 1 work-hour for an estimated 
cost of $85 per helicopter and $22,355 for the U.S. fleet, per 
inspection cycle.
    If required, repairing or replacing the junction frame takes up to 
50 work-hours and parts cost about $60,000 for an estimated cost of 
$64,250 per helicopter.
    According to Airbus Helicopters' service information, some of the 
costs of this AD may be covered under warranty, thereby reducing the 
cost impact on affected individuals. The FAA does not control warranty 
coverage by Airbus Helicopters. Accordingly, all costs are included in 
the cost estimate.

Paperwork Reduction Act

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to a penalty for 
failure to comply with a collection of information subject to the 
requirements of the Paperwork Reduction Act unless that collection of 
information displays a currently valid OMB Control Number. The OMB 
Control Number for this information collection is 2120-0056. Public 
reporting for this collection of information is estimated to be 
approximately 1 hour per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, and completing and reviewing the 
collection of information. All responses to this collection of 
information are mandatory. Send comments regarding this burden estimate 
or any other aspect of this collection of information, including 
suggestions for reducing this burden to: Information Collection 
Clearance Officer, Federal Aviation Administration, 10101 Hillwood 
Parkway, Fort Worth, TX 76177-1524.

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.
    The FAA is 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

    The FAA has 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) Will not affect intrastate aviation in Alaska, and
    (3) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

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:
0
a. Removing Airworthiness Directive 2016-08-20, Amendment 39-18497 (81 
FR 26103, May 2, 2016); and
0
b. Adding the following new airworthiness directive:

2021-09-05 Airbus Helicopters: Amendment 39-21518; Docket No. FAA-
2020-1182; Product Identifier 2018-SW-036-AD.

(a) Applicability

    This airworthiness directive (AD) applies to Airbus Helicopters 
Model EC130B4 and EC130T2 helicopters, certificated in any

[[Page 22344]]

category, with a tail boom to Fenestron junction frame (junction 
frame).

(b) Unsafe Condition

    This AD defines the unsafe condition as a crack in the junction 
frame. This condition could result in failure of the junction frame, 
which could result in loss of the Fenestron and subsequent loss of 
control of the helicopter.

(c) Affected ADs

    This AD replaces AD 2016-08-20, Amendment 39-18497 (81 FR 26103, 
May 2, 2016).

(d) Effective Date

    This AD becomes effective June 2, 2021.

(e) Compliance

    You are responsible for performing each action required by this 
AD within the specified compliance time unless it has already been 
accomplished prior to that time.

(f) Required Actions

    (1) For helicopters without modification (MOD) 074775, or MOD AH 
350A087421 or SB EC130-53-029 installed, at the compliance time 
specified by the hours time-in-service (TIS) accumulated on the 
junction frame in Figure 1 to this paragraph, do the following:
[GRAPHIC] [TIFF OMITTED] TR28AP21.009

    (i) Remove the horizontal stabilizer; using a clean, lint-free, 
white cloth soaked with liquid Methyl Ethyl Ketone (MEK), clean the 
inside of the junction frame (a) as shown in Figure 1 of Airbus 
Helicopters Emergency Alert Service Bulletin No. 05A017, Revision 7, 
dated March 21, 2018 (EASB 05A017, Rev 7); and visually inspect for 
cracking around the circumference of the junction frame, in the web 
of the junction frame (a) and in the radius between the web and the 
flange of the tail boom side as shown in Figure 1 EASB 05A017, Rev 
7. Pay particular attention to the area around the 4 spars (b) as 
shown in Figure 1 of EASB 05A017, Rev 7. Examples of cracks are 
shown in Figure 3 of EASB 05A017, Rev 7. If there is a crack, before 
further flight, replace or repair the junction frame in accordance 
with an FAA approved repair procedure. Repairing or replacing the 
junction frame does not constitute terminating action for the 
requirements of this AD.
    (ii) Thereafter following paragraph (f)(1)(i) of this AD, within 
25 hours TIS or 390 sling cycles for helicopters that perform 
external load carrying operations, whichever occurs first, and 
thereafter at intervals not exceeding 25 hours TIS or 390 sling 
cycles, whichever occurs first, either perform the actions of 
paragraph (f)(1)(i) of this AD or, if the surface of the junction 
frame area is clean, use a borescope through the horizontal 
stabilizer opening to borescope inspect for a crack around the 
circumference of the junction frame, and in the web of the junction 
frame (a) and in the radius between the web and the flange on the 
tail boom side as shown in Figure 2 EASB 05A017, Rev 7. Pay 
particular attention to the area around the 4 spars (b) of Figure 2 
of EASB 05A017, Rev 7. Examples of cracks are shown in Figure 3 of 
EASB 05A017, Rev 7. For purposes of this AD, a sling cycle is 
defined as one landing with or without stopping the rotor or one 
external load-carrying operation; an external load-carrying 
operation occurs each time a helicopter picks up an external load 
and drops it off. If there is a crack, before further flight, 
replace or repair the junction frame in accordance with an FAA 
approved repair procedure. Repairing or replacing the junction frame 
does not constitute terminating action for the requirements of this 
AD.
    (iii) Thereafter following paragraph (f)(1)(i) of this AD, 
within 150 hours TIS and thereafter at intervals not to exceed 150 
hours TIS, accomplish the actions required by paragraph (f)(1)(i) of 
this AD. Accomplishment of this paragraph constitutes compliance for 
an instance of paragraph (f)(1)(ii) of this AD.
    (2) For helicopters without MOD 074775 installed, but with MOD 
AH 350A087421 or SB EC130-53-029 installed, before the junction 
frame accumulates 350 hours TIS or within 10 hours TIS, whichever 
occurs later:
    (i) Visually inspect for cracking on the junction frame (a) in 
the upper and lower right-hand side and upper and lower left-hand 
side areas of the skin cut-out as shown in Detail A, Figure 4 of 
EASB 05A017, Rev 7. If there is a crack, before further flight, 
replace or repair the junction frame in accordance with an FAA 
approved repair procedure. Repairing or replacing the junction frame 
does not constitute terminating action for the requirements of this 
AD.
    (ii) Thereafter following paragraph (f)(2)(i) of this AD, within 
10 hours TIS or 250 sling cycles for helicopters that perform 
external load carrying operations, whichever occurs first, and 
thereafter at intervals not exceeding 10 hours TIS or 250 sling 
cycles, whichever occurs first, accomplish the actions required by 
paragraph (f)(2)(i) of this AD.
    (iii) Thereafter following paragraph (f)(2)(i) of this AD, 
within 660 hours TIS and thereafter at intervals not to exceed 660 
hours TIS, accomplish the actions required by paragraph (f)(1)(i) of 
this AD. Accomplishment of this paragraph constitutes compliance for 
an instance of paragraph (f)(2)(ii) of this AD.
    (3) For helicopters without MOD 074775 installed, with or 
without MOD AH 350A087421 or SB EC130-53-029 installed, without MOD 
074609 or SB 53-024 installed, and on which the skin of the junction 
frame area has never been repaired, within 24 months as of the 
effective date of this AD, install MOD 074775 by following the 
Accomplishment Instructions, paragraphs 3.B.2.a. through g., of 
Airbus Helicopters Service Bulletin No. EC130-53-036, Revision 4, 
dated April, 28, 2020 (ASB EC130-53-036, Rev 4), except where ASB 
EC130-53-036, Rev. 4 specifies to certain discard parts, you are 
required to remove those parts from service instead and where ASB 
EC130-53-036, Rev 4. specifies contacting Airbus Helicopters for 
corrective action, the corrective action must be accomplished using 
a method approved by the FAA. Where ASB EC130-53-036, Rev 4, 
specifies completing the table in Appendix 4.H. under paragraph 
3.B.2.g., complete and return the table to Airbus Helicopters within 
30 days after installing MOD 074775. Installation of MOD 074775 
constitutes terminating action for the inspections required by 
paragraphs (f)(1) and (2) of this AD.
    (4) For helicopters without MOD 074775 installed, with MOD 
074609 or SB 53-024 installed, or on which the skin of the junction 
frame area has been previously repaired at any time, within 24 
months as of the effective date of this AD, reinforce the junction 
frame by replacing the two lateral splices which join the skins with 
four carbon

[[Page 22345]]

patches (left-hand side, right-hand side, and lower sides) in 
accordance with an FAA approved corrective procedure. Installation 
of this reinforcement constitutes terminating action for the 
inspections required by paragraphs (f)(1) and (2) of this AD.
    (5) For Model EC130B4 helicopters with MOD 074775 installed or 
with the reinforcement that is required by paragraph (f)(4) of this 
AD; and for Model EC130T2 helicopters with MOD 074775 installed or 
with the reinforcement that is required by paragraph (f)(4) of this 
AD, but without MOD 074581 installed:
    (i) Within 600 hours TIS after the installation of MOD 074775 or 
the reinforcement that is required by paragraph (f)(4) of this AD, 
and thereafter at intervals not exceeding 600 hours TIS, perform the 
actions of paragraph (f)(1)(i) of this AD.
    (ii) If there is a crack, before further flight, replace or 
repair the junction frame in accordance with an FAA approved repair 
procedure. Repairing the junction frame does not constitute 
terminating action for the requirements of this AD.

(g) Special Flight Permits

    Special flight permits are prohibited.

(h) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, International Validation 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 Validation Branch, send 
it to the attention of the person identified in paragraph (i)(1) of 
this AD. Information may be emailed to: [email protected].
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.

(i) Related Information

    (1) For more information about this AD, contact Kristi Bradley, 
Aerospace Engineer, General Aviation & Rotorcraft Section, 
International Validation Branch, Compliance & Airworthiness 
Division, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 
(817) 222-5110; email [email protected].
    (2) Airbus Helicopters Service Bulletin No. EC130-53-029, 
Revision 1, dated January 27, 2016, Airbus EC 130 B4 Chapter 4, 
Airworthiness Limitations Section, Revision 11, dated January 19, 
2019, Airbus EC 130 T2 Chapter 4, Airworthiness Limitations Section, 
Revision 9, dated September 9, 2019, and Section 55-11-00, 6-4--
Horizontal Stabilizer--Inspection/Check, of Aircraft Maintenance 
Manual EC130, dated November 9, 2017, which are not incorporated by 
reference, contain additional information about the subject of this 
AD. This service information is available at the contact information 
specified in paragraphs (k)(3) and (4) of this AD.
    (3) The subject of this AD is addressed in European Aviation 
Safety Agency (now European Union Aviation Safety Agency) (EASA) 
2018-0104, dated May 4, 2018. You may view the EASA AD on the 
internet at https://www.regulations.gov in Docket No. FAA-2020-1182.

(j) Subject

    Joint Aircraft Service Component (JASC) Code: 5302, Rotorcraft 
Tail Boom.

(k) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference 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 the AD specifies otherwise.
    (i) Airbus Helicopters Emergency Alert Service Bulletin No. 
05A017, Revision 7, dated March 21, 2018.
    (ii) Airbus Helicopters Service Bulletin No. EC130-53-036, 
Revision 4, dated April, 28, 2020.
    (3) For service information identified in this AD, contact 
Airbus Helicopters, 2701 N. Forum Drive, Grand Prairie, TX 75052; 
telephone (972) 641-0000 or (800) 232-0323; fax (972) 641-3775; or 
at https://www.airbus.com/helicopters/services/technical-support.html.
    (4) You may view this service information at FAA, Office of the 
Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N-
321, Fort Worth, TX 76177. For information on the availability of 
this material at the FAA, call (817) 222-5110.
    (5) 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, email [email protected], or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on April 14, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2021-08781 Filed 4-27-21; 8:45 am]
BILLING CODE 4910-13-P