[Federal Register Volume 86, Number 210 (Wednesday, November 3, 2021)]
[Rules and Regulations]
[Pages 60554-60557]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-23869]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0560; Project Identifier MCAI-2021-00192-T; 
Amendment 39-21764; AD 2021-21-04]
RIN 2120-AA64


Airworthiness Directives; Bombardier, Inc., Airplanes

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

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. 
This AD was prompted by reports that the sliding bushings in the 
forward engine mount system were missing. This AD requires an 
inspection (gap check) of the front and aft engine mounts to verify the 
proper installation of the sliding bushings, and repair if necessary. 
The FAA is issuing this AD to address the unsafe condition on these 
products.

DATES: This AD is effective December 8, 2021.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of December 8, 
2021.

ADDRESSES: For service information identified in this final rule, 
contact Bombardier, Inc., 200 C[ocirc]te-Vertu Road West, Dorval, 
Qu[eacute]bec H4S 2A3, Canada; telephone 514-855-2999; email 
[email protected]; internet https://www.bombardier.com. You 
may view this service information at the FAA, Airworthiness Products 
Section, Operational Safety Branch, 2200 South 216th St., Des Moines, 
WA. For information on the availability of this material at the FAA, 
call 206-231-3195. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-
0560.

Examining the AD Docket

    You may examine the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-
0560; 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 final rule, any comments received, and other information. The 
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: Elizabeth Dowling, Aerospace Engineer, 
Mechanical Systems and Administrative Services Section, FAA, New York 
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 516-228-7300; fax 516-794-5531; email [email protected].

SUPPLEMENTARY INFORMATION:

Background

    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued TCCA AD CF-2021-04, dated February 15, 
2021 (also referred to as the Mandatory Continuing Airworthiness 
Information, or the MCAI), to correct an unsafe condition for certain 
Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. You may 
examine the MCAI in the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-
0560.
    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 by adding an AD that would apply to certain Bombardier, 
Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. The NPRM published 
in the Federal Register on July 9, 2021 (86 FR 36243). The NPRM was 
prompted by reports that the sliding bushings in the forward engine 
mount system were missing. The NPRM proposed to require an inspection 
(gap check) of the front and aft engine mounts to verify the proper 
installation of the sliding bushings, and repair if necessary. The FAA 
is issuing this AD to address redistribution of load/stress on the 
mount components, which may decrease the component fatigue life; 
failure of the mount structural components could result in the loss of 
the engine attachment to the airframe. See the MCAI for additional 
background information.

Comments

    The FAA gave the public the opportunity to participate in 
developing this final rule. The following presents the comment received 
on the NPRM and the FAA's response to the comment.

Request To Update Certain Service Information and Provide Credit for 
Actions Accomplished Using Previous Service Information

    Bombardier, Inc., stated that Bombardier Service Bulletin 700-71-
005, dated December 14, 2020, has been updated to Bombardier Service 
Bulletin 700-71-005, Revision 01, dated April

[[Page 60555]]

16, 2021. Bombardier, Inc., commented that the revised service 
information provides a clarification specifically for a German 
registered airplane having a serial number with a specific 
configuration from a previous repair; no other changes were made 
between revision levels. Bombardier, Inc., requested that, if 
Bombardier Service Bulletin 700-71-005, Revision 01, dated April 16, 
2021, is referenced, credit be provided for operators that have 
previously completed the applicable actions using Bombardier Service 
Bulletin 700-71-005, dated December 14, 2020.
    The FAA agrees to update this final rule to reference Bombardier 
Service Bulletin 700-71-005, Revision 01, dated April 16, 2021, for the 
reasons provided above; the technical content and the intent of the 
service information remains unchanged. The FAA has also added paragraph 
(i) of this AD to provide credit for Bombardier Service Bulletin 700-
71-005, dated December 14, 2020, for previous actions that were 
performed before the effective date of this AD. In addition, subsequent 
paragraphs have been re-identified accordingly.

Conclusion

    The FAA reviewed the relevant data, considered the comment 
received, and determined that air safety and the public interest 
require adopting this final rule with the change described previously 
and minor editorial changes. The FAA has determined that these minor 
changes:
     Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.
    The FAA also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this final 
rule.

Related Service Information Under 1 CFR Part 51

    Bombardier, Inc., has issued the following service information.
     Bombardier Service Bulletin 700-1A11-71-005, dated 
December 14, 2020.
     Bombardier Service Bulletin 700-71-005, Revision 01, dated 
April 16, 2021.
     Bombardier Service Bulletin 700-71-5005, dated December 
14, 2020.
     Bombardier Service Bulletin 700-71-5501, dated December 
14, 2020.
     Bombardier Service Bulletin 700-71-6005, dated December 
14, 2020.
     Bombardier Service Bulletin 700-71-6501, dated December 
14, 2020.
    This service information describes procedures for verifying the 
proper installation of the sliding bushings by doing an inspection (gap 
check), including a gap outside acceptable limits, a missing or damaged 
nut or bolt at the upper side of front mount beam, and a bolt that 
turns freely with finger pressure. These documents are distinct since 
they apply to different airplane serial numbers. 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

    The FAA estimates that this AD affects 376 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
                          Labor cost                              Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
11 work-hours x $85 per hour = $935..........................              $0             $935         $351,560
----------------------------------------------------------------------------------------------------------------

    The FAA has received no definitive data on which to base the cost 
estimates for the repairs specified in this AD.
    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some or all of the costs of 
this AD may be covered under warranty, thereby reducing the cost impact 
on affected operators.

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

    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 adding the following new airworthiness 
directive:

2021-21-04 Bombardier, Inc.: Amendment 39-21764; Docket No. FAA-
2021-0560; Project Identifier MCAI-2021-00192-T.

(a) Effective Date

    This airworthiness directive (AD) is effective December 8, 2021.

[[Page 60556]]

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-
700-1A11 airplanes, certificated in any category, serial numbers 
9002 through 9879 inclusive, 9998, 60001 through 60005 inclusive, 
60007, 60009, 60015, 60016, and 60024.

(d) Subject

    Air Transport Association (ATA) of America Code 71, Powerplant.

(e) Unsafe Condition

    This AD was prompted by reports that the sliding bushings in the 
forward engine mount system were missing. The FAA is issuing this AD 
to address redistribution of load/stress on the mount components, 
which may decrease the component fatigue life; failure of the mount 
structural components could result in the loss of the engine 
attachment to the airframe.

(f) Compliance

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

(g) Inspection and Corrective Action

    Within 15 months or 750 flight hours, whichever occurs first, 
after the effective date of this AD: Verify the proper installation 
of the sliding bushings by doing an inspection (gap check) for 
discrepancies of the front and aft engine mounts, in accordance with 
paragraphs 2.B. through 2.F. of the Accomplishment Instructions of 
the applicable service information specified in figure 1 to 
paragraph (g) of this AD. If any discrepancy is found: Before 
further flight, repair using a method approved by the Manager, New 
York ACO Branch, FAA; or Transport Canada Civil Aviation (TCCA); or 
Bombardier, Inc.'s TCCA Design Approval Organization (DAO). If 
approved by the DAO, the approval must include the DAO-authorized 
signature. Where a serial number is identified in more than one row 
in figure 1 to paragraph (g) of this AD, the applicable service 
information is identified based on the marketing designations in 
paragraph 1.M., ``Equivalent Service Bulletins,'' of the service 
information.
[GRAPHIC] [TIFF OMITTED] TR03NO21.001

(h) No Reporting Requirement

    Although the service information identified in table 1 to 
paragraph (g) of this AD specifies to submit certain information to 
the manufacturer, this AD does not include that requirement.

(i) Credit for Previous Actions

    This paragraph provides credit for actions required by paragraph 
(g) of this AD, if those actions were performed before the effective 
date of this AD using Bombardier Service Bulletin 700-71-005, dated 
December 14, 2020.

(j) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York ACO 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 responsible Flight Standards Office, as appropriate. If 
sending information directly to the manager of the certification 
office, send it to ATTN: Program Manager, Continuing Operational 
Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531. Before 
using any approved AMOC, notify your appropriate principal 
inspector, or lacking a principal inspector, the manager of the 
responsible Flight Standards Office.
    (2) Contacting the Manufacturer: For any requirement in this AD 
to obtain instructions from a manufacturer, the instructions must be 
accomplished using a method approved by the Manager, New York ACO 
Branch, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO. If approved by 
the DAO, the approval must include the DAO-authorized signature.

(k) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) TCCA AD

[[Page 60557]]

CF-2021-04, dated February 15, 2021, for related information. This 
MCAI may be found in the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-
2021-0560.
    (2) For more information about this AD, contact Elizabeth 
Dowling, Aerospace Engineer, Mechanical Systems and Administrative 
Services Section, FAA, New York ACO Branch, 1600 Stewart Avenue, 
Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-794-
5531; email [email protected].

(l) 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.
    (i) Bombardier Service Bulletin 700-1A11-71-005, dated December 
14, 2020.
    (ii) Bombardier Service Bulletin 700-71-005, Revision 01, dated 
April 16, 2021.
    (iii) Bombardier Service Bulletin 700-71-5005, dated December 
14, 2020.
    (iv) Bombardier Service Bulletin 700-71-5501, dated December 14, 
2020.
    (v) Bombardier Service Bulletin 700-71-6005, dated December 14, 
2020.
    (vi) Bombardier Service Bulletin 700-71-6501, dated December 14, 
2020.
    (3) For service information identified in this AD, contact 
Bombardier, Inc., 200 C[ocirc]te-Vertu Road West, Dorval, 
Qu[eacute]bec H4S 2A3, Canada; telephone 514-855-2999; email 
[email protected]; internet https://www.bombardier.com.
    (4) You may view this service information at the FAA, 
Airworthiness Products Section, Operational Safety Branch, 2200 
South 216th St., Des Moines, WA. For information on the availability 
of this material at the FAA, call 206-231-3195.
    (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 September 30, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2021-23869 Filed 11-2-21; 8:45 am]
BILLING CODE 4910-13-P