[Federal Register Volume 86, Number 148 (Thursday, August 5, 2021)]
[Rules and Regulations]
[Pages 42701-42704]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-16565]



[[Page 42701]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-1181; Project Identifier MCAI-2020-01368-T; 
Amendment 39-21617; AD 2021-13-12]
RIN 2120-AA64


Airworthiness Directives; Bombardier, Inc., Airplanes

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

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all 
Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-
600-2B16 (601-3A, 601-3R and 604 Variants) airplanes. This AD was 
prompted by reports of corrosion on the passenger door internal 
structure of in-service airplanes. This AD requires revising the 
existing maintenance or inspection program, as applicable, to 
incorporate new or more restrictive airworthiness limitations. The FAA 
is issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective September 9, 2021.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of September 9, 
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; North America toll-free telephone 1-866-
538-1247 or direct-dial telephone 1-514-855-2999; email 
<a href="/cdn-cgi/l/email-protection#3455571a4d4158745551465b1a565b59565546505d51461a575b59"><span class="__cf_email__" data-cfemail="f8999bd6818d94b8999d8a97d69a97959a998a9c919d8ad69b9795">[email protected]</span></a>; 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-2020-
1181.

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-2020-
1181; 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: Aziz Ahmed, Aerospace Engineer, 
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart 
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7329; fax 516-
794-5531; email <a href="/cdn-cgi/l/email-protection#4d74602c3b3e6023342c2e22602e223e0d2b2c2c632a223b"><span class="__cf_email__" data-cfemail="291004485f5a044750484a46044a465a694f4848074e465f">[email protected]</span></a>.

SUPPLEMENTARY INFORMATION: 

Background

    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued TCCA AD CF-2016-37, dated November 25, 
2016 (also referred to as the Mandatory Continuing Airworthiness 
Information, or the MCAI), to correct an unsafe condition for all 
Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-
600-2B16 (601-3A, 601-3R, and 604 Variants) 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-2020-
1181.
    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 by adding an AD that would apply to all Bombardier, Inc., 
Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-600-2B16 (601-3A, 
601-3R and 604 Variants) airplanes. The NPRM published in the Federal 
Register on March 17, 2021 (86 FR 14551). The NPRM was prompted by 
reports of corrosion on the passenger door internal structure of in-
service airplanes caused by an accumulation of moisture under the epoxy 
ramp. The NPRM proposed to require revising the existing maintenance or 
inspection program, as applicable, to incorporate new or more 
restrictive airworthiness limitations. The FAA is issuing this AD to 
address corrosion on the passenger door internal structure and 
consequent loss of the structural integrity of the forward passenger 
door. See the MCAI for additional background information.

Comments

    The FAA gave the public the opportunity to participate in 
developing this final rule. The FAA received no comments on the NPRM or 
on the determination of the cost to the public.

Conclusion

    The FAA reviewed the relevant data and determined that air safety 
and the public interest require adopting this final rule as proposed, 
except for minor editorial changes. The FAA has determined that these 
minor changes:
    <bullet> Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
    <bullet> Do not add any additional burden upon the public than was 
already proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed the following Bombardier service information, 
which describes new or more restrictive airworthiness limitations for 
the upper latch pins of the forward passenger door. These documents are 
distinct since they apply to different airplane configurations. (Note: 
The asterisk (or ``one star'') with the last three digits of the task 
number indicates that the task is an airworthiness limitation task.)
    <bullet> Task 53-10-01-101 *, ``Upper Latch Pins of the Passenger 
Door,'' of Bombardier Challenger CL-600-1A11 Time Limits/Maintenance 
Checks (TLMC), Product Support Publication (PSP) 605, Revision 39, 
dated January 8, 2018.
    <bullet> Task 53-10-01-101 *, ``Upper Latch Pins of the Passenger 
Door,'' of Bombardier Challenger CL-600-2A12 TLMC, PSP 601-5, Revision 
46, dated January 8, 2018.
    <bullet> Task 53-10-01-101 *, ``Upper Latch Pins of the Passenger 
Door,'' of Bombardier Challenger CL-600-2B16 TLMC, PSP 601A-5, Revision 
42, dated January 8, 2018.
    <bullet> Task 53-20-00-188 *, ``Special Detailed Inspection of the 
Upper Latch Pins of the Passenger Door,'' of Bombardier Challenger 
TLMC, CH 604 TLMC, Revision 32, dated December 18, 2019.
    <bullet> Task 53-20-00-188 *, ``Special Detailed Inspection of the 
Upper Latch Pins of the Passenger Door,'' of Bombardier Challenger 
TLMC, CH 605 TLMC, Revision 21, dated December 18, 2019.
    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 133 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD:
    The FAA has determined that revising the maintenance or inspection 
program takes an average of 90 work-hours per operator, although the 
agency recognizes that this number may vary from operator to operator. 
Since

[[Page 42702]]

operators incorporate maintenance or inspection program changes for 
their affected fleet(s), the FAA has determined that a per-operator 
estimate is more accurate than a per-airplane estimate. Therefore, the 
agency estimates the average total cost per operator to be $7,650 (90 
work-hours x $85 per work-hour).

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:

2021-13-12 Bombardier, Inc.: Amendment 39-21617; Docket No. FAA-
2020-1181; Project Identifier MCAI-2020-01368-T.

(a) Effective Date

    This airworthiness directive (AD) is effective September 9, 
2021.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all Bombardier, Inc., Model CL-600-1A11 
(600), CL-600-2A12 (601), and CL-600-2B16 (601-3A, 601-3R, and 604 
Variants) airplanes, certificated in any category.

(d) Subject

    Air Transport Association (ATA) of America Code 05, Time Limits/
Maintenance Checks.

(e) Reason

    This AD was prompted by reports of corrosion on the passenger 
door internal structure of in-service airplanes. This AD was further 
prompted by a determination that new or more restrictive 
airworthiness limitations are necessary. The FAA is issuing this AD 
to address corrosion on the passenger door internal structure and 
consequent loss of the structural integrity of the forward passenger 
door.

(f) Compliance

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

(g) Maintenance or Inspection Program Revision

    Within 30 days after the effective date of this AD: Revise the 
existing maintenance or inspection program, as applicable, to 
incorporate the information specified in the applicable time limits/
maintenance checks (TLMC) revision specified in figure 1 to 
paragraph (g) of this AD. The initial compliance time for doing the 
tasks is at the time specified in the TLMC, or within 30 days after 
the effective date of this AD, whichever occurs later.
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(h) No Alternative Actions or Intervals

    After the existing maintenance or inspection program has been 
revised as required by paragraph (g) of this AD, no alternative 
actions (e.g., inspections) or intervals may be used unless the 
actions or intervals are approved as an alternative method of 
compliance (AMOC) in accordance with the procedures specified in 
paragraph (i)(1) of this AD.

(i) 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 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.

(j) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) TCCA AD CF-2016-37, dated November 25, 2016, 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-2020-1181.
    (2) For more information about this AD, contact Aziz Ahmed, 
Aerospace Engineer, Airframe and Propulsion Section, FAA, New York 
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 516-228-7329; fax 516-794-5531; email <a href="/cdn-cgi/l/email-protection#162f3b7760653b786f7775793b7579655670777738717960"><span class="__cf_email__" data-cfemail="e0d9cd819693cd8e9981838fcd838f93a0868181ce878f96">[email protected]</span></a>.

(k) 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) Task 53-10-01-101 *, ``Upper Latch Pins of the Passenger 
Door,'' of Bombardier Challenger CL-600-1A11 Time Limits/Maintenance 
Checks (TLMC), Product Support Publication (PSP) 605, Revision 39, 
dated January 8, 2018.
    (ii) Task 53-10-01-101 *, ``Upper Latch Pins of the Passenger 
Door,'' of Bombardier Challenger CL-600-2A12 TLMC, PSP 601-5, 
Revision 46, dated January 8, 2018.
    (iii) Task 53-10-01-101 *, ``Upper Latch Pins of the Passenger 
Door,'' of Bombardier Challenger CL-600-2B16 TLMC, PSP 601A-5, 
Revision 42, dated January 8, 2018.
    (iv) Task 53-20-00-188 *, ``Special Detailed Inspection of the 
Upper Latch Pins

[[Page 42704]]

of the Passenger Door,'' of Bombardier Challenger TLMC, CH 604 TLMC, 
Revision 32, dated December 18, 2019.
    (v) Task 53-20-00-188 *, ``Special Detailed Inspection of the 
Upper Latch Pins of the Passenger Door,'' of Bombardier Challenger 
TLMC, CH 605 TLMC, Revision 21, dated December 18, 2019.
    (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; North America toll-free telephone 1-
866-538-1247 or direct-dial telephone 1-514-855-2999; email 
<a href="/cdn-cgi/l/email-protection#ee8f8dc0979b82ae8f8b9c81c08c81838c8f9c8a878b9cc08d8183"><span class="__cf_email__" data-cfemail="7c1d1f520509103c1d190e13521e13111e1d0e1815190e521f1311">[email protected]</span></a>; 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 <a href="/cdn-cgi/l/email-protection#335556574156541d5f5654525f735d5241521d545c45"><span class="__cf_email__" data-cfemail="b8dedddccadddf96d4dddfd9d4f8d6d9cad996dfd7ce">[email protected]</span></a>, or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on June 16, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2021-16565 Filed 8-4-21; 8:45 am]
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