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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2021-0832; Project Identifier MCAI-2020-01550-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    November 12, 2021.

(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  9001
    through 9879 inclusive, 9998, and 60001 through 60033 inclusive.

(d) SUBJECT

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

(e) REASON

    This AD was prompted was prompted by reports of internal corrosion  on
    the  inboard  flaps  found prior  to  regularly  scheduled maintenance
    checks. The FAA  is issuing this  AD to address  internal corrosion on
    the inboard flaps, which could result in reduced structural integrity,
    detachment of the flap, and consequent reduced controllability of  the
    airplane.

(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  include
    the information specified in Task 57-51-00-290-801, "Special  Detailed
    Inspection  of  the  Inboard-Flap Internal  Ribs,"  of  the applicable
    Bombardier Aircraft Maintenance Manual (AMM) identified in figure 1 to
    paragraph (g) of this AD and to include the following compliance times
    for Task 57-51-00-290-801: Within  60 months after the  effective date
    of this AD (for the initial compliance time), and repeat thereafter at
    intervals not to exceed 60 months.
    ______________________________________________________________________
     AIRPLANE MODEL                   BOMBARDIER AMM                      
    ______________________________________________________________________
     BD-700-lAl0     Bombardier Global Express Aircraft Maintenance Manual
                     - Part Two - Publication No. BD-700 AMM, Revision 90,
                     dated May 19, 2021
     BD-700-lAl0     Bombardier Global Express XRS Aircraft Maintenance
                     Manual - Part Two - Publication No. BD-700 XRS AMM,
                     Revision 68, dated May 19, 2021
     BD-700-lAl0     Bombardier Global 6000 Aircraft Maintenance Manual -
                     Part Two - Publication No. GL 6000 AMM, Revision 39,
                     dated May 19, 2021
     BD-700-lAl0     Bombardier Global 6500 Aircraft Maintenance Manual -
                     Part Two - Publication No. GL 6500 AMM, Revision 8,
                     dated May 19, 2021
     BD-700-lAl 1    Bombardier Global 5000 Aircraft Maintenance Manual -
                     Part Two - Publication No. BD-700 AMM, Revision 71,
                     dated May 19, 2021
     BD-700-lAl 1    Bombardier Global 5000 Featuring Global Vision Flight
                     Deck Aircraft Maintenance Manual - Part Two - Publi-
                     cation No. GL 5000 GVFD AMM, Revision 38, dated
                     May 19, 2021
     BD-700-lAl 1    Bombardier Global 5500 Aircraft Maintenance Manual -
                     Part Two - Publication No. GL 5500 AMM, Revision 7,
                     dated May 19, 2021
    ______________________________________________________________________
               FIGURE 1 TO PARAGRAPH (G) - APPLICABLE AMMS                
    ______________________________________________________________________

(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
    local Flight  Standards District  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  local  flight  standards
    district office/certificate holding district 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-2020-49R1, dated May 20,  2021, for related information.  This MCAI
    may  be  found  in the  AD  docket  at https://www.regulations.gov  by
    searching for and locating Docket No. FAA-2021-0832.

(2) For more  information  about this AD, contact  Antariksh Shetty, Aero-
    space Engineer,  Airframe and  Propulsion Section,  FAA, New  York ACO
    Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;  telephone
    516-228-7300; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

(3) For  service information  identified in  this AD,  contact Bombardier,
    Inc., 200 C[ocirc]te-Vertu Road West, Dorval, Quebec H4S 2A3,  Canada;
    telephone  514-855-2999;  email  ac.yul@aero.bombardier.com;  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.

Issued on September  21, 2021. Gaetano  A. Sciortino, Deputy  Director for
Strategic  Initiatives,  Compliance  &  Airworthiness  Division,  Aircraft
Certification Service.

DATES: The FAA must receive comments  on this proposed AD by November  12,
2021.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0832; Project Identifier MCAI-2020-01550-T]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11
airplanes. This proposed AD was prompted by reports of internal
corrosion on the inboard flaps found prior to regularly scheduled
maintenance checks. This proposed AD would require revising the
existing maintenance or inspection program, as applicable, to
incorporate a certain aircraft maintenance manual (AMM) task. The FAA
is proposing this AD to address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by November
12, 2021.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:

Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow
the instructions for submitting comments.

Fax: 202-493-2251.

Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building, Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.

Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

For service information identified in this NPRM, contact
Bombardier, Inc., Bombardier, Inc., 200 C[ocirc]te-Vertu Road West,
Dorval, Qu[eacute]bec H4S 2A3, Canada; telephone 514-855-2999; email
ac.yul@aero.bombardier.com; 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.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0832; 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 NPRM, any comments
received, and other information. The street address for Docket
Operations is listed above. Comments will be available in the AD docket
shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Antariksh Shetty, Aerospace Engineer,
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-
794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under ADDRESSES. Include "Docket No. FAA-2021-0832; Project Identifier
MCAI-2020-01550-T" at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
the proposal because of those comments.

Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
https://www.regulations.gov, including any personal information you
provide. The agency will also post a report summarizing each
substantive verbal contact received about this proposed AD.

Confidential Business Information

CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as "PROPIN." The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to
Antariksh Shetty, Aerospace Engineer, Airframe and Propulsion Section,
FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 516-228-7300; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

Any commentary that the FAA receives which is not specifically designated as CBI
will be placed in the public docket for this rulemaking.

Background

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2020-49R1, dated May 20,
2021 (TCCA AD CF-2020-49R1) (also referred to after this 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 at https://www.regulations.gov by searching for and locating
Docket No. FAA-2021-0832.

This proposed AD was prompted by reports of internal corrosion on
the inboard flaps found prior to regularly scheduled maintenance
checks. The FAA is proposing this AD to address such corrosion, which
could result in reduced structural integrity, detachment of the flap,
and consequent reduced controllability of the airplane.

See the MCAI for additional background information.

Related Service Information Under 1 CFR Part 51

Bombardier issued the following service information.
Task 57-51-00-290-801, "Special Detailed Inspection of
the Inboard-Flap Internal Ribs," of Bombardier Global Express Aircraft
Maintenance Manual--Part Two--Publication No. BD-700 AMM, Revision 90,
dated May 19, 2021.

Task 57-51-00-290-801, "Special Detailed Inspection of
the Inboard-Flap Internal Ribs," of Bombardier Global Express XRS
Aircraft Maintenance Manual--Part Two--Publication No. BD-700 XRS AMM,
Revision 68, dated May 19, 2021.

Task 57-51-00-290-801, "Special Detailed Inspection of
the Inboard-Flap Internal Ribs," of Bombardier Global 6000 Aircraft
Maintenance Manual--Part Two--Publication No. GL 6000 AMM, Revision 39,
dated May 19, 2021.

Task 57-51-00-290-801, "Special Detailed Inspection of
the Inboard-Flap Internal Ribs," of Bombardier Global 6500 Aircraft
Maintenance Manual--Part Two--Publication No. GL 6500 AMM, Revision 8,
dated May 19, 2021.

Task 57-51-00-290-801, "Special Detailed Inspection of
the Inboard-Flap Internal Ribs," of Bombardier Global 5000 Aircraft
Maintenance Manual--Part Two--Publication No. BD-700 AMM, Revision 71,
dated May 19, 2021.

Task 57-51-00-290-801, "Special Detailed Inspection of
the Inboard-Flap Internal Ribs," of Bombardier Global 5000 Featuring
Global Vision Flight Deck Aircraft Maintenance Manual--Part Two--
Publication No. GL 5000 GVFD AMM, Revision 38, dated May 19, 2021.

Task 57-51-00-290-801, "Special Detailed Inspection of
the Inboard-Flap Internal Ribs," of Bombardier Global 5500 Aircraft
Maintenance Manual--Part Two--Publication No. GL 5500 AMM, Revision 7,
dated May 19, 2021.

These documents describe amendments to the AMM to include
inspections of the inboard flap internal ribs for corrosion. 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.

FAA's Determination

This product has been approved by the aviation authority of another
country, and is approved for operation in the United States. Pursuant
to the FAA's bilateral agreement with the State of Design Authority,
the FAA has been notified of the unsafe condition described in the MCAI
and service information referenced above. The FAA is proposing this AD
because the FAA evaluated all the relevant information and determined
the unsafe condition described previously is likely to exist or develop
on other products of the same type design.

Proposed Requirements of This NPRM

This proposed AD would require revising the existing maintenance or
inspection program, as applicable, to incorporate the information
specified in AMM Task 57-51-00-290-801 and the compliance times for AMM
Task 57-51-00-290-801.

The AMM task corresponds to Part 3, Task 57-51-00-201, Special
Detailed Inspection of the Inboard-Flap Internal Ribs, of the
applicable Bombardier Time Limits/Maintenance Checks (TLMC), which is
referenced in the MCAI.

Costs of Compliance

The FAA estimates that this proposed AD affects 141 airplanes of
U.S. registry. The FAA estimates the following costs to comply with
this proposed 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 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


The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not
have a substantial direct effect on the States, on the relationship
between the national Government and the States, or on the distribution
of power and responsibilities among the various levels of government.

For the reasons discussed above, I certify this proposed regulation:

(1) Is not a "significant regulatory action" under Executive Order 12866,

(2) Would not affect intrastate aviation in Alaska, and

(3) Would not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39


Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Proposed Amendment


Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES


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]


2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive: