DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-0684; Project Identifier MCAI-2021-01204-T]
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
for certain Bombardier, Inc., Model BD-700-2A12 airplanes. This
proposed AD was prompted by a report of a lateral offset observed on
the head-up display (HUD) of several airplanes between the synthetic
vision system (SVS) and actual runway due to mechanical misalignment of
the HUD during manufacturing and assembly. This proposed AD would
require revising the existing Airplane Flight Manual (AFM) to prohibit
steep approach landing (SAL) and enhanced flight vision system (EFVS)
operations. This proposed AD would also require calibrating the HUD.
The FAA is proposing this AD to address the unsafe condition on these
DATES: The FAA must receive comments on this proposed AD by August
ADDRESSES: You may send comments, using the procedures found in
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow
instructions for submitting comments.
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
Business Aircraft Customer Response Center, 400 Cote-Vertu Road
West, Dorval, Quebec H4S 1Y9, Canada; telephone 1-514-855-2999;
email firstname.lastname@example.org; 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-2022-0684; 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.
FOR FURTHER INFORMATION CONTACT: Thomas Niczky, Aerospace Engineer,
Airframe and Mechanical Systems Section, FAA, New York ACO Branch, 1600
Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7347;
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-2022-0684; Project Identifier
MCAI-2021-01204-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 NPRM.
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
Thomas Niczky, Aerospace Engineer, Airframe and Mechanical Systems
Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone 516-228-7347; email email@example.com.
Any commentary that the FAA receives that is not
specifically designated as CBI will be placed in the public docket for
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2021-36, dated November 1,
2021 (TCCA AD CF-2021-36) (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-700-2A12
airplanes. You may examine the MCAI in the AD docket at https://www.
regulations.gov by searching for and locating Docket No. FAA-2022-0684.
This proposed AD was prompted by a report indicating that during
production, a lateral offset was observed on the HUD of several
airplanes between the SVS and actual runway. An investigation
determined the cause of the offset to be mechanical misalignment of the
HUD during manufacturing and assembly. The FAA is proposing this AD to
address a lateral offset between SVS and actual runway, which could
create an incorrect aircraft reference display on the HUD and lead to
excessive deviation during landing, particularly affecting SAL or EFVS
operations. See the MCAI for additional background information.
Related Service Information Under 1 CFR Part 51
Bombardier has issued the following documents to prohibit SAL and
EFVS operations until the HUD has been calibrated.
Section 6., Service Bulletins, of Chapter 1--Introduction,
of the Bombardier Global 7500 AFM, Publication No. CSP 700-7000-1,
Revision 14, dated October 21, 2021.
Supplement 7--Enhanced Flight Vision System (EFVS)
Operations, of Chapter 7--Supplements, of the Bombardier Global 7500
AFM, Publication No. CSP 700-7000-1, Revision 14, dated October 21,
Supplement 20--Steep Approaches with Published Glidepath
Angles from 4.5 to 5.5 Degrees, of Chapter 7--Supplements, of the
Bombardier Global 7500 AFM, Publication No. CSP 700-7000-1, Revision
14, dated October 21, 2021.
(For obtaining this material in the Bombardier Global 7500 AFM,
Publication No. CSP 700-7000-1, use Document Identification No. GL 7500
Bombardier has issued the following documents, which specify
procedures for calibrating the HUD (and second HUD if installed). The
procedures include an inspection of the HUD mounting brackets and sill
beams for damage and contamination (e.g., drill shavings and adhesive)
of the mating surfaces and injection holes, an inspection for voids in
the structural adhesive, and applicable corrective actions. Corrective
actions include replacing damaged brackets and backfilling voids with
structural adhesive. These documents are distinct since they apply to
different airplane configurations.
Bombardier Service Bulletin 700-34-7521, Revision 03,
dated July 27, 2021.
Bombardier Service Bulletin 700-34-7521, Revision 04,
dated December 6, 2021, including Appendix 1, dated November 10, 2021.
Bombardier Service Bulletin 700-34-7523, Revision 01,
dated December 8, 2021.
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
Earlier revisions of Service Bulletins 700-34-7521 and 700-34-7523
included a typographical error on the metric values on the ``External
Target Board'' table. This error was corrected in Bombardier Service
Bulletin 700-34-7521, Revision 03, dated July 27, 2021; Bombardier
Service Bulletin 700-34-7521, Revision 04, dated December 6, 2021,
including Appendix 1, dated November 10, 2021; and Bombardier Service
Bulletin 700-34-7523, Revision 01, dated December 8, 2021. This error
is further described in the Retroactive Action section in these Service
Bulletins. The FAA has determined that the earlier revisions would be
acceptable for compliance with the proposed requirements under certain
conditions in their entirety if imperial values were used. However, if
the metric values specified in the earlier revisions were used, the HUD
calibration is not considered completed for the purposes of Supplement
7--Enhanced Flight Vision System (EFVS) Operations, and Supplement 20--
Steep Approaches with Published Glidepath Angles from 4.5 to 5.5
Degrees, of Chapter 7--Supplements, of the Bombardier Global 7500 AFM,
Publication No. CSP 700-7000-1, until retroactive actions are also done
as specified in paragraphs (i)(1), (2), (3), and (5) of this proposed
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 AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified
in the service information already described.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 40 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
Estimated Costs for Required Actions
||39 work-hours (for 36 airplanes
with 1 HUD) or 108 work-hours (for 4 airplanes with 2 HUDs) x $85
||$7,400 per HUD
||$10,715 (1 HUD) or
$23,980 (2 HUDs)
||1 work-hour x $85 per hour
The FAA estimates that replacement
brackets would cost up to $1,200
(per HUD) if required for any on-condition corrective actions in this
proposed AD. The FAA has received no definitive data on which to base
the work-hour estimates for this replacement. The FAA has no way of
determining the number of aircraft that might need this on-condition
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this proposed AD may be covered under warranty, thereby
reducing the cost impact on affected operators.
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 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. The time
for public reporting for this collection of information, including
reviewing instructions, searching existing data sources, gathering and
maintaining the data needed, and completing and reviewing the
collection of information, is provided in the Costs of Compliance
section already described. 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.
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
(1) Is not a ``significant regulatory action'' under Executive
(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
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