Airworthiness Directive

ID: 2017-23-01
Issue date: 2017-11-14
Effective date: 2017-12-19
Subject: Landing gear
Source: FAA
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Bombardier, Inc., Airplanes

[Federal Register Volume 82, Number 218 (Tuesday, November 14, 2017)]
[Rules and Regulations]
[Pages 52644-52647]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-24166]

––––––––––––––––––––––––––––––––––

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0712; Product Identifier 2017-NM-014-AD; Amendment 39-19095; AD
2017-23-01]

RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

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

ACTION: Final rule.

––––––––––––––––––––––––––––––––––

Summary:
We are superseding Airworthiness Directive (AD) 2016-13-14, which applied to
certain Bombardier, Inc., Model DHC-8-400 series airplanes. AD 2016-13-14 required an inspection
to determine if certain left and right main landing gear (MLG) retract actuator rod ends were
installed, repetitive liquid penetrant inspections (LPIs) of affected left and right MLG retract actuator
rod ends, and corrective actions if necessary. This new AD retains the actions specified in AD 2016-
13-14 and also requires replacement of the left and right MLG retract actuator rod ends. This AD was
prompted by a report of a cracked MLG retract actuator rod end. We are issuing this AD to address
the unsafe condition on these products.

Dates:
This AD is effective December 19, 2017.
The Director of the Federal Register approved the incorporation by reference of a certain
publication listed in this AD as of July 20, 2016 (81 FR 43481, July 5, 2016).

Addresses:
For service information identified in this final rule, contact Bombardier, Inc., Q-
Series Technical Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone:
416-375-4000; fax: 416-375-4539; email: thd.qseries@aero.bombardier.com; Internet:
http://www.bombardier.com. You may view this referenced service information at the FAA,
Transport Standards Branch, 1601 Lind Avenue SW., Renton, WA. For information on the
availability of this material at the FAA, call 425-227-1221. It is also available on the Internet at
http://www.regulations.gov by searching for and locating Docket No. FAA-2017-0712.

Examining the AD Docket

You may examine the AD docket on the Internet at http://www.regulations.gov by searching for
and locating Docket No. FAA-2017-0712; or in person at the Docket Management Facility between 9

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a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD,
the regulatory evaluation, any comments received, and other information. The address for the Docket
Office (telephone: 800-647-5527) is Docket Management Facility, 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
Mechanical Systems Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone: 516-228-7329; fax: 516-794-5531.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to supersede AD
2016-13-14, Amendment 39-18579 (81 FR 43481, July 5, 2016) (“AD 2016-13-14”). AD 2016-13-14
applied to certain Bombardier, Inc., Model DHC-8-400 series airplanes. The NPRM published in the
Federal Register on July 28, 2017 (82 FR 35127). The NPRM was prompted by a report of a cracked
MLG retract actuator rod end. The NPRM proposed to continue to require the actions specified in AD
2016-13-14. The NPRM also proposed to require replacement of the left and right MLG retract
actuator rod ends. We are issuing this AD to detect and correct fatigue cracking of the left and right
MLG retract actuator rod ends, which could lead to left or right MLG collapse.
Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued
Canadian AD CF-2016-16R1, dated June 27, 2016 (referred to after this as the Mandatory Continuing
Airworthiness Information, or “the MCAI”), to correct an unsafe condition for certain Bombardier,
Inc. Model DHC-8-400 series airplanes. The MCAI states:

There has been a single reported case of a cracked MLG retract actuator rod end in
service. A supplier disclosure letter and subsequent Bombardier analysis indicate that
the MLG retract actuator rod end P/N [part number] P3A2750 and P3A2750-1 may
develop fatigue cracking. This condition, if not corrected, could lead to left hand (LH)
or right hand (RH) MLG collapse.

This [Canadian] AD mandates the inspection [to determine if certain left and right
main landing gear MLG retract actuator rod ends are installed, repetitive LPIs of
affected left and right MLG retract actuator rod ends, and corrective actions if
necessary], and replacement of the LH and RH MLG retract actuator rod ends P/N
P3A2750 and P3A2750-1 [which is terminating action for the repetitive LPIs].

This [Canadian] AD was revised to clarify paragraph B. and C. [of this Canadian AD],
which specifies when the Liquid Penetrant Inspections (LPI) should begin.

Corrective actions include replacing cracked MLG retract actuator rod ends. You may examine
the MCAI in the AD docket on the Internet at http://www.regulations.gov by searching for and
locating Docket No. FAA-2017-0712.

Comments

We gave the public the opportunity to participate in developing this AD. We received no
comments on the NPRM or on the determination of the cost to the public.



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Conclusion

We reviewed the available data and determined that air safety and the public interest require
adopting this AD as proposed except for minor editorial changes. We have determined that these
minor changes:
• Are consistent with the intent that was proposed in the NPRM for correcting the unsafe
condition; and
• Do not add any additional burden upon the public than was already proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

Bombardier, Inc., has issued Bombardier Service Bulletin 84-32-142, dated May 4, 2016. This
service information describes procedures for an inspection to determine if certain left and right MLG
retract actuator rod ends are installed, repetitive LPIs of the left and right MLG retract actuator rod
ends, and replacement of left and right MLG retract actuator rod ends. 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

We estimate that this AD affects 52 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:
The actions required by AD 2016-13-14, and retained in this AD, take about 1 work-hour per
product, at an average labor rate of $85 per work-hour. Based on these figures, the estimated cost of
the inspection that is required by AD 2016-13-14 is $85 per product.
We also estimate that it will take about 3 work-hours per product to comply with the basic
requirements of this AD. The average labor rate is $85 per work-hour. Required parts will cost about
$2,019 per product. Based on these figures, we estimate the cost of this AD on U.S. operators to be
$118,248, or $2,274 per product.
In addition, we estimate that any necessary follow-on actions will take about 3 work-hours and
require parts costing $2,019, for a cost of $2,274 per product. We have no way of determining the
number of aircraft that might need these actions.
According to the manufacturer, some of the costs of this AD may be covered under warranty,
thereby reducing the cost impact on affected individuals. We do not control warranty coverage for
affected individuals. As a result, we have included all available costs in our cost estimate.

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.
We are 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.
This AD is issued in accordance with authority delegated by the Executive Director, Aircraft
Certification Service, as authorized by FAA Order 8000.51C. In accordance with that order, issuance
of ADs is normally a function of the Compliance and Airworthiness Division, but during this
transition period, the Executive Director has delegated the authority to issue ADs applicable to
transport category airplanes to the Director of the System Oversight Division.
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Regulatory Findings

We 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. Is not a “significant rule” under the DOT Regulatory Policies and Procedures (44 FR 11034,
February 26, 1979);
3. Will not affect intrastate aviation in Alaska; and
4. 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

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

§ 39.13 [Amended]

2. The FAA amends § 39.13 by removing Airworthiness Directive (AD) 2016-13-14, Amendment
39-18579 (81 FR 43481, July 5, 2016), and adding the following new AD:




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AIRWORTHINESS
FAA DIRECTIVE
Aviation Safety
www.faa.gov/aircraft/safety/alerts/
www.gpoaccess.gov/fr/advanced.html


2017-23-01 Bombardier, Inc.: Amendment 39-19095; Docket No. FAA-2017-0712; Product
Identifier 2017-NM-014-AD.

(a) Effective Date

This AD is effective December 19, 2017.

(b) Affected ADs

This AD replaces AD 2016-13-14, Amendment 39-18579 (81 FR 43481, July 5, 2016) (“AD
2016-13-14”).

(c) Applicability

This AD applies to Bombardier, Inc., Model DHC-8-400, -401 and -402 airplanes, certificated in
any category, serial numbers 4001, and 4003 through 4325 inclusive.

(d) Subject

Air Transport Association (ATA) of America Code 32, Landing gear.

(e) Reason

This AD was prompted by a report of a cracked main landing gear (MLG) retract actuator rod
end. We are issuing this AD to detect and correct fatigue cracking of the left and right MLG retract
actuator rod ends, which could lead to left or right MLG collapse.

(f) Compliance

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

(g) Retained Part Number Inspection, With No Changes

This paragraph restates the requirements of paragraph (g) of AD 2016-13-14, with no changes.
Within 100 flight cycles after July 20, 2016 (the effective date of AD 2016-13-14), inspect the left
and right MLG retract actuator rod ends to determine if part number (P/N) P3A2750 or P3A2750-1 is
installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the part
number can be conclusively determined from that review.

(h) Retained Repetitive Liquid Penetrant Inspections (LPIs), With No Changes

This paragraph restates the requirements of paragraph (h) of AD 2016-13-14, with no changes.
For each left or right MLG retract actuator rod end having P/N P3A2750 or P3A2750-1: At the
applicable time specified in paragraph (h)(1) or (h)(2) of this AD, do an LPI to detect cracks of the

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MLG retract actuator rod end, in accordance with the Accomplishment Instructions of Bombardier
Service Bulletin 84-32-142, dated May 4, 2016, except as required by paragraph (k) of this AD.
Thereafter, repeat the LPI at intervals not to exceed 600 flight cycles.
(1) If the MLG retract actuator rod end has accumulated more than 6,000 flight cycles as of July
20, 2016 (the effective date of AD 2016-13-14): Inspect within 100 flight cycles after July 20, 2016.
(2) If the MLG retract actuator rod end has accumulated 6,000 flight cycles or fewer as of July
20, 2016 (the effective date of AD 2016-13-14): Inspect within 600 flight cycles after July 20, 2016.

(i) Retained Corrective Action, With No Changes

This paragraph restates the requirements of paragraph (i) of AD 2016-13-14, with no changes. If
any crack is found during any inspection required by paragraph (h) of this AD, before further flight,
replace the cracked MLG retract actuator rod end, P/N P3A2750 or P3A2750-1, with a MLG retract
actuator rod end, P/N P3A6460, in accordance with the Accomplishment Instructions of Bombardier
Service Bulletin 84-32-142, dated May 4, 2016, except as required by paragraph (k) of this AD.

(j) Retained Optional Replacement, With No Changes

This paragraph restates the optional replacement specified in paragraph (j) of AD 2016-13-14,
with no changes. Replacement of the left and right side MLG retract actuator rod ends, P/N P3A2750
or P3A2750-1, with left and right MLG retract actuator rod ends, P/N P3A6460, in accordance with
the Accomplishment Instructions of Bombardier Service Bulletin 84-32-142, dated May 4, 2016,
except as required by paragraph (k) of this AD, constitutes terminating action for the actions required
by paragraphs (g) and (h) of this AD for that airplane.

(k) Retained Exception, With No Changes

This paragraph restates the requirements of paragraph (k) of AD 2016-13-14, with no changes. If
it is not possible to complete all the instructions in Bombardier Service Bulletin 84-32-142, dated
May 4, 2016, because of the configuration of the airplane: 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).

(l) Retained Parts Installation Prohibition, With No Changes

This paragraph restates the requirements of paragraph (l) of AD 2016-13-14, with no changes.
As of July 20, 2016 (the effective date of AD 2016-13-14), no person may install a left or right MLG
retract actuator rod end, P/N P3A2750 or P3A2750-1, on any airplane.

(m) New Requirement of This AD: Replacement

Within 1,800 flight cycles after accomplishing the initial inspection required by paragraph (g) of
this AD, replace the left and right side MLG retract actuator rod ends having P/N P3A2750 or
P3A2750-1, with left and right MLG retract actuator rod ends having P/N P3A6460, in accordance
with the Accomplishment Instructions of Bombardier Service Bulletin 84-32-142, dated May 4, 2016,
except as required by paragraph (k) of this AD. Accomplishing this replacement terminates the
requirements of paragraphs (g) and (h) of this AD for that airplane.

(n) Other FAA AD Provisions

The following provisions also apply to this AD:


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(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 corrective actions
from a manufacturer, the action 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.

(o) Related Information

(1) Refer to Mandatory Continuing Airworthiness Information (MCAI) Canadian AD CF-2016-
16R1, dated June 27, 2016, for related information. This MCAI may be found in the AD docket on
the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-0712.
(2) For more information about this AD, contact Aziz Ahmed, Aerospace Engineer, Airframe
and Mechanical Systems Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone: 516-228-7329; fax: 516-794-5531.

(p) 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.
(3) The following service information was approved for IBR on July 20, 2016 (81 FR 43481,
July 5, 2016).
(i) Bombardier Service Bulletin 84-32-142, dated May 4, 2016.
(ii) Reserved.
(4) For service information identified in this AD, contact Bombardier, Inc., Q-Series Technical
Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone: 416-375-4000;
fax: 416-375-4539; email: thd.qseries@aero.bombardier.com; Internet: http://www.bombardier.com.
(5) You may view this service information at the FAA, Transport Standards Branch, 1601 Lind
Avenue SW., Renton, WA. For information on the availability of this material at the FAA, call 425-
227-1221.
(6) 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, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

Issued in Renton, Washington, on October 30, 2017.
Jeffrey E. Duven,
Director, System Oversight Division,
Aircraft Certification Service.




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This is a partial extract of the full document - please refer to the actual report for full information.
Sources as credited.