AD 2018-20-16

We are superseding Airworthiness Directive (AD) 2013-11-12,

which applied to certain Bombardier, Inc., Model BD-100-1A10 airplanes.

AD 2013-11-12 required inspecting for the correct serial number of a

certain hydraulic system accumulator, and replacing affected hydraulic

system accumulators with new or serviceable accumulators. This AD

expands the applicability and requires modifying or replacing certain

hydraulic brake system accumulators. This AD also requires revising the

maintenance or inspection program to add life limits for the

accumulators. This AD was prompted by a determination that certain

other hydraulic system accumulators must be modified or replaced and

life limits must be added. We are issuing this AD to address the unsafe

condition on these products.

Final rule.

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

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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]

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2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD)

2013-11-12, Amendment 39-17472 (78

[[Page 52759]]

FR 33206, June 4, 2013), and adding the following new AD:

2018-20-16 Bombardier, Inc.: Amendment 39-19450; Docket No. FAA-

2018-0161; Product Identifier 2017-NM-088-AD.

(a) Effective Date

This AD is effective November 23, 2018.

(b) Affected ADs

This AD replaces AD 2013-11-12, Amendment 39-17472 (78 FR 33206,

June 4, 2013) (``AD 2013-11-12'').

(c) Applicability

This AD applies to Bombardier, Inc., Model BD-100-1A10

airplanes, certificated in any category, having serial numbers 20003

through 20604 inclusive.

(d) Subject

Air Transport Association (ATA) of America Code 29, Hydraulic

Power.

(e) Reason

This AD was prompted by reports of failure of a screw cap or end

cap of the hydraulic system accumulator while on the ground, which

resulted in loss of use of that hydraulic system and high-energy

impact damage to adjacent systems and structures. We are issuing

this AD to prevent failure of a screw cap or end cap and loss of the

related hydraulic system, which could result in damage to airplane

structure and consequent reduced controllability of the airplane.

(f) Compliance

Comply with this AD within the compliance times specified,

unless already done.

(g) Retained Inspection With No ChangesThis paragraph restates the requirements of paragraph (g) of AD

2013-11-12 with no changes. For airplanes having serial numbers

20003 through 20335 inclusive: At the applicable time specified in

paragraph (g)(1), (g)(2), or (g)(3) of this AD: Inspect the

identification plate on the hydraulic system accumulator having part

number (P/N) 900095-1 to determine if an ``E'' is part of the suffix

of the serial number stamped on the identification plate, as listed

in paragraph 2.B. of the Accomplishment Instructions of Bombardier

Service Bulletin 100-29-14, dated December 16, 2010. A review of

airplane maintenance records is acceptable in lieu of this

inspection if the suffix of the serial number can be conclusively

determined from that review.

(1) For an accumulator that has accumulated more than 3,150

total flight cycles as of July 9, 2013 (the effective date of AD

2013-11-12), inspect that accumulator within 350 flight cycles after

July 9, 2013.

(2) For an accumulator that has accumulated 3,150 or fewer total

flight cycles as of July 9, 2013 (the effective date of AD 2013-11-

12), inspect that accumulator before it has accumulated 3,500 total

flight cycles.

(3) For an accumulator on which it is not possible to determine

the total flight cycles accumulated as of July 9, 2013 (the

effective date of AD 2013-11-12), inspect that accumulator within

350 flight cycles after July 9, 2013.

(h) Retained Replacement With No Changes

This paragraph restates the requirements of paragraph (h) of AD

2013-11-12 with no changes. If, during the inspection required by

paragraph (g) of this AD, any accumulator having P/N 900095-1 is

found on which the letter ``E'' is not part of the suffix of the

serial number on the identification plate: Before further flight,

replace the accumulator with a new or serviceable accumulator, in

accordance with paragraph 2.C. of the Accomplishment Instructions of

Bombardier Service Bulletin 100-29-14, dated December 16, 2010.

(i) Retained Parts Installation Prohibition With No Changes

This paragraph restates the requirements of paragraph (i) of AD

2013-11-12 with no changes. For airplanes having serial numbers

20003 through 20335 inclusive: As of July 9, 2013 (the effective

date of AD 2013-11-12), no person may install on any airplane a

hydraulic system accumulator having P/N 900095-1, on which the

letter ``E'' is not part of the suffix of the serial number on the

identification plate.

(j) New Requirement of This AD: Replacement of Brake System Hydraulic

Accumulators

For airplanes having serial numbers 20003 through 20347

inclusive: At the applicable time specified in paragraph (j)(1),

(j)(2), or (j)(3) of this AD, replace all brake system hydraulic

accumulators having P/N 33-147500 or P/N 33-155500 that are not

identified by the letter ``E'' or ``NAE'' after the serial number on

the identification plate with an accumulator of the same part number

that is identified by the letter ``E'' or ``NAE'' after the serial

number. Do the replacement in accordance with the Accomplishment

Instructions of Bombardier Service Bulletin 100-32-21, dated May 24,

2012.

(1) For an accumulator that has accumulated more than 4,700

total flight cycles as of the effective date of this AD, inspect

that accumulator within 300 flight cycles after the effective date

of this AD.

(2) For an accumulator that has accumulated 4,700 or fewer total

flight cycles as of the effective date of this AD, inspect that

accumulator before it has accumulated 5,000 total flight cycles.

(3) For an accumulator on which it is not possible to determine

the total flight cycles accumulated as of the effective date of this

AD, inspect that accumulator within 300 flight cycles after the

effective date of this AD.

(k) New Requirement of This AD: Additional Parts Installation

Prohibition

For airplanes having serial numbers 20003 through 20347

inclusive: As of the effective date of this AD, no person may

install on any airplane a hydraulic system accumulator having P/N

33-147500 or P/N 33-155500, on which the letter ``E'' or ``NAE'' is

not after the serial number on the identification plate.

(l) New Requirement of This AD: Modification of the Inboard and

Outboard Brake Accumulators

For airplanes having serial numbers 20003 through 20395

inclusive: Within 1,600 flight hours or 14 months after the

effective date of this AD, whichever occurs first, modify (re-

orient) the installation of the inboard and outboard brake

accumulators, in accordance with the Accomplishment Instructions of

Bombardier Service Bulletin 100-32-20, Revision02, dated April 14,

2015.

(m) Credit for Previous Actions

This paragraph provides credit for the actions specified in

paragraph (l) of this AD, if those actions were performed before the

effective date of this AD using Bombardier Service Bulletin 100-32-

20, dated February 25, 2013; or Revision 01, dated March 5, 2015.

(n) New Requirement of This AD: Maintenance or Inspection Program

Revision

For airplanes having serial numbers 20003 through 20604

inclusive: Within 30 days after the effective date of this AD,

revise the maintenance or inspection program, as applicable, to

incorporate life limit tasks 29-21-13-101, 32-43-37-101, and 32-44-

05-101 of Section 5-10-11 of Part 2, ``Airworthiness Limitations'',

of Bombardier Challenger 300 BD-100 Time Limits/Maintenance Checks

Manual, Revision 17, dated December 15, 2016; or Bombardier

Challenger 350 BD-100 Time Limits/Maintenance Checks Manual,

Revision 9, dated December 18, 2017, as applicable. The initial

compliance time for the tasks is within the applicable time

specified in that service information, or within 30 days after the

effective date of this AD, whichever occurs later.

(o) No Alternative Actions and Intervals

After the maintenance or inspection program has been revised as

required by paragraph (n) 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 (p)(1) of

this AD.

(p) Other FAA AD Provisions

(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 toyour 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,

[[Page 52760]]

FAA; or Transport Canada Civil Aviation (TCCA); or Bombardier,

Inc.'s TCCA Design Approval Organization (DAO). If approved by the

DAO, theapproval must include the DAO-authorized signature.

(q) Related Information

(1) Refer to Mandatory Continuing Airworthiness Information

(MCAI) Canadian Airworthiness Directive CF-2011-41R1, dated March

27, 2017, 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-2018-0161.

(2) For more information about this AD, contact Cesar Gomez,

Aerospace Engineer, Airframe and Mechanical Systems Section, FAA,

New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY

11590; telephone: 516-228-7318; fax: 516-794-5531.

(3) Service information identified in this AD that is not

incorporated by reference is available at the addresses specified in

paragraphs (r)(5) and (r)(6) of this AD.

(r) 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

November 23, 2018.

(i) Bombardier Service Bulletin 100-32-20, Revision 02, dated

April 14, 2015.

(ii) Bombardier Service Bulletin 100-32-21, dated May 24, 2012.

(iii) Bombardier Challenger 300 BD-100 Time Limits/Maintenance

Checks Manual, Revision 17, dated December 15, 2016, Part 2,

Airworthiness Limitations, Section 5-10-11:

(A) Task 29-21-13-101 Discard the Auxiliary Hydraulic System

Accumulator, Part No. 900095-1;

(B) Task 32-43-37-101 Discard the Brake Accumulator, Part No.

33-147500;

(C) Task 32-44-05-101 Discard the Emergency/Parking Brake

Accumulator, Part No. 33-155500.

(iv) Bombardier Challenger 350 BD-100 Time Limits/Maintenance

Checks Manual, Revision 9, dated December 18, 2017, Part 2,

Airworthiness Limitations, Section 5-10-11:

(A) Task 29-21-13-101 Discard the Auxiliary Hydraulic System

Accumulator, Part No. 900095-1;

(B) Task 32-43-37-101 Discard the Brake Accumulator, Part No.

33-147500;

(C) Task 32-44-05-101 Discard the Emergency/Parking Brake

Accumulator, Part No. 33-155500.

(4) The following service information was approved for IBR on

July 9, 2013 (78 FR 33206, June 4, 2013).

(i) Bombardier Service Bulletin 100-29-14, dated December 16,

2010.

(ii) Reserved.

(5) For service information identified in this AD, contact

Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval,

Qu[eacute]bec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-

7401; email thd.crj@aero.bombardier.com; internet http://www.bombardier.com.

(6) You may view this service information at the FAA, Transport

Standards Branch, 2200 South 216th St., Des Moines, WA. For

information on the availability of this material at the FAA, call

206-231-3195.

(7) 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.

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR

part 39 to supersede AD 2013-11-12, Amendment 39-17472 (78 FR 33206,

June 4, 2013) (``AD 2013-11-12''). AD 2013-11-12 applied to certain

Bombardier, Inc., Model BD-100-1A10 airplanes. The NPRM published in

the Federal Register on March 9, 2018 (83 FR 10415). The NPRM was

prompted by a determination that certain other hydraulic system

accumulators must be modified or replaced and life limits must be

added. The NPRM proposed to continue to require inspecting for the

correct serial number of a certain hydraulic system accumulator, and

replacing affected hydraulic system accumulators with new or

serviceable accumulators. The NPRM also proposed to expand the

applicability and require modifying or replacing certain hydraulic

brake system accumulators. The NPRM also proposed to require revising

the maintenance orinspection program to add life limits for the

accumulators. We are issuing this AD to prevent failure of a screw cap

or end cap and loss of the related hydraulic system, which could result

in damage to airplane structure and consequent reduced controllability

of the airplane.

Transport Canada Civil Aviation (TCCA), which is the aviation

authority for Canada, has issued Canadian Airworthiness Directive CF-

2011-41R1, dated March 27, 2017 (referred to after this as the

Mandatory Continuing Airworthiness Information, or ``the MCAI''), to

correct an unsafe condition for certain Bombardier, Inc. Model BD-100-

1A10 airplanes. The MCAI states:

Seven cases of on-ground hydraulic accumulator screw cap/end cap

failure have been experienced on CL-600-2B19 aeroplanes, resulting

in loss of the associated hydraulic system and high-energy impact

damage to adjacent systems and structure. To date, the lowest number

of flight cycles accumulated at the time of failure has been 6991.

Although there have been no failures to date on any BD-100-1A10

aeroplanes, accumulators similar to those installed on the CL-600-

2B19 are installed on the BD-100-1A10. The affected part numbers (P/

Ns) of the accumulators installed on BD-100-1A10 are 900095-1

(Auxiliary Hydraulic System accumulator), 33-155500 (Inboard Brake

accumulator), and 33-147500 (Outboard Brake accumulator).

A detailed analysis of the calculated line of trajectory of a

failed screw cap/end cap for the accumulators has been conducted,

resulting in the identification of areas where systems and/or

structural components could potentially be damaged. Although all of

the failures on the CL-600-2B19 to date have occurred on the ground,

an in-flight failure affecting such components could potentially

have an adverse effect on the controllability of the aeroplane.

Revision 1 of this [Canadian] AD is issued to mandate the

[inspection and] replacement [of] Brake System Hydraulic

accumulators that are not identified by the letter ``E'' or ``NAE''

after the serial number on the identification plate. Revision 1 also

mandates the re-orientation of the brake accumulators P/N 33-147500

and P/N 33-155500 and the insertion of three discard tasks in the

Challenger 300 Time Limits/Maintenance Checks (TLMC) Manual.

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-2018-

0161.

Comments

We 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.

Request To Add Maintenance Manual

NetJets Aviation stated that paragraph (n) of the proposed AD,

which requires revising the maintenance or inspection program to

incorporate certain life limit tasks, does not reference the Bombardier

Challenger 350 Time Limits/Maintenance Check (TLMC) Manual. NetJets

Aviation noted that only the Bombardier Challenger 300 TLMC Manual is

referenced.

We infer that the commenter is asking that the Bombardier

Challenger 350 TLMC Manual be added as another source of service

information for accomplishing the actions required by paragraph (n) of

this AD. We agree with the commenter's request and have changed

paragraph (n) accordingly. Although the tasks identified in the

Bombardier Challenger 300 TLMC Manual also apply to Bombardier

Challenger 350 airplanes, we have included the Bombardier Challenger

350 TLMC in this AD for clarity.

Conclusion

We 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 minoreditorial changes. We have 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.

We also determined that this change 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 has issued the following service information:

Service Bulletin 100-32-20, Revision 02, dated April 14,

2015, which describes procedures for modifying (e.g., re-orienting) the

installation of the hydraulic brake accumulators.

Service Bulletin 100-32-21, dated May 24, 2012, which

describes procedures for replacing the hydraulic brake system

accumulators.

Task 29-21-13-101 Discard the Auxiliary Hydraulic System

Accumulator, Part No. 900095-1, of Section 5-10-11 of Part 2,

``Airworthiness Limitations,'' of Bombardier Challenger 300 BD-100 Time

Limits/Maintenance Checks Manual, Revision 17, dated December 15, 2016;

and Bombardier Challenger 350, BD-100 Time Limits/Maintenance Checks

Manual, Revision 9, dated December 18, 2017, which describes procedures

for removal and installation of the hydraulic brake system

accumulators. These tasks are distinct since they apply to different

airplane models.

Task 32-43-37-101 Discard the Brake Accumulator, Part No.

33-147500, of Section 5-10-11 of Part 2, ``Airworthiness Limitations,''

of Bombardier Challenger 300 BD-100 Time Limits/Maintenance Checks

Manual, Revision 17, dated December 15, 2016; and Bombardier Challenger

[[Page 52758]]

350, BD-100 Time Limits/Maintenance Checks Manual, Revision 9, dated

December 18, 2017, which describes procedures for removal and

installation of the brake accumulators. These tasks are distinct since

they apply to different airplane models.

Task 32-44-05-101 Discard the Emergency/Parking Brake

Accumulator, Part No. 33-155500, of Section 5-10-11 of Part 2,

``Airworthiness Limitations,'' of Bombardier Challenger 300 BD-100 Time

Limits/Maintenance Checks Manual, Revision 17, dated December 15, 2016;

and Bombardier Challenger 350, BD-100 Time Limits/Maintenance Checks

Manual, Revision 9, dated December 18, 2017, which describes procedures

for removal and installation of the emergency parking brake

accumulators. These tasks are distinct since they apply to different

airplane models.

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 187 airplanes of U.S. registry.

We estimate the followingcosts to comply with this AD:

Estimated Costs

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Action Labor cost Parts cost Cost per product Cost on U.S. operators

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

Inspection to determine part 1 work-hour x $85 per $0............................ $85........................... $15,895.

numbers (retained actions from AD hour = $85.

2013[dash]11[dash]12).

Modifying or replacing hydraulic 58 work-hours x $85 Up to $31,500................. Up to $36,430................. Up to $6,812,410.

brake system accumulators (new per hour = $4,930.

actions).

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

We have determined that revising the maintenance or inspection

program takes an average of 90 work-hours per operator, although we

recognize that this number may vary from operator to operator. In the

past, we have estimated that this action takes 1 work-hour per

airplane. Since operators incorporate maintenance or inspection program

changes for their affected fleet(s), we have determined that a per-

operator estimate is more accurate than a per-airplane estimate.

Therefore, we estimate the total cost per operator to be $7,650 (90

work-hours x $85 per work-hour).

We estimate the following costs to do any necessary replacements

that will be required based on the results of the inspection. We have

no way of determining the number of aircraft that might need these

replacements.

On-ConditionCosts

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Cost per

Action Labor cost Parts cost product

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Hydraulic accumulator replacement.......... 5 work-hours x $85 per hour = $340. $4,510 $4,850

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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 inSubtitle 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.

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.