AD 2016-20-09

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2A12 (CL-601 Variant), and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. This AD was prompted by a report that a potential chafing condition exists between the negative-G fuel feed drain line of the auxiliary power unit (APU) and its surrounding structure and components. This AD requires, for certain airplanes, a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, and corrective actions if necessary. For certain other airplanes, this AD requires replacement of the APU negative-G fuel feed tube assembly and the drain line. 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

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 (AD):

2016-20-09 Bombardier, Inc.: Amendment 39-18675; Docket No. FAA- 2016-7418; Directorate Identifier 2015-NM-163-AD.

(a) Effective Date

This AD is effective January 9, 2017.

(b) Affected ADs

None.

(c) Applicability

This AD applies to Bombardier, Inc. airplanes, certificated in any category, identified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD.
(1) Model CL-600-2A12 (CL-601 Variant) airplanes, having serial numbers (S/Ns) 3001 through 3066 inclusive.
(2) Model CL-600-2B16 (CL-601-3A and CL-601-3R Variants) airplanes, having S/Ns 5001 through 5194 inclusive.
(3) Model CL-600-2B16 (CL-604 Variant) airplanes, having S/Ns 5301 through 5665 inclusive, and 5701 through 5970 inclusive.

(d) Subject

Air Transport Association (ATA) of America Code 28, Fuel.

(e) Reason

This AD was prompted by a report that a potential chafing condition exists between the negative-G fuel feed drain line of the auxiliary power unit (APU) and its surrounding structure and components. We are issuing this AD to prevent a chafing condition in the negative-G fuel feed drain line, which can result in fuel leaking from the drain line. This condition, in combination with a nearby hot surface or other potential ignition source, could result in an uncontrolled fire in the aft equipment bay.

(f) Compliance

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

(g) Inspection and Corrective Action for Certain Airplanes

Within 24 months after the effective date of this AD, comply with the applicable actions specified in paragraphs (g)(1) through (g)(3) of this AD, except as required by paragraph (i) of this AD. Do all applicable corrective actions before further flight.
(1) For Model CL-600-2A12 (CL-601 Variant) airplanes, having S/ Ns 3001 through 3066 inclusive; and Model CL-600-2B16 (CL-601-3A and CL-601-3R Variants) airplanes, having S/Ns 5001 through 5194 inclusive: Do a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, and do all applicable corrective actions, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 601-0640, dated May 19, 2015.
(2) For Model CL-600-2B16 (CL-604 Variant) airplanes, having S/ Ns 5301 through 5665 inclusive: Do a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, and do all applicable corrective actions, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 604-28- 021, dated May 19, 2015.

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(3) For Model CL-600-2B16 (CL-604 Variant) airplanes, having S/ Ns 5701 through 5913 inclusive, 5917, 5918, and 5923 through 5970 inclusive: Do a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, and do all applicable corrective actions, in accordance with the Accomplishment Instructions in Part A and, if applicable, Part B of Bombardier Service Bulletin 605-28-009, dated May 19, 2015.

(h) Modification for Certain Other Airplanes

For Model CL-600-2B16 (604 Variant) airplanes having S/Ns 5914 through 5916 inclusive and 5919 through 5922 inclusive: Within 24 months after the effective date of this AD, replace the APU negative-G fuel feed tube assembly and the drain line, in accordance with Part C of the Accomplishment Instructions of Bombardier Service Bulletin 605-28-009, dated May 19, 2015.

Note 1 to paragraph (h) of this AD: An inspection is not required.

(i) ServiceInformation Exception

Where any service information identified in paragraphs (g)(1), (g)(2), and (g)(3) of this AD specifies to contact the manufacturer for corrective action, before further flight, repair using a method approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA; or Transport Canada Civil Aviation (TCCA); or Bombardier, Inc.'s TCCA Design Approval Organization (DAO).

(j) Other FAA AD Provisions

The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New York ACO, ANE-170, 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 ACO, send it to ATTN: Program Manager, Continuing Operational Safety, FAA, New York ACO, 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, ANE-170, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO. If approved by the DAO, the approval must include the DAO-authorized signature.

(k) Related Information

Refer to Mandatory Continuing Airworthiness Information (MCAI) Canadian AD CF-2015-26, dated August 31, 2015, 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-2016-7418.

(l) 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) Bombardier Service Bulletin 601-0640, dated May 19, 2015.
(ii) Bombardier Service Bulletin 604-28-021, dated May 19, 2015.
(iii) Bombardier Service Bulletin 605-28-009, dated May 19, 2015.
(3) For service information identified in this AD, contact Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; Widebody Customer Response Center North America toll-free telephone: 1-866-538-1247 or direct-dial telephone: 1-514-855-2999; fax: 514-855-7401; email: ac.yul@aero.bombardier.com; Internet: http://www.bombardier.com.
(4) You may view this service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. For information on theavailability of this material at the FAA, call 425-227-1221.
(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, 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 by adding an AD that would apply to certain Bombardier, Inc. Model CL-600-2A12 (CL-601 Variant), and CL-600-2B16 (CL-601-3A, CL-601- 3R, and CL-604 Variants) airplanes. The NPRM published in the Federal Register on June 28, 2016 (81 FR 41889) (``the NPRM''). The NPRM was prompted by a report that a potential chafing condition exists between the negative-G fuel feed drain line of the APU and its surrounding structure and components. The NPRM proposed to require, for certain airplanes, a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, and corrective actions if necessary. For certain other airplanes, the NPRM proposed to require replacement of the APU negative-G fuel feed tube assembly and the drain line. We are issuing this AD to prevent a chafing condition in the negative-G fuel feed drain line, which can result in fuel leaking from the drain line. This condition, in combination with a nearby hot surface or other potential ignition source, could result in an uncontrolled fire in the aft equipment bay.
Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian AD CF-2015-26, dated August 31, 2015 (referred to after this as the Mandatory Continuing Airworthiness Information, or ``the MCAI''), to correct an unsafe condition for certain Bombardier, Inc. Model CL-600-2A12 (CL-601 Variant) and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. The MCAI states:

It was reported that a potential chaffing condition exist between the Auxiliary Power Unit (APU) negative-G fuel feed drain line and its surrounding structure and components. Leakage of the negative-G fuel feed drain line is a dormant failure, however, in combination with a nearby hot surface or other potential ignition source, could result in an uncontrolled fire in the aft equipment bay.
This [Canadian] AD mandates [for certain airplanes] the detailed visual inspection [for chafing conditions, e.g., fouling between the drain line and other components and insufficient clearance] and, if required, rectification [corrective actions], to ensure required clearance between the APU negative-G fuel feed drain line and its surrounding structure and components [and, for certain other airplanes, this [Canadian] AD mandates replacement of the APU negative-G fuel feed tube assembly and the drain line].

Corrective actions include replacing the APU negative-G fuel feed drain line. 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-2016-7418.

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.

Conclusion

We reviewed the relevant 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.

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Related Service Information Under 1 CFR Part 51

We reviewed the following Bombardier, Inc. service information.
Bombardier Service Bulletin 601-0640, dated May 19, 2015; and Bombardier Service Bulletin 604-28-021, dated May 19, 2015. This service information describes procedures for a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, and corrective actions. These service bulletins are distinct since they apply to different airplane models.
Bombardier Service Bulletin 605-28-009, dated May 19, 2015. This service information describes procedures for a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, replacement of the APU negative-G fuel feed tube assembly and the drain line, and corrective actions.
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 504 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:

Estimated Costs ----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators ---------------------------------------------------------------------------------------------------------------- Inspection and Modification....... 22 work-hours x $85 per $6,334$8,204 $4,134,816
hour = $1,870. ----------------------------------------------------------------------------------------------------------------

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 identifiedin this rulemaking action.

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.