Source: https://www.federalregister.gov/documents/2012/06/01/2012-13329/airworthiness-directives-bombardier-inc-airplanes
Timestamp: 2017-10-23 10:40:00
Document Index: 715946013

Matched Legal Cases: ['art 2', 'art 2', '§\u200939', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2']

We must receive comments on this proposed AD by July 16, 2012.
77 FR 32439
32439-32441 (3 pages)
Docket No. FAA-2012-0496
Directorate Identifier 2011-NM-263-AD
2012-13329
FAA-2012-0496
Bombardier, Inc. Model CL?600?2B19 (Regional Jet Series 100 & 440) airplanes
(g) Retained Revision to the Airworthiness Limitations (AWL) Section
(h) Retained General Revision of MRM
(i) New Revision of the Maintenance Program
(j) No Alternative Actions or Intervals
https://www.federalregister.gov/d/2012-13329 https://www.federalregister.gov/d/2012-13329
We propose to supersede an existing airworthiness directive (AD) that applies to certain Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. The existing AD currently requires revising the airworthiness limitations section (AWL) of the instructions for continued airworthiness (ICA) of the Canadair Regional Jet Maintenance Requirements Manual by incorporating new procedures for repetitive detailed and special detailed inspections for cracking of the aft pressure bulkhead. Since we issued that AD, we have received multiple reports of cracks on the forward face of the rear pressure bulkhead (RPB) web. This proposed AD would require revising the maintenance program to incorporate a revised task specified in a certain temporary revision, which requires an improved non-destructive inspection procedure; and adds airplanes to the applicability. We are proposing this AD to detect and correct cracking in the RPB, which could result in reduced structural integrity and rapid decompression of the airplane.
For service information identified in this proposed AD, contact Bombardier, Inc., 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; email thd.crj@aero.bombardier.com; Internet http://www.bombardier.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221.
Jeffrey Zimmer, Aerospace Engineer, Airframe & Mechanical Systems Branch, ANE-171, New York Aircraft Certification Office (ACO), FAA, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7306; fax (516) 794-5531.
We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include “Docket No. FAA-2012-0496; Directorate Identifier 2011-NM-263-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD based on those comments.
On October 31, 2005, we issued AD 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005). That AD required actions intended to address an unsafe condition on the products listed above. Since we issued AD 2005-23-01, Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian Airworthiness Directive CF-2011-30, dated August 11, 2011 (referred to after this as “the MCAI”), to correct an unsafe condition for the specified products. The MCAI states:
Cracks on the forward face of the Rear Pressure Bulkhead (RPB) web have been discovered on three CL-600-2B19 aeroplanes in-service. This indicates that the existing inspection requirements of Airworthiness Limitation (AWL) task 53-61-153 mandated by [TCCA] AD CF-2005-13R1 are not adequate. Failure of the RPB could result in rapid decompression of the aeroplane.
A Temporary Revision has been made to Part 2 of the Maintenance Requirements Manual (MRM) to revise the existing AWL task by introducing an improved Non-Destructive Inspection (NDI) procedure to ensure that fatigue cracking of the RPB is detected and corrected.
This [TCCA] directive mandates the incorporation of a new NDI procedure for AWL task number 53-61-153.
Bombardier Inc. has issued Temporary Revision 2B-2187, dated June 22, 2011, to Appendix B—Airworthiness Limitations, of Part 2 of the Bombardier CL-600-2B19 MRM. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI.
Based on the service information, we estimate that this proposed AD would affect about 586 products of U.S. registry.
The actions that are required by AD 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005), and retained in this proposed AD take about 2 work-hours per product, at an average labor rate of $85 per work hour. Based on these figures, the estimated cost of the currently required actions is $170 per product.
We estimate that it would take about 1 work-hour per product to comply with the new basic requirements of this proposed AD. The average labor rate is $85 per work-hour. Based on these figures, we estimate the cost of the proposed AD on U.S. operators to be $49,810, or $85 per product.
2. The FAA amends § 39.13 by removing airworthiness directive (AD) 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005), and adding the following new AD:
Bombardier, Inc.: Docket No. FAA-2012-0496; Directorate Identifier 2011-NM-263-AD.
We must receive comments by July 16, 2012.
This AD supersedes AD 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005).
(1) This AD applies to Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category, serial numbers 7003 and subsequent.
(2) This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (k)(1) of this AD. The request should include a description of changes to the required inspections that will ensure the continued damage tolerance of the affected structure. The FAA has provided guidance for this determination in FAA Advisory Circular (AC) 25.1529-1A, dated November 20, 2007 (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/list/AC%2025.1529-1A/$FILE/AC%2025.1529-1A.pdf).
This AD was prompted by multiple reports of cracks on the forward face of the rear pressure bulkhead (RPB) web. We are issuing this AD to detect and correct cracking in RPB, which could result in reduced structural integrity and rapid decompression of the airplane.
This paragraph restates the requirements of paragraph (f) of AD 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005). For airplanes having serial numbers 7003 through 8025 inclusive, 8030, and 8034: Within 30 days after November 29, 2005 (the effective date of AD 2005-23-01), revise the Airworthiness Limitations section of the Instructions for Continued Airworthiness of the Canadair Regional Jet Maintenance Requirements Manual (MRM), Part 2, Appendix B, “Airworthiness Limitations,” by incorporating the information specified in AWL Number 53-61-153 of the Canadair Regional Jet Temporary Revision (TR) 2B-2109, dated October 13, 2005, into the AWL section. Perform the applicable detailed and special detailed inspections for cracking of the aft pressure bulkhead, as specified in the TR, at the applicable compliance time specified in table 1 of this AD. Repeat the detailed inspection thereafter at intervals not to exceed 1,085 flight cycles, and repeat the special detailed inspection thereafter at intervals not to exceed 4,360 flight cycles, in accordance with the procedures specified in AWL Number 53-61-153, as introduced by Canadair Regional Jet TR 2B-2109, dated October 13, 2005, to Appendix B, “Airworthiness Limitations,” of Part 2 of the Canadair Regional Jet MRM.
Table 1—Compliance Times for Initial Inspections
As of November 29, 2005 (the effective date of AD 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005)): If the total flight cycles accumulated on the airplane are—
Inspect before the airplane accumulates—
8,000 or fewer 12,000 total flight cycles.
More than 8,000 but fewer than 12,000 15,000 total flight cycles or within 4,000 flight cycles after November 29, 2005 (the effective date of AD 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005)), whichever is first.
12,000 or more but fewer than 15,000 17,000 total flight cycles or within 3,000 flight cycles after November 29, 2005 (the effective date of AD 2005-23-01), whichever is first.
15,000 or more but fewer than 17,000 18,500 total flight cycles or within 2,000 flight cycles after November 29, 2005 (the effective date of AD 2005-23-01), whichever is first.
17,000 or more but fewer than 18,500 19,500 total flight cycles or within 1,500 flight cycles after November 29, 2005 (the effective date of AD 2005-23-01), whichever is first.
18,500 or more but fewer than 19,500 20,000 total flight cycles or within 1,000 flight cycles after November 29, 2005 (the effective date of AD 2005-23-01), whichever is first.
19,500 or more 500 flight cycles after November 29, 2005 (the effective date of AD 2005-23-01).
This paragraph restates the requirements of paragraph (g) of AD 2005-23-01, Amendment 39-14359 (70 FR 69073, November 14, 2005). For airplanes having serial numbers 7003 through 8025 inclusive, 8030, and 8034: When the information in AWL Number 53-61-153 of the Canadair Regional Jet TR 2B-2109, dated October 13, 2005, to Appendix B, “Airworthiness Limitations,” of Part 2 of the Canadair Regional Jet MRM, is included in the general revisions of the MRM, the general revisions may be inserted into the AWL section of the Instructions for Continued Airworthiness, and this information may be removed from the MRM.
Within 60 days after the effective date of this AD: Revise the maintenance program by incorporating the revised inspection requirements specified in AWL Number 53-61-153 of Bombardier TR 2B-2187, dated June 22, 2011, to Appendix B -Airworthiness Limitations, of Part 2 of the Bombardier CL-600-2B19 MRM. The initial compliance times for the task start at the applicable time specified in paragraphs (i)(1) and (i)(2) of this AD. Doing an inspection required by paragraph (i) of this AD terminates the requirements of paragraph (g) of this AD.
(1) For airplanes that have accumulated 10,500 total flight cycles or less as of the effective date of this AD: Before the accumulation of 12,000 total flight cycles.
(2) For airplanes that have accumulated more than 10,500 total flight cycles as of the effective date of this AD: Within 1,500 flight cycles after the effective date of this AD, or at the next scheduled inspection interval for AWL Number 53-61-153, whichever occurs first.
After accomplishing the revisions required by paragraph (i) of this AD, no alternative actions (e.g., inspections) or intervals may be used other than those specified in Canadair Regional Jet TR 2B-2109, dated October 13, 2005, to Appendix B, “Structural Airworthiness Limitations, of Part 2 of the Canadair Regional Jet MRM; and Bombardier TR 2B-2187, dated June 22, 2011, to Appendix B—Airworthiness Limitations, of Part 2 of the Bombardier CL-600-2B19 MRM; unless the actions and intervals are approved as an AMOC in accordance with the procedures specified in paragraph (k)(1) of this AD.
(1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (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 manager of the ACO, send it to ATTN: Program Manager, Continuing Operational Safety, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 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. The AMOC approval letter must specifically reference this AD.
Refer to MCAI Canadian Airworthiness Directive CF-2011-30, dated August 11, 2011, and the following temporary revision; for related information.
(1) Bombardier TR 2B-2187, dated June 22, 2011, to Appendix B—Airworthiness Limitations, of Part 2 of the Bombardier CL-600-2B19 MRM.
(2) Canadair Regional Jet TR 2B-2109, dated October 13, 2005, to Appendix B, “Airworthiness Limitations,” of Part 2 of the Canadair Regional Jet MRM.
Issued in Renton, Washington, on May 18, 2012.
[FR Doc. 2012-13329 Filed 5-31-12; 8:45 am]