Federal Aviation Administration, DOT.
Notice of proposed rulemaking (NPRM).
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain BAE Systems (Operations) Limited Model BAE 146 series airplanes. This proposal would require repetitive inspections to detect cracking of the horizontal butt joint of the rear pressure bulkhead and repair, as necessary. This proposal also would require installation of new joint plates on the aft face of the rear pressure bulkhead, which would terminate the repetitive inspections. This action is necessary to prevent cracking of the horizontal butt joint of the rear pressure bulkhead, which could result in reduced structural integrity of the airplane. This action is intended to address the identified unsafe condition.
Comments must be received by October 15, 2001.
Submit comments in triplicate to the Federal Aviation Administration (FAA), Transport Airplane Directorate, ANM-114, Attention: Rules Docket Number 2001-NM-05-AD, 1601 Lind Avenue, SW., Renton, Washington 985-46. Comments may be inspected at this location between 9 a.m. and 3 p.m., Monday through Friday, except Federal holidays. Comments may be submitted via fax to (425) 227-1232. Comments may also be sent via the Internet using the following address: email@example.com. Comments sent via fax or the Internet must contain “Docket Number 2001-NM-05-AD” in the subject line and need not be submitted in triplicate. Comments sent via the Internet as attached electronic files must be formatted in Microsoft Word 97 for Windows or ASCII text.
The service information referenced in the proposed rule may be obtained from British Aerospace Regional Aircraft American Support, 13850 Mclearen Road, Herndon, Virginia 20171. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington.Start Further Info
FOR FURTHER INFORMATION CONTACT:
Dan Rodina, Aerospace Engineer, International Branch, ANM-116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 227-2125; fax (425) 227-1149.End Further Info End Preamble Start Supplemental Information
Interested persons are invited to participate in the making of the proposed rule by submitting such written data, views, or arguments as they may desire. Communications shall identify the Rules Docket number and be submitted in triplicate to the address specified above. All communications received on or before the closing date for comments, specified above, will be considered before taking action on the proposed rule. The proposals contained in this action may be changed in light of the comments received.
Submit comments using the following format:
- Organize comments issue-by-issue. For example, discuss a request to change the compliance time and a request to change the service bulletin reference as two separate issues.
- For each issue, state what specific change to the proposed AD is being requested.
- Include justification (e.g., reasons or data) for each request.
Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the proposed rule. All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. A report summarizing each FAA-public contact concerned with the substance of this proposal will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this action must submit a self-addressed, stamped postcard on which the following statement is made: “Comments to Docket Number 2001-NM-05-AD.” The postcard will be date stamped and returned to the commenter.
Availability of NPRMs
Any person may obtain a copy of this NPRM by submitting a request to the FAA, Transport Airplane Directorate, ANM-114, Attention: Rules Docket Number 2001-NM-05-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056.
The Civil Aviation Authority (CAA), which is the airworthiness authority for the United Kingdom, notified the FAA that an unsafe condition may exist on certain BAE Systems (Operations) Limited Model BAE 146 Series Airplanes series airplanes. The CAA advises that cracking of the horizontal butt joint on the forward and rear faces of the rear pressure bulkhead has been observed. This condition, if not corrected, could result in reduced structural integrity of the airplane.
Explanation of Relevant Service Information
BAE Systems (Operations) Limited has issued BAE Systems (Operations) Limited Inspection Service Bulletin ISB.53-42, Revision 1, dated November 3, 2000, which describes procedures for initial and repetitive detailed visual inspections for cracking of the horizontal butt joint on the forward and rear faces of the rear pressure bulkhead. BAE Systems (Operations) Limited has also issued BAE Systems (Operations) Limited Modification Service Bulletin SB.53-42-00713A, Revision 2, dated November 3, 2000, which describes procedures for installation of new joint plates at the circumferential crack stopper butt joints on the rear pressure bulkhead. Accomplishment of the actions specified in the service bulletins is intended to adequately address the identified unsafe condition. The CAA classified these service bulletins as mandatory and issued British airworthiness directive 002-11-2000, in order to assure the continued Start Printed Page 47900airworthiness of these airplanes in the United Kingdom.
These airplane models are manufactured in the United Kingdom and are type certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement. Pursuant to this bilateral airworthiness agreement, the CAA has kept the FAA informed of the situation described above. The FAA has examined the findings of the CAA, reviewed all available information, and determined that AD action is necessary for products of this type design that are certificated for operation in the United States.
Explanation of Requirements of Proposed Rule
Since an unsafe condition has been identified that is likely to exist or develop on other airplanes of the same type design registered in the United States, the proposed AD would require accomplishment of the actions specified in the service bulletins described previously.
The FAA estimates that 8 airplanes of U.S. registry would be affected by this proposed AD.
It would take approximately 1 work hours per airplane to accomplish the proposed detailed visual inspection of the horizontal butt joints on the forward and rear faces of the rear pressure bulkhead, at an average labor rate of $60 per work hour. Based on these figures, the cost impact of the proposed inspection on U.S. operators is estimated to be $480, or $60 per airplane, per inspection cycle.
It would take approximately 9 work hours per airplane to accomplish the proposed installation of new butt joints on the rear pressure bulkhead, at an average labor rate of $60 per work hour. The estimated cost of the required parts is $495. Based on these figures, the cost impact of the proposed installation on U.S. operators is estimated to be $8,280, or $1,035 per airplane.
The cost impact figures discussed above are based on assumptions that no operator has yet accomplished any of the proposed requirements of this AD action, and that no operator would accomplish those actions in the future if this proposed AD were not adopted. The cost impact figures discussed in AD rulemaking actions represent only the time necessary to perform the specific actions actually required by the AD. These figures typically do not include incidental costs, such as the time required to gain access and close up, planning time, or time necessitated by other administrative actions.
The regulations proposed herein 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. Therefore, it is determined that this proposal would not have federalism implications under Executive Order 13132.
For the reasons discussed above, I certify that this proposed regulation (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); and (3) if promulgated, 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. A copy of the draft regulatory evaluation prepared for this action is contained in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES.Start List of Subjects
List of Subjects in 14 CFR Part 39
- Air transportation
- Aviation safety
The Proposed Amendment
Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:Start Part
PART 39—AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
2. Section 39.13 is amended by adding the following new airworthiness directive:
BAE Systems (Operations) Limited (Formerly British Aerospace Regional Aircraft): Docket 2001-NM-05-AD.
Applicability: Model BAE Systems (Operations) Limited Model BAE 146 series airplanes on which Modification HCM00713A has not been accomplished, certificated in any category.
This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (f) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
Compliance: Required as indicated, unless accomplished previously.
To prevent cracking of the horizontal butt joint of the rear pressure bulkhead, which could result in reduced structural integrity of the airplane, accomplish the following:
(a) Conduct a detailed visual inspection for cracking of the horizontal butt joint of the rear pressure bulkhead, in accordance with BAE Systems (Operations) Limited Inspection Service Bulletin ISB.53-42, Revision 1, dated November 3, 2000, at the later of the times specified in paragraph (a)(1) or (a)(2) of this AD.
(1) Prior to the accumulation of 12,000 flight cycles; or
(2) Within 4,000 flight cycles or 2 years after the effective date of this AD, whichever occurs first.
For the purposes of this AD, a detailed visual inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.”
(b) Repeat the detailed visual inspection specified in paragraph (a) of this AD at intervals not to exceed 12,000 flight cycles.
(c) If cracks are detected during a detailed visual inspection required by either paragraph (a) or (b) of this AD, prior to further flight, repair the cracks in a manner approved by the Manager, International Branch, ANM-116, Transport Airplane Directorate; or the Civil Aviation Authority (CAA).
(d) Install new joint plates on the rear pressure bulkhead, in accordance with BAE Systems (Operations) Limited Modification Service Bulletin SB.53-42-00713A, Revision 2, dated November 3, 2000, at the later of the times specified in paragraph (d)(1) or (d)(2) of this AD.
(1) Prior to the accumulation of 40,000 flight cycles, or
(2) Within 6,000 flight cycles or 2 years after the effective date of this AD, whichever occurs first. Start Printed Page 47901
(e) Accomplishment of paragraph (d) of this AD terminates the need for repetitive inspections as specified in paragraph (b) of this AD.
Alternative Methods of Compliance
(f) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, International Branch, ANM-116. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, International Branch, ANM-116.
Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the International Branch, ANM-116.
Special Flight Permits
(g) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished.
The subject of this AD is addressed in British airworthiness directive 002-11-2000.
Issued in Renton, Washington, on September 7, 2001.
Vi L. Lipski,
Manager, Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. 01-23069 Filed 9-13-01; 8:45 am]
BILLING CODE 4910-13-U