[Federal Register Volume 59, Number 198 (Friday, October 14, 1994)] [Unknown Section] [Page 0] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 94-25441] [[Page Unknown]] [Federal Register: October 14, 1994] ======================================================================= ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 94-CE-13-AD] Airworthiness Directives; Jetstream Aircraft Limited (Formerly British Aerospace, Regional Airlines Limited) HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes AGENCY: Federal Aviation Administration, DOT. ACTION: Notice of proposed rulemaking. ----------------------------------------------------------------------- SUMMARY: This document proposes to adopt a new airworthiness directive that would apply to Jetstream Aircraft Limited (JAL) HP137 Mk1, Jetstream series 200 and Jetstream Models 3101 and 3201 airplanes. The proposed action would require repetitively inspecting the left and right pilot windscreens for poly vinyl butyrate (PVB) interlayer cracks, and replacing any windscreen that has a crack that exceeds certain limits. Several reports of varying degrees of PVB interlayer cracking of pilot windscreens on the affected airplanes prompted the proposed action. The proposed actions are intended to prevent such windscreen cracking, which, if not detected and corrected, could result in decompression injuries. DATES: Comments must be received on or before December 19, 1994. ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Central Region, Office of the Assistant Chief Counsel, Attention: Rules Docket No. 94-CE-13-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. Comments may be inspected at this location between 8 a.m. and 4 p.m., Monday through Friday. Service information that applies to the proposed AD may be obtained from Jetstream Aircraft Limited, Manager Product Support, Prestwick Airport, Ayrshire, KA9 2RW Scotland; telephone (44-292) 79888; facsimile (44-292) 79703; or Jetstream Aircraft Inc., Librarian, P.O. Box 16029, Dulles International Airport, Washington, DC, 20041-6029; telephone (703) 406-1161; facsimile (703) 406-1469. This information also may be examined at the Rules Docket at the address above. FOR FURTHER INFORMATION CONTACT: Mr. Raymond A. Stoer, Program Officer, Brussels Aircraft Certification Office, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, B-1000 Brussels, Belgium; telephone (322) 513.3830; facsimile (322) 230.6899; or Mr. John P. Dow, Sr., Program Officer, Small Airplane Directorate, Airplane Certification Service, FAA, 1201 Walnut, suite 900, Kansas City, Missouri 64106; telephone (816) 426-6932; facsimile (816) 426-2169. SUPPLEMENTARY INFORMATION: Comments Invited 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 should 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 notice may be changed in light of the comments received. 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 that summarizes 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 notice must submit a self-addressed, stamped postcard on which the following statement is made: ``Comments to Docket No. 94-CE-13-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, Central Region, Office of the Assistant Chief Counsel, Attention: Rules Docket No. 94-CE-13-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. Discussion The Civil Aviation Authority (CAA), which is the airworthiness authority for the United Kingdom, recently notified the FAA that an unsafe condition may exist on JAL HP137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes. The CAA reports several incidents of varying degrees of PVB interlayer cracking of pilot windscreens on the affected airplanes. Jetstream Aircraft Limited has issued SB 56-JA 920843, Revision 1, dated December 16, 1993, which specifies procedures for inspecting the left and right windscreens for PVB interlayer cracks. This document also introduces Pilkington Aerospace (the windscreen manufacturer) SB No. 037-56-1001, Issue Date: October 21, 1992, Revision 1: March 31, 1993. The latter document includes a figure that shows a cross section of the windscreen from where cracking can originate and also sets in- service cracking limits for the affected windscreens. The CAA classified Jetstream SB 56-JA 92-843 as mandatory in order to assure the continued airworthiness of these airplanes in the United Kingdom. The CAA classifying a service bulletin as mandatory in the United Kingdom is equivalent to the FAA issuing an airworthiness directive in the United States. This airplane model is manufactured in the United Kingdom and is 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. Since an unsafe condition has been identified that is likely to exist or develop in other JAL HP137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes of the same type design, the proposed AD would require repetitively inspecting the left and right pilot windscreens for PVB interlayer cracks, and replacing any windscreen that has a crack that exceeds certain limits. The proposed actions would be accomplished in accordance with the service information described above. The FAA estimates that 160 airplanes in the U.S. registry would be affected by the proposed AD, that it would take approximately 1 workhour per airplane to accomplish the proposed modification, and that the average labor rate is approximately $55 an hour. Based on these figures, the total cost impact of the proposed AD on U.S. operators is estimated to be $8,800. This figure does not take into account for any possible window replacements nor repetitive inspections. The FAA has no way of determining how many windscreens may have PVB interlayer cracks that exceed the limitations and would require replacement, or the number of repetitive inspections each owner/operator may incur. The regulations proposed herein would not have substantial direct effects 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, in accordance with Executive Order 12612, it is determined that this proposal would not have sufficient federalism implications to warrant the preparation of a Federalism Assessment. For the reasons discussed above, I certify that this action (1) is not a ``significant regulatory action'' under Executive Order 12866; (2) is not a ``significant rule'' under 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 has been placed in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, 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: PART 39--AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. App. 1354(a), 1421 and 1423; 49 U.S.C. 106(g); and 14 CFR 11.89. Sec. 39.13 [Amended] 2. Section 39.13 is amended by adding a new AD to read as follows: Jetstream Aircraft Limited: Docket No. 94-CE-13-AD. Applicability: HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 airplanes (all serial numbers), certificated in any category. Compliance: Required within the next 300 hours time-in-service (TIS) after the effective date of this AD, unless already accomplished, and thereafter as indicated. To prevent pilot windscreen poly vinyl butyrate (PVB) interlayer cracking, which, if not detected and corrected, could result in decompression injuries, accomplish the following: (a) Visually inspect the left and right windscreens for PVB interlayer cracks in accordance with the ACCOMPLISHMENT INSTRUCTIONS section of Jetstream Service Bulletin (SB) 56-JA 92-843, Revision No. 1, dated December 16, 1993. (1) If any crack is found that is within the limits specified in Pilkington Aerospace SB No. 037-56- 1001, Issue Date: October 21, 1992, Revision 1: March 31, 1993, reinspect within the next 300 hours TIS, and replace or reinspect the windscreen thereafter as applicable. (2) If any crack is found that exceeds the limits specified in Pilkington Aerospace SB No. 037-56-1001, Issue Date: October 21, 1992, Revision 1: March 31, 1993, prior to further flight, replace the windscreen with a new windscreen and reinspect within the next 2,400 hours TIS, and replace or reinspect the windscreen thereafter as applicable. (3) If no cracks are found, reinspect the windscreen within the next 2,400 hours TIS, and replace or reinspect the windscreen thereafter as applicable. (b) Special flight permits may be issued in accordance with Secs. 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. (c) An alternative method of compliance or adjustment of the initial or repetitive compliance times that provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Office, Europe, Africa, Middle East office, FAA, c/o American Embassy, 1000 Brussels, Belgium. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Office. Note: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Brussels Aircraft Certification Office. (d) All persons affected by this directive may obtain copies of the documents referred to herein upon request to Jetstream Aircraft Limited, Manager Product Support, Prestwick Airport, Ayrshire, KA9 2RW Scotland; telephone (44-292) 79888; or Jetstream Aircraft Inc., Librarian, P.O. Box 16029, Dulles International Airport, Washington, DC, 20041-6029; or may examine these documents at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. Issued in Kansas City, Missouri, on October 7, 1994. John R. Colomy, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. 94-25441 Filed 10-13-94; 8:45 am] BILLING CODE 4910-13-U