[Federal Register Volume 61, Number 221 (Thursday, November 14, 1996)] [Proposed Rules] [Pages 58353-58354] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 96-29102] ======================================================================= ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 94-SW-24-AD] Airworthiness Directives; Bell Helicopter Textron, Inc., Model 214B, 214B-1 and 214ST Helicopters AGENCY: Federal Aviation Administration, DOT. ACTION: Notice of proposed rulemaking (NPRM). ----------------------------------------------------------------------- SUMMARY: This document proposes the supersedure of an existing airworthiness directive (AD), applicable to Bell Helicopter Textron, Inc. (BHTI) Model 214B, 214B-1, and 214ST series helicopters, that currently establishes a retirement life of 40,000 high-power events for the lower planetary spider (spider). This action would require changing the method of calculating the retirement life for the spider from high- power events to a maximum accumulated Retirement Index Number (RIN) of 80,000 and would make this RIN applicable to an additional part numbered spider. This proposal is prompted by fatigue analyses and tests that show certain spiders fail sooner than originally anticipated because of the unanticipated higher number of external load lifts and takeoffs (torque events) performed with those spiders in addition to the time-in-service (TIS) accrued under other operating conditions. The actions specified by the proposed AD are intended to prevent fatigue failure of the spider, which could result in failure of the main transmission and subsequent loss of control of the helicopter. DATES: Comments must be received by January 13, 1997. ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Office of the Assistant Chief Counsel, Attention: Rules Docket No. 94-SW-24-AD, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137. Comments may be inspected at this location between 9:00 a.m. and 3:00 p.m., Monday through Friday, except Federal holidays. The service information referenced in the proposed rule may be obtained from Bell Helicopter Textron, Inc., P.O. Box 482, Ft. Worth, Texas 76101. FOR FURTHER INFORMATION CONTACT: Mr. Uday Garadi, Aerospace Engineer, FAA, Rotorcraft Certification Office, Rotorcraft Directorate, Fort Worth, Texas 76193-0170, telephone (817) 222-5157, fax (817) 222-5959. 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 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 notice must submit a self-addressed, stamped postcard on which the following statement is made: ``Comments to Docket No. 94-SW-24-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, Office of the Assistant Chief Counsel, Attention: Rules Docket No. 94-SW-24-AD, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137. Discussion On August 13, 1993, the FAA issued AD 93-05-02, Amendment 39-8608 (58 FR 45833, August 31, 1993), to require changing the method of calculating the retirement life for the spider, part number (P/N) 214- 040-080-101, from flight hours to high-power events calculated using the number of takeoffs and external load lifts. That action was prompted by reports of four failures of the spider, two of which were detected during the 2,500 hour TIS overhaul inspection. The other two failures occurred in flight. The requirements of that AD are intended to prevent fatigue failure of the spider, which could result in failure of the main transmission and subsequent loss of control of the helicopter. Since the issuance of that AD, BHTI has issued BHTI Information Letter GEN-94-54, dated April 15, 1994, Subject: Retirement Index Number (RIN) For Cycle Lifed Components, which introduces a different method of accounting for fatigue damage on components that have shortened service lives as a result of frequent torque events. Additionally, BHTI has issued BHTI Alert Service Bulletin (ASB) 214-94- 53, which is applicable to the Model 214B helicopters, and ASB 214ST- 94-68, which is applicable to the Model 214ST helicopters, both of which are dated November 7, 1994 and describe procedures for converting flight hours and total number of torque events into a RIN for the spider, P/N 214-040-080-001 and -101. Although ASB 214-94-53 does not state that it applies to Model 214B-1 helicopters, this was an oversight by the manufacturer. That ASB was intended to apply to both Model 214B and 214B-1 helicopters. Additionally, P/N 214-040-080-001 was omitted from the existing AD, and is included in the applicability portion of this AD. Since an unsafe condition has been identified that is likely to exist or develop on other BHTI Model 214B, 214B-1, and 214ST helicopters of the same type design, the proposed AD would supersede AD 93-05-02 to require creation of a component history card using the RIN system, and a system for tracking increases to the accumulated RIN, and establish a maximum accumulated RIN for the spider of 80,000. The FAA estimates that 11 helicopters of U.S. registry would be affected by this proposed AD, that it would take approximately (1) 48 work hours to replace a spider affected by the new [[Page 58354]] method of determining the retirement life required by this AD; (2) 2 work hours per helicopter to create the component history card or equivalent record (record), and (3) 10 work hours per helicopter to maintain the record each year, and that the average labor rate is $60 per work hour. Required parts would cost approximately $10,920 per helicopter. Based on these figures, the total cost impact of the proposed AD on U.S. operators is estimated to be $28,220 for the first year and $27,120 for each subsequent year. These costs assume replacement of the spider in one-sixth of the fleet each year, creation and maintenance of the records for all the fleet the first year, and creation of one-sixth of the fleet's records and maintenance of the records for all the fleet each subsequent year. 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 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. 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. 106(g), 40113, 44701. Sec. 39.13 [Amended] 2. Section 39.13 is amended by removing Amendment 39-8608 (58 FR 45833, August 31, 1993) by adding a new airworthiness directive (AD), to read as follows: Bell Helicopter Textron, Inc. (BHTI): Docket No. 94-SW-24-AD. Supersedes AD 93-05-02, Amendment 39-8608. Applicability: Model 214B and 214B-1 helicopters, with lower planetary spider (spider), part number (P/N) 214-040-080-001 or - 101, and Model 214ST series helicopters, with spider, P/N 214-040- 080-101, installed, certificated in any category. Note 1: This AD applies to each helicopter 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 helicopters that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (f) to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition, or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any helicopter from the applicability of this AD. Compliance: Required within 25 hours time-in-service (TIS) after the effective date of this AD, unless accomplished previously. To prevent fatigue failure of the spider, which could result in failure of the main transmission and subsequent loss of control of the helicopter, accomplish the following: (a) Create a component history card for the main transmission upper planetary spider (spider), part number (P/N) 214-040-080-001 or -101. (b) For Model 214B and 214B-1 helicopters with spider, P/N 214- 040-080-001, determine and record the accumulated Retirement Index Number (RIN) as follows: (1) If the number of takeoffs and the number of external load lifts conducted with this spider are known, record one (1) RIN for each takeoff and one RIN for each external load lift. (2) If either the number of takeoffs or the number of external load lifts conducted with this spider are unknown, record twenty- four (24) RIN for each hour TIS. (3) If either the number of takeoffs or the number of external load lifts conducted with this spider are unknown, or the hours TIS are unknown, record twenty-one thousand, six hundred (21,600) RIN for each calendar year TIS. Prorate the number of RIN, based on the number of calendar day, for a portion of a year. (c) For Model 214B, 214B-1, and 214ST helicopters with spider, P/N 214-040-080-101, determine and record the accumulated RIN by multiplying the high-power events by two (2). Note 2: BHTI Alert Service Bulletin (ASB) No. 214-94-53, which is applicable to Model 214B and 214B-1 helicopters, and ASB No. 214ST-94-68, which is applicable to Model 214ST helicopters, both dated November 7, 1994, pertain to this subject. (d) After complying with paragraphs (a) and (b) or (c) of this AD, during each operation thereafter, maintain a count of the number and type of external load lifts and the number of takeoffs performed, and at the end of each day's operations, increase the accumulated RIN on the component history card as follows: (1) For the Model 214B and 214B-1 helicopters: (i) Increase the RIN by 1 for each takeoff. (ii) Increase the RIN by 1 for each external load lift, or increase the RIN by 2 for each external load lift operation in which the load is picked up at a higher elevation and released at a lower elevation, and the difference in elevation between the pickup point and the release point is 200 feet or greater. (2) For the Model 214ST helicopter: (i) Increase the RIN by 2 for each takeoff. (ii) Increase the RIN by 2 for each external load lift operation, or increase the RIN by 4 for each external load lift operation in which the load is picked up at a higher elevation and released at a lower elevation, and the difference in elevation between the pickup point and the release point is 200 feet or greater. (e) Remove the spider, P/N 214-0400-080-001 or -101 from service on or before attaining an accumulated RIN of 80,000. The spider is no longer retired based upon flight hours. This AD revises the Airworthiness Limitations Section of the maintenance manual by establishing a new retirement life for the spider of 80,000 RIN. (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, Rotorcraft Certification Office, FAA, Rotorcraft Directorate. Operators shall submit their requests through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Rotorcraft Certification Office. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Rotorcraft Certification Office. (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 helicopter to a location where the requirements of this AD can be accomplished. Issued in Fort Worth, Texas, on November 5, 1996. Eric Bries, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 96-29102 Filed 11-13-96; 8:45 am] BILLING CODE 4910-13-P