AD 98-10-15

The Federal Aviation Administration (FAA) has received a report of a cracked fuel line between the main fuel pump and the motive flow pump causing the spraying of fuel on and around electrical components on an AlliedSignal Inc. Model TFE731-40R-200G turbofan engine. While taxiing after flight, the ground crew noted a fuel leak from the right hand engine of an Israel Aircraft Industries, LTD. (IAI) Astra SPX aircraft. The fuel line, part number (P/N) 3061191-1, between the main fuel pump and the motive flow pump, was found cracked at the weld of the elbow fitting. The right-hand engine had accumulated 8 operating hours. The investigation revealed that during manufacturing of the fuel line between the main fuel pump and the motive flow pump, inadequate weld penetration was created by an orbital weld operation. The lack of penetration was not identified by the post-weld X-ray inspection. The fracture of the fuel line was due to high cycle fatigue which initiated at the localized area of incomplete weld penetration. This condition, if not corrected, could result in fuel spraying on and around electrical components due to a cracked fuel line, which could result in an engine fire. The FAA has reviewed and approved the technical contents of AlliedSignal Inc. Alert Service Bulletin (ASB) No. TFE731-A73-5111, dated April 16, 1998, that describes procedures for replacing the fuel line between the main fuel pump and the motive flow pump with a serviceable assembly and adding a supporting bracket and clamp. Since an unsafe condition has been identified that is likely to exist or develop on other engines of the same type design, this AD is being issued to prevent fuel line cracking. This AD requires, within 10 hours time in service (TIS) after the effective date of this AD, replacing the fuel line between the main fuel pump and the motive flow pump with a serviceable assembly and adding a supporting bracket and clamp. The actions are required to be accomplished in accordance with the ASB described previously. Since a situation exists that requires the immediate adoption of this regulation, it is found that notice and opportunity for prior public comment hereon are impracticable, and that good cause exists for making this amendment effective in less than 30 days. Comments Invited Although this action is in the form of a final rule that involves requirements affecting flight safety and, thus, was not preceded by notice and an opportunity for public comment, comments are invited on this rule. Interested persons are invited to comment on this 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 under the caption "ADDRESSES." All communications received on or before the closing date for comments will be considered, and this rule may be amended in light of the comments received.Factual information that supports the commenter's ideas and suggestions is extremely helpful in evaluating the effectiveness of the AD action and determining whether additional rulemaking action would be needed. Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify the 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 AD 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 Number 98-ANE-30-AD." The postcard will be date stamped and returned to the commenter. The regulations adopted herein will 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 final rule does not have sufficient federalism implications to warrant the preparation of a Federalism Assessment. The FAA has determined that this regulation is an emergency regulation that must be issued immediately to correct an unsafe condition in aircraft, and is not a "significant regulatory action" under Executive Order 12866. It has been determined further that this action involves an emergency regulation under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979). If it is determined that this emergency regulation otherwise would be significant under DOT Regulatory Policies and Procedures, a final regulatory evaluation will be prepared and placed in the Rules Docket. A copy of it, if filed, may be obtained from the Rules Docket at the location provided under the caption "ADDRESSES." List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. Adoption of the Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends 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. 39.13 [Amended] 2. Section 39.13 is amended by adding the following new airworthiness directive: