AD 94-15-15 ACTIVE

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Raytheon Corporate Jets Model BAe 125-1000A and Hawker 1000 series airplanes. This action requires an inspection to detect damage and to determine the clearance between the hydraulic pipes, adjacent pipes/components, and electrical looms/cables; and repair or replacement, if necessary. This amendment is prompted by reports of chafing of an electrical loom/cable on a hydraulic pipe and of chafing between a hydraulic pipe and an adjacent pipe. The actions specified in this AD are intended to prevent loss of hydraulic pressure, electrical malfunction, or an in-flight fire due to abrasion of electrical loom/cable insulation, eventual electrical shorting of the cable, and subsequent burning of a pinhole in a pipe.

Comments for inclusion in the Rules Docket must be received on or before September 27,
1994.

Final rule; request for comments.

94-15-15 RAYTHEON CORPORATE JETS, INC. (FORMERLY BRITISH AEROSPACE, PLC): Amendment 39-8986. Docket 94-NM-103-AD.

Applicability: Model BAe 125-1000A and Hawker 1000 series airplanes; as listed in Raytheon Corporate Jets Alert Service Bulletin SB A29-92, dated May 19, 1994; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent loss of hydraulic pressure, electrical malfunction, or an in-flight fire, accomplish the following:

(a) Within 28 days after the effective date of this AD, perform a detailed visual inspection to detect any damage and to determine the clearance between the hydraulic pipes, adjacent pipes/components, and electrical looms/cables, as specified in Raytheon Corporate Jets Alert Service Bulletin A29-92, dated May 19, 1994. Perform this inspection in accordance with the procedures described in the alert service bulletin.

(b) If any damage is found, prior to further flight, accomplish either paragraph (b)(1) or (b)(2) of this AD.

(1) Replace the damaged part with a new or serviceable part in accordance with Raytheon Corporate Jets Alert Service Bulletin A29-92, dated May 19, 1994. Or

(2) Repair the damaged part in accordance a method approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

(c) If the clearance between the hydraulic pipes, adjacent pipes/components, and electrical looms/cables is less than 0.5 inch (13 mm), prior to further flight, repair in accordance with Raytheon Corporate Jets Alert Service Bulletin SB A29-92, dated May 19, 1994.

(d) 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, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then sendit to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(e) 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.

(f) The actions shall be done in accordance with Raytheon Corporate Jets Alert Service Bulletin SB A29-92, dated May 19, 1994. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Raytheon Corporate Jets Inc., 3 Bishops Square, St. Albans Road West, Hatfield, Hertfordshire, AL109NE, United Kingdom. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment becomes effective on August 15, 1994.

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 certain Raytheon Corporate Jets Model BAe 125-1000A and Hawker 1000 series airplanes. The CAA advises that it has received reports of chafing of an electrical loom/cable on a hydraulic pipe, which caused abrasion of the electrical loom/cable insulation, eventual electrical shorting of the cable, and subsequent burning of a pinhole in a pipe. The CAA also received a report of chafing between a hydraulic pipe and an adjacent pipe. A short in an AC cable combined with hydraulic fluid spray from a pinhole in a hydraulic pipe could result in disruption of the electrical system and a possible fire. These conditions, if not corrected, could result in loss of hydraulic pressure, electrical malfunction, or an in-flight fire.

Raytheon Corporate Jets, Inc., has issued Alert Service Bulletin SB A29-92,dated May 19, 1994, which describes procedures for a one-time detailed visual inspection to detect damage and to determine the clearance between the hydraulic pipes, adjacent pipes/components, and electrical looms/cables; replacement of any damaged part with a new part; and adjustment of looms/cables, pipe connections, and/or clamps, if necessary. The CAA classified this alert service bulletin as mandatory in order to assure the continued airworthiness of these airplanes in the United Kingdom.

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 actionis 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 on other airplanes of the same type design registered in the United States, this AD is being issued to prevent loss of hydraulic pressure, electrical malfunction, or an in-flight fire. This AD requires a one-time detailed visual inspection to detect damage and to determine the clearance between the hydraulic pipes, adjacent pipes/components, and electrical looms/cables; repair or replacement of any damaged part with a new or serviceable part; and adjustment of looms/cables, pipe connections, and/or clamps, if necessary. Repair of any damaged part is required to be accomplished in accordance with a method approved by the FAA. All other actions are required to be accomplished in accordance with the alert service bulletin 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 shall 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 ofthe 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 rule must submit a self-addressed, stamped postcard on which the following statement is made: "Comments to Docket Number 94-NM-103-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, oron 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 that it 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. App. 1354(a), 1421 and 1423; 49 U.S.C. 106(g); and 14 CFR 11.89.

39.13 - [Amended]
2. Section 39.13 is amended by adding the following new airworthiness directive:

Submit comments in triplicate to the Federal Aviation Administration (FAA), Transport Airplane Directorate, ANM-103, Attention: Rules Docket No. 94-NM-103-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056.
The service information referenced in this AD may be obtained from Raytheon Corporate Jets Inc., 3 Bishops Square, St. Albans Road West, Hatfield, Hertfordshire, AL109NE, United Kingdom. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

William Schroeder, Aerospace Engineer, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (206) 227-2148; fax (206) 227-1320.