AD 96-17-09

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Beech (Raytheon) Model Hawker 1000 and BAe 125-1000A series airplanes, that currently requires inspections to detect various discrepancies of the fuel hose assemblies on the auxiliary power unit (APU), and correction of any discrepancy found. That AD was prompted by several reports of heat damage to the fuel hose assembly on the APU. This amendment adds a requirement to replace the existing conduit of the fuel feed hose with new improved conduit, which will terminate the repetitive inspections. The actions specified by this AD are intended to prevent failure of a fuel hose due to heat damage caused by incorrect routing or bleed air leakage; such failure could result in a malfunction of the APU, a fuel fire in the fuselage rear equipment bay, and reduced structural integrity of the surrounding structure.

The incorporation by reference of Raytheon Service Bulletin SB 49-44, dated January 20, 1995, listed in the regulations was approved previously by the Director of the Federal Register as of May 23, 1995 (60 FR 22501, May 8, 1995)

Final rule.

96-17-09 BEECH AIRCRAFT CORPORATION (formerly DeHavilland; Hawker Siddeley; British Aerospace, plc; Raytheon Corporate Jets, Inc.): Amendment 39-9718. Docket 96-NM-54-AD. Supersedes AD 95-10-01, Amendment 39-9218.

Applicability: Model Hawker 1000 and BAe 125-1000A series airplanes, post modification 259722C; certificated in any category.

NOTE 1: 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 (c) 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 hasnot been eliminated, the request should include specific proposed actions to address it.

NOTE 2: Beech (Raytheon) Model BAe 125-1000B series airplanes are similar in design to the airplanes that are subject to the requirements of this AD and, therefore, also may be subject to the unsafe condition addressed by this AD. However, as of the effective date of this AD, those models are not type certificated for operation in the United States. Airworthiness authorities of countries in which the Model BAe 125-1000B series airplanes are approved for operation should consider adopting corrective action, applicable to those models, that is similar to the corrective action required by this AD.

Compliance: Required as indicated, unless accomplished previously.

To prevent failure of a fuel hose assembly on the auxiliary power unit (APU), which could result in a malfunction of the APU, a potential fuel fire in the fuselage rear bay, and reduced structural integrity of the surrounding structure, accomplish the following:

(a) Within 30 days after May 23, 1995 (the effective date of AD 95-10-01, amendment 39-9218), perform inspections to detect discrepancies of the fuel feed hose assemblies on the APU; an inspection to assure proper positioning of the air leak detection system; and an inspection of the bleed air system for signs of leakage; in accordance with paragraph 2.B. of the Accomplishment Instructions of Raytheon Service Bulletin SB 49-44, dated January 20, 1995.

(1) If no discrepancy is found: Thereafter, following the last flight of each day, perform an inspection to detect discoloration of the fuel hose assembly (outlet from the fuel pump box) on the APU, in accordance with paragraph 2.B.(2) and 2.C. of the Accomplishment Instructions of the service bulletin.

(2) If any discrepancy is found, prior to further flight, correct the discrepancy in accordance with paragraph 2.B. of the Accomplishment Instructions of the service bulletin.(b) Within 200 flight hours after the effective date of this AD, replace the existing conduit of the fuel feed hose for the auxiliary power unit (APU) with new improved conduit (modification 25A825A), in accordance with Beech (Raytheon/Hawker) Service Bulletin SB.49-47-25A825A, dated August 1, 1995. Accomplishment of the replacement constitutes terminating action for paragraph (a) of this AD.

(c) 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, Wichita Aircraft Certification Office (ACO), FAA, Small Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Wichita ACO.

NOTE 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita ACO.

(d) Special flight permits maybe 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.

(e) The actions shall be done in accordance with Raytheon Service Bulletin SB 49-44, dated January 20, 1995, or Beech (Raytheon/Hawker) Service Bulletin SB.49-47-25A825A, dated August 1, 1995. The incorporation by reference of Beech (Raytheon/Hawker) Service Bulletin SB.49-47-25A825A, dated August 1, 1995, was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. The incorporation by reference of Raytheon Service Bulletin SB 49-44, dated January 20, 1995, was approved previously by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51 as of May 23, 1995 (60 FR 22501, May 8, 1995). Copies may be obtained from Beech Aircraft Corporation, Hawker Customer Support Department, P.O. Box 85, Wichita, Kansas 67201-0085. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Wichita Aircraft Certification Office, Small Airplane Directorate, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(f) This amendment becomes effective on September 24, 1996.

A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) by superseding AD 95-10-01, amendment 39-9218 (60 FR 22501, May 8, 1995), which is applicable to certain Beech (Raytheon) Model Hawker 1000 and BAe 125-1000A series airplanes, was published in the Federal Register on May 21, 1996 (61 FR 25418). That action proposed to supersede AD 95-10-01 to continue to require inspections to detect various discrepancies of the fuel hose assemblies on the auxiliary power unit (APU), and correction of any discrepancy found. That action also proposed to add a new requirement to replace the existing vinyl conduit of the fuel feed hose for the APU with a new improved conduit, which would constitute terminating action for the repetitive inspection requirements.

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments were submitted in response to the proposal or the FAA's determinationof the cost to the public. The FAA has determined that air safety and the public interest require the adoption of the rule as proposed.

Cost Impact
There are approximately 48 Beech Model Hawker 1000 and BAe 125-1000A series airplanes of the affected design in the worldwide fleet. The FAA estimates that 31 airplanes of U.S. registry will be affected by this proposed AD.

The actions that are currently required by AD 95-10-01 and retained in this new AD take approximately 1 work hour per airplane to accomplish, at an average labor rate of $60 per work hour. Based on these figures, the cost impact on U.S. operators of the actions currently required is estimated to be $1,860, or $60 per airplane.

The new actions that are required by this new AD will take approximately 4 work hours per airplane to accomplish, at an average labor rate of $60 per work hour. Required parts will cost approximately $218 per airplane. Based on these figures, the cost impact on U.S. operatorsof the new requirements of this AD is estimated to be $14,198, or $458 per airplane.

The cost impact figures discussed above are based on assumptions that no operator has yet accomplished any of the requirements of this AD action, and that no operator would accomplish those actions in the future if this AD were not adopted.

Regulatory Impact
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.

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) 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 final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it 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 removingamendment 39-9218 (60 FR 22501, May 8, 1995), and by adding a new airworthiness directive (AD), amendment 39-9718, to read as follows: