97-21-05: High Pressure Oxygen Hose Assemblies

97-21-05 RAYTHEON AIRCRAFT COMPANY (Formerly Beech, Raytheon Corporate Jets, British Aerospace, Hawker Siddeley, et al.): Amendment 39-10158. Docket 96-NM-274-AD. Applicability: All Model DH.125-400A, BH.125-400A and -600A, HS.125-600A and -700A, and BAe 125-800A series airplanes; and Model Hawker 800 and Hawker 800 XP series airplanes (including Military Variants C29A, U125, and U125A airplanes); having serial numbers 1 through 258294 inclusive; on which Modification 252036 has been installed with a high pressure oxygen hose assembly having part number WKA 34609; certificated in any category. NOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise 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 requestapproval 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 has not been eliminated, the request should include specific proposed actions to address it. NOTE 2: Raytheon (Beech) Model DH.125-400B, BH.125-400B and -600B, HS. 125-600B and -700B, and BAe 125-800B 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 those models are approved for operation should consider adopting corrective action, applicable to these models, that is similar to the corrective action required by this AD. Compliance: Required as indicated, unless accomplished previously. To prevent leaks in high pressure oxygen hose assemblies, which could result in insufficient oxygen quantity available to the passengers or crew if the cabin pressure altitude should rise to a level requiring emergency oxygen, accomplish the following: (a) Within 90 days after the effective date of this AD, perform a one-time inspection to determine whether any high pressure oxygen hose assembly having a discrepant part number WKA 34609 is installed, in accordance with Raytheon Service Bulletin SB.35-46, dated September 30, 1996. If no discrepant part number is detected, no further action is required by this AD. If any hose assembly having discrepant part number WKA 34609 is installed, prior to further flight, replace the hose assembly with a hose assembly having part number 58179-101, in accordance with the service bulletin. (b) As of the effective date of this AD, no person shall install ahigh pressure oxygen hose having part number WKA 34609 on any airplane. (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 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. (e) The actions shall be done in accordance with Raytheon Service Bulletin SB.35-46, dated September 30, 1996. 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 Aircraft Company, Manager Service Engineering, 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, Small Airplane Directorate, Wichita Aircraft Certification Office, 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 November 24, 1997.