AD 97-25-13 Airworthiness Directives; British Aerospace BAe Model ATP Airplanes and Model HS 748 Series Airplanes

Models named: ATP, HS 748 series. Read the applicability below — it usually turns on serial or part numbers too.

BAe Model ATP airplanes having constructor's numbers 2002 through 2063 inclusive; and all Model HS 748 series airplanes; 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 (b) 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.

Required as indicated, unless accomplished previously. To detect and correct corrosion of the cylinder tube of the main hydraulic accumulator, which could result in loss of certain hydraulic system functions that are essential for safe operation of the airplane, accomplish the following: (a) Within 30 days after the effective date of this AD, perform an inspection of the main hydraulic accumulator for corrosion, in accordance with British Aerospace Service Bulletin ATP-29-15, or HS748-29-49, both dated February 25, 1997; as applicable. If any discrepancy is found, prior to further flight, accomplish the applicable corrective actions specified in the service bulletins. (b) 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, International Branch, ANM-116, FAA, Transport 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, International Branch, ANM-116. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the International Branch, ANM-116. (c) Special flight permits may be issued in accordance with Secs. 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. (d) The actions shall be done in accordance with British Aerospace Service Bulletin ATP-29-15, dated February 25, 1997, and British Aerospace Service Bulletin HS748-29-49, dated February 25, 1997. 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 AI(R) American Support, Inc., 13850 Mclearen Road, Herndon, Virginia 20171. 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. Note 3: The subject of this AD is addressed in British airworthiness directives 004-02-97, dated February 25, 1997, and 005-02-97, dated February 7, 1997. (e) This amendment becomes effective on January 14, 1998. Issued in Renton, Washington, on December 2, 1997. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 97-32121 Filed 12-9-97; 8:45 am] BILLING CODE 4910-13-U