AD 99-05-10 Airworthiness Directives; Boeing Model 757 Series Airplanes

Models named: 757. Read the applicability below — it usually turns on serial or part numbers too.

Model 757 airplanes; equipped with ram air turbine (RAT) deployment actuators having Boeing part number (P/N) S271N102-4 (Arkwin P/N 1211233-004) or Boeing P/N S271N102-5 (Arkwin P/N 1211233-005), and having a serial number of 00001 and subsequent; 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 (d) 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 prevent the failure of the actuators used to deploy the RAT, accomplish the following: (a) Within 120 days after the effective date of this AD, revise the FAA-approved maintenance program to require verification that the shipping container and shipping sleeve assembly, as specified in Arkwin Industries Service Bulletin 1211233-29-21-4, Revision 3, dated February 7, 1997, was used in shipping the actuator to a location where it is to be installed. Note 2: Once the maintenance program has been revised to include the procedures specified in this paragraph, operators are not required to subsequently record accomplishment each time that an actuator is shipped. (b) Within 30 months after the effective date of this AD, perform an inspection of the identification plate on the deployment actuator of the RAT to determine the actuator serial numbers in accordance with Arkwin Industries Service Bulletin 1211233-29-21-3, Revision 2, dated June 17, 1994, or Revision 3, dated February 7, 1997; or perform a records check of the same area to determine the actuator serial numbers. (1) If the actuator bears Boeing P/N S271N102-4 (Arkwin P/N 1211233-004) or Boeing P/N S271N102-5 (Arkwin P/N 1211233-005), and has a serial number of 00001 through 00631 inclusive (with no ``B'' suffix): Prior to further flight, remove the RAT deployment actuator and repair or replace it, in accordance with the Arkwin Industries service bulletins previously referenced in paragraph (b) of this AD or in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Note 3: Arkwin Industries Service Bulletin 1211233-29-21-3, Revision 2, dated June 17, 1994, or Revision 3, dated February 7, 1997, recommends that the actuator unit be returned to Arkwin Industries for modification, since specialized equipment is needed to perform the rework of the unit. (2) Prior to further flight, remove the RAT deployment actuator and repair or replace it, in accordance with Arkwin Industries Service Bulletin 1211233-29-21-3, Revision 2, dated June 17, 1994, or Revision 3, dated February 7, 1997, if the actuator: (i) Has Boeing P/N S271N102-4 (Arkwin P/N 1211233-004) or Boeing P/N S271N102- 5 (Arkwin P/N 1211233-005); and (ii) Has a serial number of 00001 through 00631 inclusive, with a suffix letter ``B;'' or has a serial number of 00632 or subsequent; and (iii) Has been removed previously from an airplane and shipped in the extended position and not in accordance with Arkwin Industries Service Bulletin 1211233-29-21-4, Revision 2, dated June 17, 1994, or Revision 3, dated February 7, 1997. Note 4: Shipping records or tags may be reviewed to determine whether the actuator was shipped in accordance with Arkwin Industries Service Bulletin 1211233-29-21-4, Revision 2 or Revision 3. Note 5: Arkwin Industries Service Bulletin 1211233-29-21-4, Revision 2 or Revision 3, provides procedures for proper identification of the necessary reusable shipping container and shipping sleeve assembly that are to be used when transporting or shipping the RAT deployment actuator assembly. Use of this container and sleeve will prevent damage to the assembly during shipping. (3) No further action is required by paragraph (b) of this AD, if the actuator: (i) Has Boeing P/N S271N102-4 (Arkwin P/N 1211233-004) or Boeing P/N S271N102-5 (Arkwin P/N 1211233-005); and (ii) Has a serial number of 00001 through 00631 inclusive, with a suffix letter ``B;'' or has a serial number of 00632 or subsequent; and (iii) Has not been removed previously from an airplane, or has been removed and shipped in the extended position, in accordance with Arkwin Industries Service Bulletin 1211233-29-21-4, Revision 2, dated June 17, 1994, or Revision 3, dated February 7, 1997. (c) As of 30 months after the effective date of this AD, no person shall install on any airplane a RAT deployment actuator assembly, having Boeing P/N S271N102-4 (Arkwin P/N 1211233-004) or Boeing P/N S271N102-5 (Arkwin P/N 1211233-005), and having serial number 00001 and subsequent; unless the conditions, as specified in both paragraphs (c)(1) and (c)(2) of this AD apply: (1) The actuator assembly has been modified (repaired and reidentified) in accordance with Arkwin Industries Service Bulletin 1211233-29-21-3, Revision 2, dated June 17, 1994, or Revision 3, dated February 7, 1997; or the actuator is replaced with a new actuator from Arkwin Industries, Inc.; and (2) Prior to installation, the actuator was shipped (i.e., to the place where installation is accomplished) in accordance with Arkwin Industries Service Bulletin 1211233-29-21-4, Revision 2, dated June 17, 1994, or Revision 3, dated February 7, 1997. (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, Seattle ACO. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Seattle ACO. Note 6: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. (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) Except as provided in paragraphs (a) and (b)(1) of this AD, the actions shall be done in accordance with Arkwin Industries Service Bulletin 1211233-29-21-3, Revision 2, dated June 17, 1994, or Arkwin Industries Service Bulletin 1211233-29-21-3, Revision 3, dated February 7, 1997. Revision 2 of Arkwin Industries Service Bulletin 1211233-29-21-3 contains the following list of effective pages: ------------------------------------------------------------------------ Revision level Page No. shown on page Date shown on page ------------------------------------------------------------------------ 1-3............................ 2.............. June 17, 1994. 4, 5........................... 1.............. Dec. 20, 1993. 6.............................. Original....... July 26, 1993. ------------------------------------------------------------------------ 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 Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124-2207. 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 April 9, 1999. Issued in Renton, Washington, on February 23, 1999. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-5040 Filed 3-4-99; 8:45 am] BILLING CODE 4910-13-P