AD 92-25-04

92-25-04 BOEING: Amendment 39-8419. Docket No. 92-NM-108-AD.

Applicability: Model 737 series airplanes, as listed in Boeing Alert Service Bulletin 737- 35A1037, dated February 13, 1992, and Boeing Alert Service Bulletin 737-35A1038, dated March 19, 1992; and Model 757 series airplanes, as listed in Boeing Alert Service Bulletin 757- 35A0010, dated February 13, 1992; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent maintenance test stop plungers from interfering with proper deployment of oxygen masks, accomplish the following:

(a) For Model 737 series airplanes: Within 900 flight hours or 6 months after the effective date of this AD, whichever occurs later, accomplish the requirements of paragraphs (a)(1) and (a)(2) of this AD.

(1) Modify the test stop plungers in the oxygen box assemblies in the lavatories in accordance with Boeing Alert Service Bulletin 737-35A1037, dated February 13, 1992.(i) As an alternative action, operators may accomplish the modification of the test stop with the oxygen box assembly removed from the airplane.

(ii) In lieu of the method for reidentification of the test stop prescribed in the service bulletin, operators may use an alternative method of reidentification if it is approved by the cognizant FAA Principal Maintenance Inspector (PMI).

(2) Modify the oxygen box assemblies in modular lavatory "A" in accordance with Boeing Alert Service Bulletin 737-35A1038, dated March 19, 1992.

(b) For Model 757 series airplanes: Within 900 flight hours or 6 months after the effective date of this AD, whichever occurs later, modify the test stop plungers in the oxygen box assemblies in the lavatories and at doors 1 and 4 flight attendant seats in accordance with Boeing Alert Service Bulletin 757-35A0010, dated February 13, 1992.

(1) As an alternative action, operators may accomplish the modification of the test stop with the oxygen box assembly removed from the airplane.

(2) In lieu of the method for reidentification of the test stop prescribed in the service bulletin, operators may use an alternative method of reidentification if it is approved by the cognizant FAA Principal Maintenance Inspector (PMI).

(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, Seattle Aircraft Certification Office (ACO), 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, Seattle ACO.

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

(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(e) The modifications shall be done in accordance with Boeing Alert Service Bulletin 737-35A1037, dated February 13, 1992; Boeing Alert Service Bulletin 737-35A1038, dated March 19, 1992; or Boeing Alert Service Bulletin 757-35A0010, dated February 13, 1992; as applicable. 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. 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.

(f) This amendment becomes effective on December 23, 1992.