AD 93-05-08

93-05-08 BOEING: Amendment 39-8513. Docket 92-NM-146-AD.

Applicability: Model 757 series airplanes, as listed in Boeing Alert Service Bulletin 757- 26A0028, Revision 1, dated April 23, 1992; and Model 767 series airplanes, as listed in Boeing Alert Service Bulletin 767-26A0081, dated February 13, 1992; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent reduced sensitivity of the smoke detector, accomplish the following:

(a) Within 24 months after the effective date of this AD, examine the smoke detectors in the cargo compartment and equipment cooling systems to determine if the correct caution decal is installed, in accordance with Autronics Service Bulletin 2156204A-26-02, dated January 17, 1992.

(1) If the caution decal is incorrect, prior to further flight, apply a correct caution decal over the existing decal and inspect the lamp inside the smoke detector to determine its part number, in accordance with the Autronics Service Bulletin.

(2) If an incorrect lamp is installed, prior to further flight, replace it with one having the correct part number, in accordance with the Autronics Service Bulletin.

NOTE: Boeing Alert Service Bulletin 757-26A0028, Revision 1, dated April 23, 1992; and Boeing Alert Service Bulletin 767-26A0081, dated February 13, 1992; describe procedures for gaining access to the smoke detectors in the cargo compartment and equipment cooling systems.

(b) If it is necessary to remove any smoke detector during the inspection required by paragraph (a) of this AD, immediately after reinstalling the smoke detector, perform a functional test in accordance with Boeing Alert Service Bulletin 757-26A0028, Revision 1, dated April 23, 1992; or Boeing Alert Service Bulletin 767-26A0081, dated February 13, 1992; as applicable.

(c) Replacement of a smoke detector with a smoke detector that has been inspected previously in accordance with Autronics Service Bulletin 2156204A-26-02, dated January 17, 1992, constitutes terminating action for the requirements of paragraph (a) of this AD, for that smoke detector. However, the functional test required by paragraph (b) of this AD must be accomplished.

(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 Aircraft Certification Office (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: 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 FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(f) The inspection and replacementrequirements shall be done in accordance with Autronics Service Bulletin 2156204A-26-02, dated January 17, 1992. The functional test shall be done in accordance with Boeing Alert Service Bulletin 757-26A0028, Revision 1, dated April 23, 1992; or Boeing Alert Service Bulletin 767-26A0081, 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; or from Autronics Corporation, 314 East Live Oak Avenue, Arcadia, California 91006-5617. 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 29, 1993.